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Boosting the Energy Density Through In Situ Thermal Gelation of Polymer Electrolyte with Lithium-Graphite Composite Anode
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作者 Chea-Yun Kang Rae-Hyun Lee +3 位作者 Jong-Kyu Lee Kyong-Nam Kim Jung-Rag Yoon Seung-Hwan Lee 《Energy & Environmental Materials》 2025年第4期40-50,共11页
We have entered the age of renewable energy revolution.Hence,energy-dense all-solid-state lithium metal batteries are now being actively researched as one of the most promising energy storage systems.However,they have... We have entered the age of renewable energy revolution.Hence,energy-dense all-solid-state lithium metal batteries are now being actively researched as one of the most promising energy storage systems.However,they have not yet been a silver bullet due to the dendrite formation and interfacial issue.Here,we introduce the hybrid polymer electrolyte via a novel solvent-free strategy as well as utilize a polymerization and gelation effect of cyanoethyl polyvinyl alcohol to achieve superior electrochemical performance.The hybrid polymer electrolyte,using cyanoethyl polyvinyl alcohol,demonstrates a stable artificial solid electrolyte interface layer,which suppresses the continuous decomposition of Li salts.Importantly,we also present the lithium-graphite composite anode to reach the super-highenergy-density anode materials.Taken together,these advancements represent a significant stride toward addressing the challenges associated with all-solid-state lithium metal batteries. 展开更多
关键词 all-solid-state lithium batteries flexible 3D framework in-situ thermal gelation lithium-graphite hybrid anode solvent free
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Enhanced Structure/Interfacial Properties of Single-Crystal Ni-Rich LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2)Cathodes Synthesized Via LiCl-NaCl Molten-Salt Method
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作者 Ye-Wan Yoo Chea-Yun Kang +5 位作者 Hyun-Kyung Kim Jong-Kyu Lee Ramachandran Vasant Kumar Kyong-Nam Kim Jung-Rag Yoon Seung-Hwan Lee 《Energy & Environmental Materials》 2025年第1期58-69,共12页
Arising from the increasing demand for electric vehicles(EVs),Ni-rich LiNi_(x)Co_(y)Mn_(z)O_(2)(NCM,x+y+z=1,x≥0.8)cathode with greatly increased energy density are being researched and commercialized for lithium-ion ... Arising from the increasing demand for electric vehicles(EVs),Ni-rich LiNi_(x)Co_(y)Mn_(z)O_(2)(NCM,x+y+z=1,x≥0.8)cathode with greatly increased energy density are being researched and commercialized for lithium-ion batteries(LIBs).However,parasitic crack formation during the discharge–charge cycling process remains as a major degradation mechanism.Cracking leads to increase in the specific surface area,loss of electrical contact between the primary particles,and facilitates liquid electrolyte infiltration into the cathode active material,accelerating capacity fading and decrease in lifetime.In contrast,Ni-rich NCM when used as a single crystal exhibits superior cycling performances due to its rigid mechanical property that resists cracking during long charge–discharge process even under harsh conditions.In this paper,we present comparative investigation between single crystal Ni-rich LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2)(SC)and polycrystalline Ni-rich LiNi_(0.92)Co_(0.04)Mn_(0.04)O_(2)(PC).The relatively improved cycling performances of SC are attributed to smaller anisotropic volume change,higher reversibility of phase transition,and resistance to crack formation.The superior properties of SC are demonstrated by in situ characterization and battery tests.Consequently,it is inferred from the results obtained that optimization of preparation conditions can be regarded as a key approach to obtain well crystallized and superior electrochemical performances. 展开更多
关键词 cathode materials lithium-ion batteries Ni-rich layered oxide single crystal transition metal ions
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Mesoporous WO_(3)-Dot-Decorated Flexible Electrodes for the Determination of Industrial Pollutants
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作者 Aneesh Koyappayil Hyunho Seok +12 位作者 Gwan Hyun Choi Sachin Chavan Sangho Yeon Sihoon Son Anna Go Jinhyoung Lee Keon-Woo Kim Dongho Lee Hyun-Bin Choi Hyeong-U Kim Jin Kon Kim Taesung Kim Min-Ho Lee 《Energy & Environmental Materials》 2025年第2期273-283,共11页
