The background pattern of patterned fabrics is complex,which has a great interference in the extraction of defect features.Traditional machine vision algorithms rely on artificially designed features,which are greatly...The background pattern of patterned fabrics is complex,which has a great interference in the extraction of defect features.Traditional machine vision algorithms rely on artificially designed features,which are greatly affected by background patterns and are difficult to effectively extract flaw features.Therefore,a convolutional neural network(CNN)with automatic feature extraction is proposed.On the basis of the two-stage detection model Faster R-CNN,Resnet-50 is used as the backbone network,and the problem of flaws with extreme aspect ratio is solved by improving the initialization algorithm of the prior frame aspect ratio,and the improved multi-scale model is designed to improve detection of small defects.The cascade R-CNN is introduced to improve the accuracy of defect detection,and the online hard example mining(OHEM)algorithm is used to strengthen the learning of hard samples to reduce the interference of complex backgrounds on the defect detection of patterned fabrics,and construct the focal loss as a loss function to reduce the impact of sample imbalance.In order to verify the effectiveness of the improved algorithm,a defect detection comparison experiment was set up.The experimental results show that the accuracy of the defect detection algorithm of patterned fabrics in this paper can reach 95.7%,and it can accurately locate the defect location and meet the actual needs of the factory.展开更多
To address the energy storage needs of wearable electronics,this study developed highperformance,flexible micro-supercapacitors(MSCs)using 2D and 3D patterned fabric-based microelectrodes.The 2D electrodes were create...To address the energy storage needs of wearable electronics,this study developed highperformance,flexible micro-supercapacitors(MSCs)using 2D and 3D patterned fabric-based microelectrodes.The 2D electrodes were created via a screen-printing method with an omnidirectional pre-stretching strategy,while 3D array-structured electrodes were formed through electrostatic actuation.Nano-MnO_(2)and Na0.77MnO_(2)were deposited to enhance pseudo-capacitive storage and widen the electrochemical window.The C-C/MnO_(2)-based MSCs exhibited a 21%pseudo-capacitance ratio,achieving an area-specific capacitance of 118.2 mF cm^(-2)at 5 mV s^(-1)and an energy density of 39.25 mWh cm^(-2)at 0.21 mW cm^(-2).These MSCs maintained 95.05%,92.04%,and 89.74%of their capacitance under stretched,twisted,and folded conditions,respectively,and showed stable performance across temperatures from^(-2)0℃to 60℃.Additionally,C-C/Na0.77MnO_(2)-based MSCs extended the electrochemical window to 1.6 V and retained 100.2%capacitance after 6500 cycles.This work offers innovative strategies for advancing portable and wearable electronic devices.展开更多
We report the fabrication of 4-inch nano patterned wafer by two-beam laser interference lithography and analyze the uniformity in detail. The profile of the dots array with a period of 800 nm divided into five regions...We report the fabrication of 4-inch nano patterned wafer by two-beam laser interference lithography and analyze the uniformity in detail. The profile of the dots array with a period of 800 nm divided into five regions is characterized by a scanning electron microscope. The average size in each region ranges from 270 nm to 320 nm,and the deviation is almost 4%, which is approaching the applicable value of 3% in the industrial process. We simulate the two-beam laser interference lithography system with MATLAB software and then calculate the distribution of light intensity around the 4 inch area. The experimental data fit very well with the calculated results. Analysis of the experimental data and calculated data indicates that laser beam quality and space filter play important roles in achieving a periodical nanoscale pattern with high uniformity and large area. There is the potential to obtain more practical applications.展开更多
With the advent of tissue engineering and biomedicine,the creation of extracellular matrix(ECM)biomaterials for in vitro applications has become a prominent and promising strategy.These ECM materials provide physical,...With the advent of tissue engineering and biomedicine,the creation of extracellular matrix(ECM)biomaterials for in vitro applications has become a prominent and promising strategy.These ECM materials provide physical,biochemical,and mechanical properties that guide cellular behaviors,such as proliferation,differentiation,migration,and apoptosis.Because micro-and nano-patterned materials have a unique surface topology and low energy replication process that directly affect cellular biological behaviors at the interface,the fabrication of micro-nano pattern biomaterials and the regulation of surface physical and chemical properties are of great significance in the fields of cell regulation,tissue engineering,and regenerative medicine.Herein,we provide a comprehensive review of the progress in the fabrication and application of patterned materials based on the coupling of mechanical action at the micro-and nano-meter scale,including photolithography,micro-contact printing,electron beam lithography,electrospinning,and 3D printing technology.Furthermore,a summary of the fabrication process,underlying principles,as well as the advantages and disadvantages of various technologies are reviewed.We also discuss the influence of material properties on the fabrication of micro-and nano-patterns.展开更多
