随着柔性电子的发展,表皮电子在人机交互中的作用越来越突出.然而,柔性器件的稳定性和可靠性仍然是其得到广泛应用的一个挑战.本文设计一种以聚乙烯醇(PVA)为衬底,金(Au)为电极层的表面肌电(sEMG)电极阵列,通过原位焦耳加热方法对有源区...随着柔性电子的发展,表皮电子在人机交互中的作用越来越突出.然而,柔性器件的稳定性和可靠性仍然是其得到广泛应用的一个挑战.本文设计一种以聚乙烯醇(PVA)为衬底,金(Au)为电极层的表面肌电(sEMG)电极阵列,通过原位焦耳加热方法对有源区域PVA衬底进行精确热处理调控,提高其结晶度和模量,提升有源区域电极的稳定性.基于该方法制备的sEMG电极阵列实现了与皮肤的共形贴附,可稳定采集8 h以上的高信噪比(达到21.3 d B)的肌电信号,进一步开展了基于sEMG信号的手势识别应用研究,识别率可达99.27%.以上结果表明,本研究提出的sEMG电极阵列制备方法简单高效,可长时间稳定工作,有望在基于sEMG信号的人机交互领域中得到应用.展开更多
Bimetal catalysts are good alternatives for nonenzymatic glucose sensors owing to their low cost, high activity, good conductivity, and ease of fabrication. In the present study, a self-supported CuNi/C electrode prep...Bimetal catalysts are good alternatives for nonenzymatic glucose sensors owing to their low cost, high activity, good conductivity, and ease of fabrication. In the present study, a self-supported CuNi/C electrode prepared by electrodepositing Cu nanoparticles on a Ni-based metal–organic framework(MOF) derivate was used as a non-enzymatic glucose sensor. The porous construction and carbon scaffold inherited from the Ni-MOF guarantee good kinetics of the electrode process in electrochemical glucose detection. Furthermore, Cu nanoparticles disturb the array structure of MOF derived films and evidently enhance their electrochemical performances in glucose detection. Electrochemical measurements indicate that the CuNi/C electrode possesses a high sensitivity of17.12 mA mM^(-1) cm^(-2), a low detection limit of 66.67 nM,and a wider linearity range from 0.20 to 2.72 mM. Additionally, the electrode exhibits good reusability, reproducibility, and stability, thereby catering to the practical use of glucose sensors. Similar values of glucose concentrations in human blood serum samples are detected with our electrode and with the method involving glucose-6-phosphate dehydrogenase; the results further demonstrate the practical feasibility of our electrode.展开更多
To meet the growing demand for wearable smart electronic devices,the development of flexible lithium-ion batteries(LIBs)is essential.Silicon is an ideal candidate for the anode material of flexible lithium-ion batteri...To meet the growing demand for wearable smart electronic devices,the development of flexible lithium-ion batteries(LIBs)is essential.Silicon is an ideal candidate for the anode material of flexible lithium-ion batteries due to its high specific capacity,low working potential,and earth abundance.The largest challenge in developing a flexible silicon anode is how to maintain structural integrity and ensure stable electrochemical reactions during external deformation.In this work,we propose a novel design for fabricating core–shell electrodes based on a copper nanowire(CuNW)array core and magnetron sputtered Si/C shell.The nanowire array structure has characteristics of bending under longitudinal stress and twisting under transverse stress,which helps to maintain the mechanical stability of the structure during electrode bending and cycling.The low-temperature annealing generates a small amount of Cu3Si alloy,which enhances the connection strength between Si and the conductive network and solves the poor conductivity problem of Si,which is known as a semiconductor material.This unique configuration design of CuNW@Si@C-400℃ leads to stable long cycle performance of 1109 mAh∙g^(-1) after 1000 cycles and excellent rate performance of 500 mAh∙g^(-1) at a current density of 10 A∙g^(-1).Furthermore,the CuNW@Si@C-400℃||LiFePO_(4)(LFP)full battery demonstrates excellent flexibility,with a capacity retention of more than 96%after 100 bends.This study provides a promising strategy for the development of flexible lithium-ion batteries.展开更多
文摘随着柔性电子的发展,表皮电子在人机交互中的作用越来越突出.然而,柔性器件的稳定性和可靠性仍然是其得到广泛应用的一个挑战.本文设计一种以聚乙烯醇(PVA)为衬底,金(Au)为电极层的表面肌电(sEMG)电极阵列,通过原位焦耳加热方法对有源区域PVA衬底进行精确热处理调控,提高其结晶度和模量,提升有源区域电极的稳定性.基于该方法制备的sEMG电极阵列实现了与皮肤的共形贴附,可稳定采集8 h以上的高信噪比(达到21.3 d B)的肌电信号,进一步开展了基于sEMG信号的手势识别应用研究,识别率可达99.27%.以上结果表明,本研究提出的sEMG电极阵列制备方法简单高效,可长时间稳定工作,有望在基于sEMG信号的人机交互领域中得到应用.