This study demonstrates the fabrication of mesoporous tungsten trioxide(WO_(3))-decorated flexible polyimide(PI)electrodes for the highly sensitive detection of catechol(CC)and hydroquinone(HQ),two environmental pollu... This study demonstrates the fabrication of mesoporous tungsten trioxide(WO_(3))-decorated flexible polyimide(PI)electrodes for the highly sensitive detection of catechol(CC)and hydroquinone(HQ),two environmental pollutants.Organic-inorganic composite dots are formed on flexible PI electrodes using evaporation-induced self-assembly(EISA)and electrospray methods.The EISA process is induced by a temperature gradient during electrospray,and the heated substrate partially decomposes the organic parts etched by O_(2) plasma,creating mesoporous structures.Differential pulse voltammetry and cyclic voltammetry demonstrate a linear correlation between analyte concentration and the electrochemical response.Computational studies support the spontaneous adsorption of CC and HQ molecules on model WO_(3) surfaces.The proposed sensor shows high sensitivity,a wide linear range,and a low detection limit for both individual and simultaneous determination of CC and HQ.Real sample analysis on river water confirms practical applicability.The WO_(3)-decorated PI electrode presents an efficient and reliable approach for detecting these pollutants,contributing to environmental safety measures. 展开更多
关键词 CATECHOL flexible sensor HYDROQUINONE mesoporousWO_(3) simultaneous determination
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Exploring Nanoscale Perovskite Materials for Next‑Generation Photodetectors:A Comprehensive Review and Future Directions 被引量:2
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作者 Xin Li Sikandar Aftab +4 位作者 Maria Mukhtar Fahmid Kabir Muhammad Farooq Khan Hosameldin Helmy Hegazy Erdi Akman 《Nano-Micro Letters》 SCIE EI CAS 2025年第2期46-108,共63页
The rapid advancement of nanotechnology has sparked much interest in applying nanoscale perovskite materials for photodetection applications.These materials are promising candidates for next-generation photodetectors(... The rapid advancement of nanotechnology has sparked much interest in applying nanoscale perovskite materials for photodetection applications.These materials are promising candidates for next-generation photodetectors(PDs)due to their unique optoelectronic properties and flexible synthesis routes.This review explores the approaches used in the development and use of optoelectronic devices made of different nanoscale perovskite architectures,including quantum dots,nanosheets,nanorods,nanowires,and nanocrystals.Through a thorough analysis of recent literature,the review also addresses common issues like the mechanisms underlying the degradation of perovskite PDs and offers perspectives on potential solutions to improve stability and scalability that impede widespread implementation.In addition,it highlights that photodetection encompasses the detection of light fields in dimensions other than light intensity and suggests potential avenues for future research to overcome these obstacles and fully realize the potential of nanoscale perovskite materials in state-of-the-art photodetection systems.This review provides a comprehensive overview of nanoscale perovskite PDs and guides future research efforts towards improved performance and wider applicability,making it a valuable resource for researchers. 展开更多
关键词 Nanoscale perovskites PHOTODETECTORS NANOSHEETS NANORODS NANOWIRES Quantum dots NANOCRYSTALS
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RGB Color-Discriminable Photonic Synapse for Neuromorphic Vision System
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作者 Bum Ho Jeong Jaewon Lee +6 位作者 Miju Ku Jongmin Lee Dohyung Kim Seokhyun Ham Kyu-Tae Lee Young-Beom Kim Hui Joon Park 《Nano-Micro Letters》 2025年第4期39-62,共24页
To emulate the functionality of the human retina and achieve a neuromorphic visual system,the development of a photonic synapse capable of multispectral color discrimination is of paramount importance.However,attainin... To emulate the functionality of the human retina and achieve a neuromorphic visual system,the development of a photonic synapse capable of multispectral color discrimination is of paramount importance.However,attaining robust color discrimination across a wide intensity range,even irrespective of medium limitations in the channel layer,poses a significant challenge.Here,we propose an approach that can bestow the color-discriminating synaptic functionality upon a three-terminal transistor flash memory even with enhanced discriminating capabilities.By incorporating the strong induced dipole moment effect at the excitation,modulated by the wavelength of the incident light,into the floating gate,we achieve outstanding RGB color-discriminating synaptic functionality within a remarkable intensity range spanning from 0.05 to 40 mW cm^(-2).This approach is not restricted to