We demonstrate InGaN violet light-emitting superluminescent diodes with large spectral width suitable for applications in optical coherence spectroscopy.This was achieved using the concept of nonlinear indium content ...We demonstrate InGaN violet light-emitting superluminescent diodes with large spectral width suitable for applications in optical coherence spectroscopy.This was achieved using the concept of nonlinear indium content profile along the superluminescent diode waveguide.A specially designed 3D substrate surface shape leads to a step-like indium content profile,with the indium concentration in the InGaN/GaN quantum wells ranging approximately between 6% and 10%.Thanks to this approach,we were able to increase the width of the spectrum in processed devices from 2.6 nm(reference diode)to 15.5 nm.展开更多
Photodetectors,as the core devices for optical signal conversion,need to balance high efficiency,fast response,and low-cost fabrication.Perovskite,with its advantages of high carrier mobility and tunable band gaps,hav...Photodetectors,as the core devices for optical signal conversion,need to balance high efficiency,fast response,and low-cost fabrication.Perovskite,with its advantages of high carrier mobility and tunable band gaps,have become an ideal alternative to silicon-based materials.This paper systematically reviews the progress in the patterned fabrication techniques and device construction of perovskite photodetectors across various dimensional material systems.First,it introduces five mainstream patterned fabrication methods for perovskites:template-confined growth,inkjet printing,vapor deposition,seed-induced growth,and conventional photolithography.Then,the latest research on image sensors based on perovskite materials in different dimensions is discussed.Following this,the paper highlights two promising application directions with great development potential:flexible wearable devices and electrochemical vision systems.Finally,the challenges and potential solutions for the future development of patterned perovskite photodetectors are presented to guide the development of high-performance perovskite optoelectronic devices.展开更多
Large-area gratings play a crucial role in various engineering fields.However,traditional interference lithography is limited by the size of optical component apertures,making large-area fabrication a challenging task...Large-area gratings play a crucial role in various engineering fields.However,traditional interference lithography is limited by the size of optical component apertures,making large-area fabrication a challenging task.Here,a method for fabricating laser interference lithography pattern arrays with a global alignment reference strategy is proposed.This approach enables alignment of each area of the laser interference lithography pattern arrays,including phase,period,and tilt angle.Two reference gratings are utilized:one is detached from the substrate,while the other remains fixed to it.To achieve global alignment,the exposure area is adjusted by alternating between moving the beam and the substrate.In our experiment,a 3×3 regions grating array was fabricated,and the−1st-order diffraction wavefront measured by the Fizeau interferometer exhibited good continuity.This technique enables effective and efficient alignment with high accuracy across any region in an interference lithography pattern array on large substrates.It can also serve as a common technique for fabricating various types of periodic structures by rotating the substrate.展开更多
基金National Key Research and Development Project,China(No.2018YFB1308800)。
文摘The background pattern of patterned fabrics is complex,which has a great interference in the extraction of defect features.Traditional machine vision algorithms rely on artificially designed features,which are greatly affected by background patterns and are difficult to effectively extract flaw features.Therefore,a convolutional neural network(CNN)with automatic feature extraction is proposed.On the basis of the two-stage detection model Faster R-CNN,Resnet-50 is used as the backbone network,and the problem of flaws with extreme aspect ratio is solved by improving the initialization algorithm of the prior frame aspect ratio,and the improved multi-scale model is designed to improve detection of small defects.The cascade R-CNN is introduced to improve the accuracy of defect detection,and the online hard example mining(OHEM)algorithm is used to strengthen the learning of hard samples to reduce the interference of complex backgrounds on the defect detection of patterned fabrics,and construct the focal loss as a loss function to reduce the impact of sample imbalance.In order to verify the effectiveness of the improved algorithm,a defect detection comparison experiment was set up.The experimental results show that the accuracy of the defect detection algorithm of patterned fabrics in this paper can reach 95.7%,and it can accurately locate the defect location and meet the actual needs of the factory.
