Local microcurrent monitoring is of great significance for biological and battery systems,yet it poses a formidable challenge.The current measurement techniques rely on electromagnetic materials which inevitably intro...Local microcurrent monitoring is of great significance for biological and battery systems,yet it poses a formidable challenge.The current measurement techniques rely on electromagnetic materials which inevitably introduce interference to the system under examination.To address this issue,a promising approach based on a dielectric fiberoptic sensor is demonstrated.The microfiber is capable of detecting microcurrent through monitoring the localized proton concentration signal with a pH resolution of 0.0052 pH units.By sensing the refractive index variation surrounding the sensor induced by the interaction between local proton concentration changes and oxidizer-treated microfiber surface through the evanescent field,this sensing mechanism effectively avoids the interference of the electromagnetic material on the performance of the tested system.This sensor exhibits a limit of detection for microcurrent of 1μA.The sensing region is a microfiber with a diameter of 8.8μm.It can get invaluable information that cannot be obtained through conventional electrochemical methods.Examples include photocurrent attenuation in photogenerated carrier materials during illumination,electrical activation in nerve cells,and fluctuations in the efficiency of electrical energy generation during battery discharge.This approach provides a powerful complement to electrochemical methods for the elucidation of microscale reaction mechanisms.The information provided by the prepared dielectric fiber-optic sensor will shed more light on proton kinetics and electrochemical and electrobiological mechanisms,which may fll an important gap in the current bioelectricity and battery monitoring methods.展开更多
基金was supported by the National Natural Science Foundation of China(No.62375108)the Guangdong Basic and Applied Basic Research Foundation(No.2024A1515010088)+1 种基金the Guangzhou Science and Technology Plan Project(No.2023A03J0130)the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(No.2019BT02X105).
文摘Local microcurrent monitoring is of great significance for biological and battery systems,yet it poses a formidable challenge.The current measurement techniques rely on electromagnetic materials which inevitably introduce interference to the system under examination.To address this issue,a promising approach based on a dielectric fiberoptic sensor is demonstrated.The microfiber is capable of detecting microcurrent through monitoring the localized proton concentration signal with a pH resolution of 0.0052 pH units.By sensing the refractive index variation surrounding the sensor induced by the interaction between local proton concentration changes and oxidizer-treated microfiber surface through the evanescent field,this sensing mechanism effectively avoids the interference of the electromagnetic material on the performance of the tested system.This sensor exhibits a limit of detection for microcurrent of 1μA.The sensing region is a microfiber with a diameter of 8.8μm.It can get invaluable information that cannot be obtained through conventional electrochemical methods.Examples include photocurrent attenuation in photogenerated carrier materials during illumination,electrical activation in nerve cells,and fluctuations in the efficiency of electrical energy generation during battery discharge.This approach provides a powerful complement to electrochemical methods for the elucidation of microscale reaction mechanisms.The information provided by the prepared dielectric fiber-optic sensor will shed more light on proton kinetics and electrochemical and electrobiological mechanisms,which may fll an important gap in the current bioelectricity and battery monitoring methods.