a specific medium in the channel layer,thereby enhancing its applicability.The effectiveness of this color-discriminating synaptic functionality is demonstrated through visual pre-processing of a photonic synapse array,involving the differentiation of RGB channels and the enhancement of image contrast with noise reduction.Consequently,a convolutional neural network can achieve an impressive inference accuracy of over 94%for Canadian-Institute-For-Advanced-Research-10 colorful image recognition task after the pre-processing.Our proposed approach offers a promising solution for achieving robust and versatile RGB color discrimination in photonic synapses,enabling significant advancements in artificial visual systems. 展开更多
关键词 Organic field-effect transistor Photonic synapse Excited-state dipole moment RGB color discrimination Neuromorphic visual system
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Advanced approaches to decoupled sensory signal monitoring in human interface systems
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作者 Se Gi Lee Ki Jun Yu +1 位作者 Sang Min Won Jae-Young Yoo 《International Journal of Extreme Manufacturing》 2025年第4期56-76,共21页
Real-time sensory signal monitoring systems are crucial for continuous health tracking and enhancing human-interface technologies in virtual reality/augmented reality applications.Recent advancements in micro/nanofabr... Real-time sensory signal monitoring systems are crucial for continuous health tracking and enhancing human-interface technologies in virtual reality/augmented reality applications.Recent advancements in micro/nanofabrication technologies have enabled wearable and implantable sensors to achieve sufficient sensitivity for measuring subtle sensory signals,while integration with wireless communication technologies allows for real-time monitoring and closed-loop user feedback.However,highly sensitive sensing materials face challenges,as their detection results can easily be altered by external factors such as bending,temperature,and humidity.This review discusses methods for decoupling various stimuli and their applications in human interfaces.We cover the latest advancements in decoupled systems,including the design of sensing materials using micro/nanostructured materials,3-dimensional(3D)sensory system architectures,and Artificial intelligence(AI)-based signal decoupling processing techniques.Additionally,we highlight key applications in robotics,wearable,and implantable health monitoring made possible by these decoupled systems.Finally,we suggest future research directions to address the remaining challenges of developing decoupled artificial sensory systems that are resilient to external stimuli. 展开更多
关键词 decoupled sensory systems micro/nanostructured material 3D sensory system architectures AI-based signal decoupling
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High-performance piezocatalytic hydrogen evolution over bismuth oxyhalides with halogen-dependent piezoelectricity and surface activity
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作者 Hao-Ran Li Yu-Ming Chen +5 位作者 Cheng-Chao Jin Ai-Ze Hao Shania Rehmand Bing-Bing Chen Fei Wang Dai-Ming Liu 《Rare Metals》 2025年第8期5475-5485,共11页
The piezocatalytic characteristic of bismuth oxyhalides(BiOX,X=Cl,Br,and I) has been increasingly capturing interest for its potential in hydrogen evolution reaction(HER) through water splitting process.The performanc... The piezocatalytic characteristic of bismuth oxyhalides(BiOX,X=Cl,Br,and I) has been increasingly capturing interest for its potential in hydrogen evolution reaction(HER) through water splitting process.The performance regarding these piezocatalysts is closely related to the halogen element present in BiOX;yet,the specific influence mechanisms remain unclear.In this study,we prepared BiOX catalysts via a hydrothermal process and explored their piezocatalytic HER activities.Owing to the layered bismuth s tructure,the resulting sheet-like piezocatalysts can efficiently capture the mechanic stimulus and allow the robust piezoelectric field,contributing to the piezocatalytic operation.It demonstrates that the BiOBr achieves a remarkable piezocatalytic HER efficiency of 813 μmol g^(-1)h^(-1),outperforming BiOCl and BiOI.The density functional theory(DFT)calculation results reveal that the BiOBr with moderate halogen atom size and lattice layer spacing possesses the strongest piezoelectricity,which enhances the separation and transfer of electron-hole pairs.Meanwhile,the exposed Br atom layer facilitates a large Bader charge and a low surface Gibbs free energy(ΔG_(H)),enhancing charge transfer for hydrogen reduction at the solid-liquid surface,thereby increasing the HER efficiency.This research sheds light on the halogen-dependent piezocatalytic activity of BiOX catalysts,offering valuable insights for the development of high-performance piezocatalysts. 展开更多
