Two-dimensional transition metal dichalcogenides(2D TMDs)are promising as sensing materials for flexible electronics and wearable systems in artificial intelligence,tele-medicine,and internet of things(IoT).Currently,...Two-dimensional transition metal dichalcogenides(2D TMDs)are promising as sensing materials for flexible electronics and wearable systems in artificial intelligence,tele-medicine,and internet of things(IoT).Currently,the study of 2D TMDs-based flexible strain sensors mainly focuses on improving the performance of sensitivity,response,detection resolution,cyclic stability,and so on.There are few reports on power consumption despite that it is of significant importance for wearable electronic systems.It is still challenging to effectively reduce the power consumption for prolonging the endurance of electronic systems.Herein,we propose a novel approach to realize ultra-low power consumption strain sensors by reducing the contact resistance between metal electrodes and 2D MoS_(2).A dendritic bilayer MoS_(2) has been designed and synthesized by a modified CVD method.Large-area edge contact has been introduced in the dendritic MoS_(2),resulting in decreased the contact resistance significantly.The contact resistance can be down to 5.4 kΩμm,which is two orders of magnitude lower than the conventional MoS_(2) devices.We fabricate a flexible strain sensor,exhibiting superior sensitivity in detecting strains with high resolution(0.04%)and an ultra-low power consumption(33.0 pW).This study paves the way for future wearable and flexible sensing electronics with high sensitivity and ultra-low power consumption.展开更多
The olfactory sensory system of Drosophila has several advantages,including low power consumption,high rapidity and high accuracy.Here,we present a biomimetic intelligent olfactory sensing system based on the integrat...The olfactory sensory system of Drosophila has several advantages,including low power consumption,high rapidity and high accuracy.Here,we present a biomimetic intelligent olfactory sensing system based on the integration of an 18-channel microelectromechanical system(MEMS)sensor array(16 gas sensors,1 humidity sensor and 1 temperature sensor),a complementary metal-oxide-semiconductor(CMOS)circuit and an olfactory lightweight machine-learning algorithm inspired by Drosophila.This system is an artificial version of the biological olfactory perception system with the capabilities of environmental sensing,multi-signal processing,and odor recognition.The olfactory data are processed and reconstructed by the combination of a shallow neural network and a residual neural network,with the aim to determine the noxious gas information in challenging environments such as high humidity scenarios and partially damaged sensor units.As a result,our electronic olfactory sensing system is capable of achieving comprehensive gas recognition by qualitatively identifying 7 types of gases with an accuracy of 98.5%,reducing the number of parameters and the difficulty of calculation,and quantitatively predicting each gas of 3-5 concentration gradients with an accuracy of 93.2%;thus,these results show superiority of our system in supporting alarm systems in emergency rescue scenarios.展开更多
Two-dimensional(2D)materials have great potential in the fields of flexible electronics and photoelectronic devices due to their unique properties derived by special structures.The study of the mechanical properties o...Two-dimensional(2D)materials have great potential in the fields of flexible electronics and photoelectronic devices due to their unique properties derived by special structures.The study of the mechanical properties of 2D materials plays an important role in next-generation flexible mechanical electronic device applications.Unfortunately,traditional experiment models and measurement methods are not suitable for 2D materials due to their atomically ultrathin thickness,which limits both the theoretical research and practical value of the 2D materials.In this review,we briefly summarize the characterization of mechanical properties of 2D materials by in situ probe nanoindentation experiments,and discuss the effect of thickness,grain boundary,and interlayer interactions.We introduce the strain-induced effect on electrical properties and optical properties of 2D materials.Then,we generalize the mechanical sensors based on various 2D materials and their future potential applications in flexible and wearable electronic devices.Finally,we discuss the state of the art for the mechanical properties of 2D materials and their opportunities and challenges in both basic research and practical applications.展开更多
Flexible electronics is the research field with interdisciplinary crossing and integration.It shows the promising advantages of novel device configurations,low-cost and low-power consumption due to their flexible and ...Flexible electronics is the research field with interdisciplinary crossing and integration.It shows the promising advantages of novel device configurations,low-cost and low-power consumption due to their flexible and soft characteristics.Atomic layered two-dimensional(2D)materials especially transition metal dichalcogenides,have triggered great interest in ultra-thin 2D flexible electronic devices and optoelectronic devices because of their direct and tunable bandgaps,excellent electrical,optical,mechanical,and thermal properties.This review aims to provide the recent progress in 2D TMDs and their applications in flexible electronics.The fundamental electrical properties and mechanical properties of materials,flexible device configurations,and their performance in transistors,sensors,and photodetectors are thoroughly discussed.At last,some perspectives are given on the open challenges and prospects for 2D TMDs flexible electronic devices and new device opportunities.展开更多