基金supported by the National Natural Science Foundation of China (No. 21776052)the Natural Science Foundation of Heilongjiang Province (No. QC2016010)the Fundamental Research Funds for the Central Universities (No. HIT. IBRSEM. A. 201407)
文摘Bimetal catalysts are good alternatives for nonenzymatic glucose sensors owing to their low cost, high activity, good conductivity, and ease of fabrication. In the present study, a self-supported CuNi/C electrode prepared by electrodepositing Cu nanoparticles on a Ni-based metal–organic framework(MOF) derivate was used as a non-enzymatic glucose sensor. The porous construction and carbon scaffold inherited from the Ni-MOF guarantee good kinetics of the electrode process in electrochemical glucose detection. Furthermore, Cu nanoparticles disturb the array structure of MOF derived films and evidently enhance their electrochemical performances in glucose detection. Electrochemical measurements indicate that the CuNi/C electrode possesses a high sensitivity of17.12 mA mM^(-1) cm^(-2), a low detection limit of 66.67 nM,and a wider linearity range from 0.20 to 2.72 mM. Additionally, the electrode exhibits good reusability, reproducibility, and stability, thereby catering to the practical use of glucose sensors. Similar values of glucose concentrations in human blood serum samples are detected with our electrode and with the method involving glucose-6-phosphate dehydrogenase; the results further demonstrate the practical feasibility of our electrode.
基金Financial supports from the National Natural Science Foundation of China(No.22209075)the Natural Science Foundation of Chongqing(No.2022NSCQ-MSX4268)+1 种基金the Postdoctoral Innovation Talents Support Plan of Chongqing(No.CQBX2021012)the Scientific Research Project of Fujian Provincial Department of Education(No.JAT220530)are acknowledged.
文摘To meet the growing demand for wearable smart electronic devices,the development of flexible lithium-ion batteries(LIBs)is essential.Silicon is an ideal candidate for the anode material of flexible lithium-ion batteries due to its high specific capacity,low working potential,and earth abundance.The largest challenge in developing a flexible silicon anode is how to maintain structural integrity and ensure stable electrochemical reactions during external deformation.In this work,we propose a novel design for fabricating core–shell electrodes based on a copper nanowire(CuNW)array core and magnetron sputtered Si/C shell.The nanowire array structure has characteristics of bending under longitudinal stress and twisting under transverse stress,which helps to maintain the mechanical stability of the structure during electrode bending and cycling.The low-temperature annealing generates a small amount of Cu3Si alloy,which enhances the connection strength between Si and the conductive network and solves the poor conductivity problem of Si,which is known as a semiconductor material.This unique configuration design of CuNW@Si@C-400℃ leads to stable long cycle performance of 1109 mAh∙g^(-1) after 1000 cycles and excellent rate performance of 500 mAh∙g^(-1) at a current density of 10 A∙g^(-1).Furthermore,the CuNW@Si@C-400℃||LiFePO_(4)(LFP)full battery demonstrates excellent flexibility,with a capacity retention of more than 96%after 100 bends.This study provides a promising strategy for the development of flexible lithium-ion batteries.