关键词 Bismuth oxyhalide HALOGEN Piezocatalysis HER Hydrogen energy
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Radiation hardness of 1.2 kV SiC power devices with advanced edge termination structures under proton irradiation
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作者 Sangyeob Kim Jeongtae Kim +3 位作者 Dong-Seok Kim Hyuncheol Bae Min-Woo Ha Ogyun Seok 《Journal of Semiconductors》 2026年第1期83-89,共7页
This work presents a systematic analysis of proton-induced total ionizing dose(TID)effects in 1.2 k V silicon carbide(SiC)power devices with various edge termination structures.Three edge terminations including ring-a... This work presents a systematic analysis of proton-induced total ionizing dose(TID)effects in 1.2 k V silicon carbide(SiC)power devices with various edge termination structures.Three edge terminations including ring-assisted junction termination extension(RA-JTE),multiple floating zone JTE(MFZ-JTE),and field limiting rings(FLR)were fabricated and irradiated with45 Me V protons at fluences ranging from 1×10^(12) to 1×10^(14) cm^(-2).Experimental results,supported by TCAD simulations,show that the RA-JTE structure maintained stable breakdown performance with less than 1%variation due to its effective electric field redistribution by multiple P+rings.In contrast,MFZ-JTE and FLR exhibit breakdown voltage shifts of 6.1%and 15.2%,respectively,under the highest fluence.These results demonstrate the superior radiation tolerance of the RA-JTE structure under TID conditions and provide practical design guidance for radiation-hardened Si C power devices in space and other highradiation environments. 展开更多
关键词 SiC proton irradiation edge termination radiation hardness TID effects
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Tunneling via surface dislocation in W/β-Ga_(2)O_(3)Schottky barrier diodes
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作者 Madani Labed Ji Young Min +4 位作者 Amina Ben Slim Nouredine Sengouga Chowdam Venkata Prasad Sinsu Kyoung You Seung Rim 《Journal of Semiconductors》 EI CAS CSCD 2023年第7期23-27,共5页
In this work,W/β-Ga_(2)O_(3)Schottky barrier diodes,prepared using a confined magnetic field-based sputtering method,were analyzed at different operation temperatures.Firstly,Schottky barrier height increased with in... In this work,W/β-Ga_(2)O_(3)Schottky barrier diodes,prepared using a confined magnetic field-based sputtering method,were analyzed at different operation temperatures.Firstly,Schottky barrier height increased with increasing temperature from 100 to 300 K and reached 1.03 eV at room temperature.The ideality factor decreased with increasing temperature and it was higher than 2 at 100 K.This apparent high value was related to the tunneling effect.Secondly,the series and on-resistances decreased with increasing operation temperature.Finally,the interfacial dislocation was extracted from the tunneling current.A high dislocation density was found,which indicates the domination of tunneling through dislocation in the transport mecha-nism.These findings are evidently helpful in designing better performance devices. 展开更多
关键词 β-Ga_(2)O_(3) SBD SBD paramatters TUNGSTEN low temperature tunneling via dislocation
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M_(4)X_(3) MXenes:Application in Energy Storage Devices
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作者 Iftikhar Hussain Waqas Ul Arifeen +11 位作者 Shahid Ali Khan Sikandar Aftab Muhammad Sufyan Javed Sajjad Hussain Muhammad Ahmad Xi Chen Jiyun Zhao PRosaiah Khaled Fahmi Fawy Adnan Younis Sumanta Sahoo Kaili Zhang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第10期522-542,共21页
MXene has garnered widespread recognition in the scientific com-munity due to its remarkable properties,including excellent thermal stability,high conductivity,good hydrophilicity and dispersibility,easy processabilit... MXene has garnered widespread recognition in the scientific com-munity due to its remarkable properties,including excellent thermal stability,high conductivity,good hydrophilicity and dispersibility,easy processability,tunable surface properties,and admirable flexibility.MXenes have been categorized into different families based on the number of M and X layers in M_(n+1)X_(n),such as M_(2)X,M_(3)X_(2),M_(4)X_(3),and,recently,M_(5)X_(4).Among these families,M_(2)X and M_(3)X_(2),par-ticularly Ti_(3)C_(2),have been greatly explored while limited studies have been given to M_(5)X_(4)MXene synthesis.Meanwhile,studies on the M_(4)X_(3)MXene family have developed recently,hence,demanding a compilation of evaluated studies.Herein,this review provides a systematic overview of the latest advancements in M_(4)X_(3)MXenes,focusing on their properties and applications in energy storage devices.The objective of this review is to provide guidance to researchers on fostering M_(4)X_(3)MXene-based nanomaterials,not only for energy storage devices but also for broader applications. 展开更多