This paper presents an 11-bit 200MS/s subrange S AR ADC with an integrated reference buffer in 65nm CMOS.The proposed ADC employs a 3.5-bit flash ADC for coarse conversion,and a compact timing scheme at the flash/SAR ...This paper presents an 11-bit 200MS/s subrange S AR ADC with an integrated reference buffer in 65nm CMOS.The proposed ADC employs a 3.5-bit flash ADC for coarse conversion,and a compact timing scheme at the flash/SAR boundary to speed up the conversion.The flash decision is used to control charge compensating for the reference voltage to reduce its input-dependent fluctuation.Measurement results show that the fabricated ADC has achieved significant improvement by applying the reference charge compensation.In addition,the ADC achieves a maximum signal-to-noise-and-distortion ratio of 59.3dB at 200MS/s.It consumes 3.91mW from a 1.2V supply,including the reference buffer.展开更多
Flexible and wearable pressure sensors attached to human skin are effective and convenient in accurate and real-time tracking of various physiological signals for disease diagnosis and health assessment.Conventional f...Flexible and wearable pressure sensors attached to human skin are effective and convenient in accurate and real-time tracking of various physiological signals for disease diagnosis and health assessment.Conventional flexible pressure sensors are constructed using compressible dielectric or conductive layers,which are electrically sensitive to external mechanical stimulation.However,saturated deformation under large compression significantly restrains the detection range and sensitivity of such sensors.Here,we report a novel type of flexible pressure sensor to overcome the compression saturation of the sensing layer by softstrain ffect,enabling an utra-high sensitivity of~636 kPa^(-1) and a wide detection range from 0.1 kPa to 56 kPa.In addition,the cyclic loading-unloading test reveals the excellent stability of the sensor,which maintains its signal detection after 10.000 cycles of 10 kPa compression.The sensor is capable of monitoring arterial pulse waves from both deep tissue and distal parts,such as digital arteries and dorsal pedal arteries,which can be used for blood pressure estimation by pulse transit time at the same artery branch.展开更多
基金National Key Research and Development Program of China,Grant/Award Number:2020YFB2008501the Joint of the National Natural Science Foundation of China,Grant/Award Numbers:62288102,62371397,61974120+3 种基金the Natural Science Foundation of Shaanxi Province,Grant/Award Numbers:2022JQ-659,2023-JC-YB-495the Fundamental Research Funds for the Central UniversitiesNorthwestern Polytechnical UniversityOpen Test Funding Project from Analytical&Testing Center of Northwestern Polytechnical University,Grant/Award Number:2023T008。
文摘Two-dimensional transition metal dichalcogenides(2D TMDs)are promising as sensing materials for flexible electronics and wearable systems in artificial intelligence,tele-medicine,and internet of things(IoT).Currently,the study of 2D TMDs-based flexible strain sensors mainly focuses on improving the performance of sensitivity,response,detection resolution,cyclic stability,and so on.There are few reports on power consumption despite that it is of significant importance for wearable electronic systems.It is still challenging to effectively reduce the power consumption for prolonging the endurance of electronic systems.Herein,we propose a novel approach to realize ultra-low power consumption strain sensors by reducing the contact resistance between metal electrodes and 2D MoS_(2).A dendritic bilayer MoS_(2) has been designed and synthesized by a modified CVD method.Large-area edge contact has been introduced in the dendritic MoS_(2),resulting in decreased the contact resistance significantly.The contact resistance can be down to 5.4 kΩμm,which is two orders of magnitude lower than the conventional MoS_(2) devices.We fabricate a flexible strain sensor,exhibiting superior sensitivity in detecting strains with high resolution(0.04%)and an ultra-low power consumption(33.0 pW).This study paves the way for future wearable and flexible sensing electronics with high sensitivity and ultra-low power consumption.
基金This work was supported by the National Science and Technology Major Project from the Minister of Science and Technology of China(Grant No.2018AAA0103100)National Natural Science Foundation of China(Grant n0.62236005)+5 种基金Fund of Youth Innovation Promotion Association CAS(Grant no.2022234)Key-Area Research and Development Program of Guangdong Province(Grant no.2021B0909060002)Key Research Program of Frontier Sciences,CAS(Grant no.ZDBS-LY-JSCo24)Shanghai Pilot Program for Basic Research-Chinese Academy of Science,Shanghai Branch(Grant no.JCYJSHFY-2022-01)Jiangxi Province 03 Special Project and 5G Project(Grant no.20212ABC03W07)Fund for Central Government in Guidance of Local Science and Technology Development(Grant no.20201ZDE04013).
文摘The olfactory sensory system of Drosophila has several advantages,including low power consumption,high rapidity and high accuracy.Here,we present a biomimetic intelligent olfactory sensing system based on the integration of an 18-channel microelectromechanical system(MEMS)sensor array(16 gas sensors,1 humidity sensor and 1 temperature sensor),a complementary metal-oxide-semiconductor(CMOS)circuit and an olfactory lightweight machine-learning algorithm inspired by Drosophila.This system is an artificial version of the biological olfactory perception system with the capabilities of environmental sensing,multi-signal processing,and odor recognition.The olfactory data are processed and reconstructed by the combination of a shallow neural network and a residual neural network,with the aim to determine the noxious gas information in challenging environments such as high humidity scenarios and partially damaged sensor units.As a result,our electronic olfactory sensing system is capable of achieving comprehensive gas recognition by qualitatively identifying 7 types of gases with an accuracy of 98.5%,reducing the number of parameters and the difficulty of calculation,and quantitatively predicting each gas of 3-5 concentration gradients with an accuracy of 93.2%;thus,these results show superiority of our system in supporting alarm systems in emergency rescue scenarios.