基金supported by Scientific Research Project for Higher Education Institution in Hebei Province(No.BJK2023085)Natural Science Foundation Project of Hebei Province(E2024208048)+1 种基金National Natural Science Foundation of China(Grant No.22005083)Introduction of talents Research Funds for the Hebei University of Science and Technology(No.PYA2018012).
文摘To address the energy storage needs of wearable electronics,this study developed highperformance,flexible micro-supercapacitors(MSCs)using 2D and 3D patterned fabric-based microelectrodes.The 2D electrodes were created via a screen-printing method with an omnidirectional pre-stretching strategy,while 3D array-structured electrodes were formed through electrostatic actuation.Nano-MnO_(2)and Na0.77MnO_(2)were deposited to enhance pseudo-capacitive storage and widen the electrochemical window.The C-C/MnO_(2)-based MSCs exhibited a 21%pseudo-capacitance ratio,achieving an area-specific capacitance of 118.2 mF cm^(-2)at 5 mV s^(-1)and an energy density of 39.25 mWh cm^(-2)at 0.21 mW cm^(-2).These MSCs maintained 95.05%,92.04%,and 89.74%of their capacitance under stretched,twisted,and folded conditions,respectively,and showed stable performance across temperatures from^(-2)0℃to 60℃.Additionally,C-C/Na0.77MnO_(2)-based MSCs extended the electrochemical window to 1.6 V and retained 100.2%capacitance after 6500 cycles.This work offers innovative strategies for advancing portable and wearable electronic devices.
基金Supported by the Scientific Equipment Research Program of Chinese Academy of Sciences under Grant No 2014Y4201449
文摘We report the fabrication of 4-inch nano patterned wafer by two-beam laser interference lithography and analyze the uniformity in detail. The profile of the dots array with a period of 800 nm divided into five regions is characterized by a scanning electron microscope. The average size in each region ranges from 270 nm to 320 nm,and the deviation is almost 4%, which is approaching the applicable value of 3% in the industrial process. We simulate the two-beam laser interference lithography system with MATLAB software and then calculate the distribution of light intensity around the 4 inch area. The experimental data fit very well with the calculated results. Analysis of the experimental data and calculated data indicates that laser beam quality and space filter play important roles in achieving a periodical nanoscale pattern with high uniformity and large area. There is the potential to obtain more practical applications.
基金supported by Key Research Program of Frontier Sciences of CAS(No.QYKJZD-SSW-SLH02).
文摘With the advent of tissue engineering and biomedicine,the creation of extracellular matrix(ECM)biomaterials for in vitro applications has become a prominent and promising strategy.These ECM materials provide physical,biochemical,and mechanical properties that guide cellular behaviors,such as proliferation,differentiation,migration,and apoptosis.Because micro-and nano-patterned materials have a unique surface topology and low energy replication process that directly affect cellular biological behaviors at the interface,the fabrication of micro-nano pattern biomaterials and the regulation of surface physical and chemical properties are of great significance in the fields of cell regulation,tissue engineering,and regenerative medicine.Herein,we provide a comprehensive review of the progress in the fabrication and application of patterned materials based on the coupling of mechanical action at the micro-and nano-meter scale,including photolithography,micro-contact printing,electron beam lithography,electrospinning,and 3D printing technology.Furthermore,a summary of the fabrication process,underlying principles,as well as the advantages and disadvantages of various technologies are reviewed.We also discuss the influence of material properties on the fabrication of micro-and nano-patterns.