关键词 MXene M_(4)X_(3)MXenes 2D materials Energy storage PROPERTIES
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Deep learning-developed multi-light source discrimination capability of stretchable capacitive photodetector
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作者 Su Bin Choi Jun Sang Choi +3 位作者 Hyun Sik Shin Jeong-Won Yoon Youngmin Kim Jong-Woong Kim 《npj Flexible Electronics》 2025年第1期1407-1419,共13页
We introduce a novel stretchable photodetector with enhanced multi-light source detection,capable of discriminating light sources using artificial intelligence(AI).These features highlight the application potential of... We introduce a novel stretchable photodetector with enhanced multi-light source detection,capable of discriminating light sources using artificial intelligence(AI).These features highlight the application potential of deep learning enhanced photodetectors in applications that require accurate for visual light communication(VLC).Experimental results showcased its excellent potential in real-world traffic system.This photodetector,fabricated using a composite structure of silver nanowires(AgNWs)/zinc sulfide(ZnS)-polyurethane acrylate(PUA)/AgNWs,maintained stable performance under 25%tensile strain and 2 mm bending radius.It shows high sensitivity at both 448 and 505 nm wavelengths,detecting light sources under mechanical deformations,different wavelengths and frequencies.By integrating a one-dimensional convolutional neural network(1D-CNN)model,we classified the light source power level with 96.52%accuracy even the light of two wavelengths is mixed.The model’s performance remains consistent across flat,bent,and stretched states,setting a precedent for flexible electronics combined with AI in dynamic environments. 展开更多
关键词 visual light communication vlc experimental deep learning silver nanowires agnws zinc artificial intelligence ai stretchable photodetector composite structure multi light source discrimination discriminating light sources
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Rise of intrinsically stretchable electroluminescent materials:toward free-form displays
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作者 Dong Chan Kim Moon Kee Choi +1 位作者 Dae-Hyeong Kim Jiwoong Yang 《npj Flexible Electronics》 2025年第1期1319-1327,共9页
Intrinsically stretchable light-emitting diodes(LEDs)are foundational components for next-generation free-form displays.Here,we present recent advances in electroluminescent materials for intrinsically stretchable LED... Intrinsically stretchable light-emitting diodes(LEDs)are foundational components for next-generation free-form displays.Here,we present recent advances in electroluminescent materials for intrinsically stretchable LEDs,including molecular plasticizer-light-emitting polymer blends,elastomer-lightemitting polymer integration,thermally activated delayed fluorescence polymers,and inorganic semiconductor nanocrystals-elastomer composites.Critical challenges—improving luminous efficiency,stability,patterning,and developing stretchable electrodes and transport layers—are discussed,providing clear pathways toward practical applications. 展开更多
关键词 activated delayed transport layers electroluminescent materials thermally activated delayed fluorescence polymers inorganic semiconductor nanocrystals elastomer composites electroluminescent polymers stretchable electrodes free form displays
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High momentum two-dimensional propagation of emitted photoluminescence coupled with surface lattice resonance
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作者 Yeonjeong Koo Dong Kyo Oh +11 位作者 Jungho Mun Artem N.Abramov Mikhail Tyugaev Yong Bin Kim Inki Kim Tae Ho Kim Sera Yang Yeseul Kim Jonghwan Kim Vasily Kravtsov Junsuk Rho Kyoung-Duck Park 《Light: Science & Applications》 2025年第8期2263-2271,共9页