基金Fundamental Research Funds for the Central Universities,Grant/Award Numbers:31020190QD010,3102019PY004,3102019JC004Ministry of Education-Singapore,Grant/Award Numbers:MOE2015-T2-2-043,MOE2017-T2-2-136,Tier 1 RG7/18+2 种基金National Natural Science Foundation of China,Grant/Award Number:11904289Natural Science Foundation of Shaanxi Province,Grant/Award Number:2019JQ-613Start-up funds from Northwestern Polytechnical University,Grant/Award Numbers:19SH020159,19SH020123。
文摘Two-dimensional(2D)materials have great potential in the fields of flexible electronics and photoelectronic devices due to their unique properties derived by special structures.The study of the mechanical properties of 2D materials plays an important role in next-generation flexible mechanical electronic device applications.Unfortunately,traditional experiment models and measurement methods are not suitable for 2D materials due to their atomically ultrathin thickness,which limits both the theoretical research and practical value of the 2D materials.In this review,we briefly summarize the characterization of mechanical properties of 2D materials by in situ probe nanoindentation experiments,and discuss the effect of thickness,grain boundary,and interlayer interactions.We introduce the strain-induced effect on electrical properties and optical properties of 2D materials.Then,we generalize the mechanical sensors based on various 2D materials and their future potential applications in flexible and wearable electronic devices.Finally,we discuss the state of the art for the mechanical properties of 2D materials and their opportunities and challenges in both basic research and practical applications.
基金the National Key Research and Development Program of China(No.2020YFB2008501)the National Natural Science Foundation of China(No.11904289)+3 种基金the Key Research and Development Program of Shaanxi Province(Nos.2020ZDLGY04-08,and 2020GXLH-Z-027)the Natural Science Foundation of Ningbo(No.202003N4003)the Fundamental Research Funds for the Central Universities(Nos.3102019PY004,31020190QD010,and 3102019JC004)from Northwestern Polytechnical University.
文摘Flexible electronics is the research field with interdisciplinary crossing and integration.It shows the promising advantages of novel device configurations,low-cost and low-power consumption due to their flexible and soft characteristics.Atomic layered two-dimensional(2D)materials especially transition metal dichalcogenides,have triggered great interest in ultra-thin 2D flexible electronic devices and optoelectronic devices because of their direct and tunable bandgaps,excellent electrical,optical,mechanical,and thermal properties.This review aims to provide the recent progress in 2D TMDs and their applications in flexible electronics.The fundamental electrical properties and mechanical properties of materials,flexible device configurations,and their performance in transistors,sensors,and photodetectors are thoroughly discussed.At last,some perspectives are given on the open challenges and prospects for 2D TMDs flexible electronic devices and new device opportunities.
基金supported by the Zhongxing Telecommunication Equipment CorporationBeijing Microelectronics Technology Institute
文摘This paper presents an 11-bit 200MS/s subrange S AR ADC with an integrated reference buffer in 65nm CMOS.The proposed ADC employs a 3.5-bit flash ADC for coarse conversion,and a compact timing scheme at the flash/SAR boundary to speed up the conversion.The flash decision is used to control charge compensating for the reference voltage to reduce its input-dependent fluctuation.Measurement results show that the fabricated ADC has achieved significant improvement by applying the reference charge compensation.In addition,the ADC achieves a maximum signal-to-noise-and-distortion ratio of 59.3dB at 200MS/s.It consumes 3.91mW from a 1.2V supply,including the reference buffer.
基金supported by the National Key Research and Development Program of China(2020YFB2008501)the National Natural Science Foundation of China(11904289)+3 种基金Key Research and Development Program of Shaanxi Province(2020ZDLGY04-08 and 2020GXLH-Z-027)the Ningbo Natural Science Foundation(202003N4003)the Fundamental Research Funds forthe Central Universities(3102019PY004,31020190QD010,and 3102019JC004)start-up funds from Northwestern Polytechnical University(19SH020159 and 20GH020140).
文摘Flexible and wearable pressure sensors attached to human skin are effective and convenient in accurate and real-time tracking of various physiological signals for disease diagnosis and health assessment.Conventional flexible pressure sensors are constructed using compressible dielectric or conductive layers,which are electrically sensitive to external mechanical stimulation.However,saturated deformation under large compression significantly restrains the detection range and sensitivity of such sensors.Here,we report a novel type of flexible pressure sensor to overcome the compression saturation of the sensing layer by softstrain ffect,enabling an utra-high sensitivity of~636 kPa^(-1) and a wide detection range from 0.1 kPa to 56 kPa.In addition,the cyclic loading-unloading test reveals the excellent stability of the sensor,which maintains its signal detection after 10.000 cycles of 10 kPa compression.The sensor is capable of monitoring arterial pulse waves from both deep tissue and distal parts,such as digital arteries and dorsal pedal arteries,which can be used for blood pressure estimation by pulse transit time at the same artery branch.