基金Narodowe Centrum Nauki(NCN)(2014/15/B/ST3/04252)Narodowe Centrum Badan'i Rozwoju(NCBR)(1/POLBER-1/2014)
文摘We demonstrate InGaN violet light-emitting superluminescent diodes with large spectral width suitable for applications in optical coherence spectroscopy.This was achieved using the concept of nonlinear indium content profile along the superluminescent diode waveguide.A specially designed 3D substrate surface shape leads to a step-like indium content profile,with the indium concentration in the InGaN/GaN quantum wells ranging approximately between 6% and 10%.Thanks to this approach,we were able to increase the width of the spectrum in processed devices from 2.6 nm(reference diode)to 15.5 nm.
基金supported by the National Key Research and Development Program of China(2021YFA1200801)the National Natural Science Foundation of China(No.E311L5191R,52188101,62450124,62125406,62074150)+7 种基金the China Postdoctoral Science Foundation(2024T170946,2023M733574)the Excellent Youth Fund Project of Liaoning Province(2023JH3/10200003)the Outstanding Youth Fund Project of Liaoning Province(2025JH6/101100015)the Special Projects of the Central Government in Guidance of Local Science and Technology Development(2024010859-JH6/1006)the Special Research Assistantship Project of the Chinese Academy of Sciences(E455L502)the China Postdoctoral Science Foundation under Grant Number GZB20230776the Liaoning Provincial Key Laboratory of Public Opinion and Network Security Information System(d252453002)the Artificial Intelligence Technology Innovation Project of Liaoning Province(Grant No.2023JH26/10300019).
文摘Photodetectors,as the core devices for optical signal conversion,need to balance high efficiency,fast response,and low-cost fabrication.Perovskite,with its advantages of high carrier mobility and tunable band gaps,have become an ideal alternative to silicon-based materials.This paper systematically reviews the progress in the patterned fabrication techniques and device construction of perovskite photodetectors across various dimensional material systems.First,it introduces five mainstream patterned fabrication methods for perovskites:template-confined growth,inkjet printing,vapor deposition,seed-induced growth,and conventional photolithography.Then,the latest research on image sensors based on perovskite materials in different dimensions is discussed.Following this,the paper highlights two promising application directions with great development potential:flexible wearable devices and electrochemical vision systems.Finally,the challenges and potential solutions for the future development of patterned perovskite photodetectors are presented to guide the development of high-performance perovskite optoelectronic devices.
基金supported by the National Natural Science Foundation of China(no.62275142)the Shenzhen Stable Supporting Program(no.WDZC20231124201906001).
文摘Large-area gratings play a crucial role in various engineering fields.However,traditional interference lithography is limited by the size of optical component apertures,making large-area fabrication a challenging task.Here,a method for fabricating laser interference lithography pattern arrays with a global alignment reference strategy is proposed.This approach enables alignment of each area of the laser interference lithography pattern arrays,including phase,period,and tilt angle.Two reference gratings are utilized:one is detached from the substrate,while the other remains fixed to it.To achieve global alignment,the exposure area is adjusted by alternating between moving the beam and the substrate.In our experiment,a 3×3 regions grating array was fabricated,and the−1st-order diffraction wavefront measured by the Fizeau interferometer exhibited good continuity.This technique enables effective and efficient alignment with high accuracy across any region in an interference lithography pattern array on large substrates.It can also serve as a common technique for fabricating various types of periodic structures by rotating the substrate.