Dramatic fluorescence enhancement in two-dimensional(2D)van der Waals materials(vdWMs)coupled to plasmonic nanostructures has the potential to enable ultrathin,flexible,and high-brightness illumination devices.However... Dramatic fluorescence enhancement in two-dimensional(2D)van der Waals materials(vdWMs)coupled to plasmonic nanostructures has the potential to enable ultrathin,flexible,and high-brightness illumination devices.However,addressing the limitation of locally scattered small plasmon-enhanced areas remains challenging.Here,we present a 2D plasmonic enhancement of photoluminescence(PL)spanning nearly 800μm^(2),enabled by surface lattice resonance(SLR)in a 2D vdWM-Au slot lattice hybrid.The Au slot lattice is designed and fabricated using Babinet’s principle and Rayleigh’s anomaly to maximize radiative decay rate and induce non-local photo-excitation in a MoSe_(2)monolayer.For emitted PL coupled with SLR,enhanced by up to 32-fold,we investigate its in-plane directivity and long-range propagation using angle-and space-resolved spectroscopic PL measurements.Our experiment reveals that a nearly 800μm^(2)2D luminescent sheet can be achieved regardless of the size of the MoSe_(2)crystal,even with a sub-μm^(2)flake.This work provides a new type of ultrabright,large-area 2D luminescent material,suitable for a range of optical illumination,communication,and sensing devices. 展开更多
关键词 PHOTOLUMINESCENCE surface lattice resonance d plasmonic enhancement photoluminescence pl spanning au slot lattice surface lattice resonance slr plasmonic nanostructures fluorescence enhancement two dimensional materials
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Highly Transparent and Flexible All-Nanofiber-Based Piezocomposite Containing BaTiO_(3)-Embedded P(VDF-TrFE)Nanofibers for Harvesting and Monitoring Human Kinetic Movements
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作者 Kiyong Kim Daekyu Choi +5 位作者 Sangmin Ji Freddy Baltazar Iniguez Young Jae Song Sam S.Yoon Junki Kim Seongpil An 《Advanced Fiber Materials》 SCIE EI CAS 2024年第5期1369-1386,共18页
We developed kinetic energy-harvestable and kinetic movement-detectable piezoelectric nanogenerators(PENGs)consisting of piezoelectric nanofiber(NF)mats and metal-electroplated microfiber(MF)electrodes using electrosp... We developed kinetic energy-harvestable and kinetic movement-detectable piezoelectric nanogenerators(PENGs)consisting of piezoelectric nanofiber(NF)mats and metal-electroplated microfiber(MF)electrodes using electrospinning and electroplating methods.Percolative non-woven structure and high flexibility of the NF mats and MF electrodes allowed us to achieve highly transparent and flexible piezocomposites.A viscoelastic solution,mixed with P(VDF-TrFE)and BaTiO_(3),was electrospun into piezoelectric NFs with a piezoelectric coefficient d33 of 21.2 pC/N.In addition,the combination of electrospinning and elec-troplating techniques enabled the fabrication of Ni-plated MF-based transparent conductive electrodes(TCEs),contributing to the high transparency of the resulting piezocomposite.The energy-harvesting efficiencies of the BaTiO_(3)-embedded NF-based PENGs with transmittances of 86%and 80%were 200 and 240 V/MPa,respectively,marking the highest values in their class.Moreover,the output voltage driven by the coupling effect of piezoelectricity and triboelectricity during finger tapping was 25.7 V.These highly efficient energy-harvesting performances,along with the transparent and flexible features of the PENGs,hold great promise for body-attachable energy-harvesting and sensing devices,as demonstrated in this study. 展开更多
关键词 BaTiO_(3) P(VDF-TrFE) Electrospinning All-nanofiber-based piezoelectric nanogenerator Wearable piezoelectric sensor
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Soft,full Wheatstone bridge 3D pressure sensors for cardiovascular monitoring
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作者 Yoonseok Park Haiwen Luan +16 位作者 Kyeongha Kwon Ted S.Chung Seyong Oh Jae-Young Yoo Gooyoon Chung Junha Kim Suhyeon Kim Sung Soo Kwak Junhwan Choi Hoang-Phuong Phan Seonggwang Yoo Hyoyoung Jeong Jaeho Shin Sang Min Won Hong-Joon Yoon Yei Hwan Jung John A.Rogers 《npj Flexible Electronics》 2024年第1期910-917,共8页
Variations in parameters associated with the ambient environment can introduce noise in soft,body-worn sensors.For example,many piezoresistive pressure sensors exhibit a high degree of sensitivity to fluctuations in t... Variations in parameters associated with the ambient environment can introduce noise in soft,body-worn sensors.For example,many piezoresistive pressure sensors exhibit a high degree of sensitivity to fluctuations in temperature,thereby requiring active compensation strategies.The research presented here addresses this challenge with a multilayered 3D microsystem design that integrates four piezoresistive sensors in a full-Wheatstone bridge configuration.An optimized layout of the sensors relative to the neutral mechanical plane leads to both an insensitivity to temperature and an increased sensitivity to pressure,relative to previously reported devices that rely on similar operating principles.Integrating this 3D pressure sensor into a soft,flexible electronics platform yields a system capable of real-time,wireless measurements from the surface of the skin.Placement above the radial and carotid arteries yields high-quality waveforms associated with pulsatile blood flow,with quantitative correlations to blood pressure.The results establish the materials and engineering aspects of a technology with broad potential in remote health monitoring. 展开更多
关键词 WHEAT BRIDGE thereby
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Nanoscale ultrafast camera unveils light-matter dynamics in real time and space
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作者 Jae Won Ryu Kyoung-Duck Park 《Light: Science & Applications》 2025年第8期2079-2081,共3页
Ultrafast tip-based microscopy has evolved to meet three critical parameters in optical characterization:spatial,spectral,and temporal resolution.This advancement provides deep insights into light-matter interactions ... Ultrafast tip-based microscopy has evolved to meet three critical parameters in optical characterization:spatial,spectral,and temporal resolution.This advancement provides deep insights into light-matter interactions in both real time and real space.In particular,it allows direct observation of polaritons,quantum states,and nonequilibrium dynamics,especially in low-dimensional quantum materials. 展开更多
关键词 real time NANOSCALE ultrafast camera real space spatial resolution observation polaritonsquantum light matter dynamics optical characterization spatialspectraland
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Stretchable Fabric Organic Light-Emitting Diodes Based on Transferable Laser Pattern for Wearable Photodiagnostic Applications
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作者 Ye Ji Shin Jeong Hyun Kwon +4 位作者 Tae-Yun Lee Jung-Hoon Noh Sang Jik Kwon Eou-Sik Cho Yongmin Jeon 《Advanced Fiber Materials》 2025年第3期908-925,共18页
Stretchable organic light-emitting diodes(OLEDs)are emerging as a key technology for next-generation wearable devices due to their uniform light emission,stable performance under stretching conditions,and various flex... Stretchable organic light-emitting diodes(OLEDs)are emerging as a key technology for next-generation wearable devices due to their uniform light emission,stable performance under stretching conditions,and various flexible substrates.This paper introduces stretchable OLEDs fabricated with laser-cut kirigami patterns and a multifunctional encapsulation multilayer(MEM)barrier.These OLEDs were subsequently transferred onto textiles.These stretchable OLEDs achieved a remarkable stretchability of up to 150%through optimized kirigami pattern and maintained 100%stretchability when integrated with textiles,preserving the flexibility of a textile substrate.Additionally,the MEM barrier provided ultraviolet(UV)reflection and waterproof properties,ensuring reliable performance in harsh environments.Stretchable OLEDs and stretchable fabric OLEDs demonstrated a high luminance of 18,983 cd/m^(2) and 10,205 cd/m^(2),with minimal emission variation under stretched conditions.Furthermore,the potential of stretchable fabric OLEDs for wearable healthcare applications was evaluated by measuring photoplethysmography(PPG)signals.Stable PPG signals were successfully obtained at a 20%stretched state.Adjusting light source intensity effectively compensated for signal quality degradation caused by stretching.These findings highlight the significant potential of stretchable fabric OLEDs for wearable devices and photodiagnostic platforms,offering broad applicability across diverse fields. 展开更多
关键词 STRETCHABLE Organic light-emitting diodes TEXTILE Kirigami Laser cut PHOTODIAGNOSIS
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Textile electronic systems for therapeutic applications
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作者 Byeong Woon Lee Joohoon Kang +1 位作者 Jae-Young Yoo Sang Min Won 《npj Flexible Electronics》 2025年第1期473-496,共24页
Wearable therapeutic systems must integrate with the body,operate reliably under strain,and deliver sustained stimuli.Textile-based electronics meet these needs with softness,breathability,and scalability.This review ... Wearable therapeutic systems must integrate with the body,operate reliably under strain,and deliver sustained stimuli.Textile-based electronics meet these needs with softness,breathability,and scalability.This review outlines materials,structural design,functionalization,and system integration for therapeutic e-textiles.We examine electrical,thermal,chemical,optical,and mechanical modalities across clinical uses,highlight energy solutions,and discuss challenges in durability,performance,and manufacturing needed for translation to practical,personalized therapies. 展开更多
关键词 clinical uses wearable systems structural design textile electronics wearable therapeutic systems material science FUNCTIONALIZATION therapeutic applications
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Enhancing safe driving through real-time driver monitoring using triboelectric energy harvesting and deep transfer learning
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作者 Hyunwoo Cho Quanyu He Daewon Kim 《Nano Research》 2025年第8期1010-1019,共10页
In contemporary society,personal vehicles are indispensable for enhancing everyday convenience,and numerous advanced technological solutions for safe driving are being proposed,including autonomous emergency braking s... In contemporary society,personal vehicles are indispensable for enhancing everyday convenience,and numerous advanced technological solutions for safe driving are being proposed,including autonomous emergency braking systems and lane departure warning systems.However,traditional sensors aimed at preventing incapacitated driving due to drowsiness,alcohol consumption,or sudden health issues often require additional power and may infringe upon driver privacy.A self-powered,nonintrusive motion recording system utilizing a triboelectric nanogenerator with an arch and cantilever structure(AC-TENG)as a sensor to track driver motions is introduced.Motion patterns of users are captured in real time by imaging the waveforms generated by the AC-TENG.To discern the peaks of the AC-TENG waveforms with greater precision and clarity,the roughness of the contact surface is enhanced using the reactive ion etching(RIE)technique,thereby amplifying the voltage by a factor of 2.1.The resulting output power of 2.77 mW and a corresponding power density of 3.08 W/m^(2)are demonstrated.Energy harvesting is facilitated by the proposed AC-TENG sensor,coupled with a power management integrated circuit(PMIC).Additionally,continuous wireless data transmission is enabled by using it as an input source alongside a solar cell.Motion data captured by the sensor are classified via deep transfer learning,enabling real-time monitoring of safe driving.Upon detection of any abnormal signals,the driver is promptly alerted by this system,and its application can be extended to functionalities such as transitioning the vehicle to autonomous driving mode. 展开更多
关键词 triboelectric nanogenerators power management integrated circuit deep transfer learning real-time driving monitoring automotive applications
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Highly durable and energy-efficient probabilistic bits based on h-BN/SnS_(2) interface for integer factorization
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作者 Joon-Kyu Han Jun-Young Park +3 位作者 Shania Rehman Muhammad Farooq Khan Moon-Seok Kim Sungho Kim 《InfoMat》 2025年第7期143-155,共13页
As social networks and related data processes have grown exponentially in complexity,the efficient resolution of combinatorial optimization problems has become increasingly crucial.Recent advancements in probabilistic... As social networks and related data processes have grown exponentially in complexity,the efficient resolution of combinatorial optimization problems has become increasingly crucial.Recent advancements in probabilistic computing approaches have demonstrated significant potential for addressing these problems more efficiently than conventional deterministic computing methods.In this study,we demonstrate a highly durable probabilistic bit(pbit)device utilizing two-dimensional materials,specifically hexagonal boron nitride(h-BN)and tin disulfide(SnS2)nanosheets.By leveraging the inherently stochastic nature of electron trapping and detrapping at the h-BN/SnS2 interface,the device achieves durable probabilistic fluctuations over 108 cycles with minimal energy consumption.To mitigate the static power consumption,we integrated an active switch in series with a p-bit device,replacing conventional resistors.Furthermore,employing the pulse width as the control variable for probabilistic switching significantly enhances noise immunity.We demonstrate the practical application of the proposed p-bit device in implementing invertible Boolean logic gates and subsequent integer factorization,highlighting its potential for solving complex combinatorial optimization problems and extending its applicability to real-world scenarios such as cryptographic systems. 展开更多
关键词 integer factorization interface trap invertible logic gate probabilistic bit probabilistic computing
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