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Light-Addressable Square Wave Voltammetry (LASWV) Based on a Field-Effect Structure for Electrochemical Sensing and
Jian Wang1,2, Fangming Chen1, Qin Guo1
1Institute of Medical Engineering, Department of Biophysics, School of Basic Medical Sciences, Health Science Center, Xi'an Jiaotong University, Xi'an 710061, China.
ACS Sensors
|April 9, 2021
Summary
We developed light-addressable square wave voltammetry (LASWV), a new photoelectrochemical imaging method. LASWV enables microresolution electrochemical measurements on field-effect substrates, acting as a chemical sensor for pH and enzymatic reactions.
Area of Science:
- Electrochemistry
- Semiconductor physics
- Chemical sensing
Background:
- Square wave voltammetry (SWV) is a technique used to measure electrochemical currents.
- Field-effect substrates are crucial for sensing applications.
- Photoelectrochemical methods offer unique advantages in probing material properties.
Purpose of the Study:
- To introduce a novel photoelectrochemical imaging method, light-addressable square wave voltammetry (LASWV).
- To demonstrate LASWV's capability as a microresolution chemical sensor.
- To explore the application of LASWV in measuring local electrochemical properties.
Main Methods:
- Utilizing an unstructured electrolyte/insulator/semiconductor (EIS) field-effect substrate.
- Employing an intensity-constant laser to illuminate and address the substrate.
- Measuring local SWV currents by detecting photoinduced capacitive currents.
Main Results:
- The current-potential (I-V) curves exhibit characteristics of field-effect device regions (accumulation, depletion, inversion).
- LASWV successfully measured solution pH and monitored enzymatic reactions.
- The laser spot acted as a virtual probe for microresolution electrochemical measurements, including impedance.
Conclusions:
- LASWV is a viable photoelectrochemical imaging technique for chemical sensing.
- The method allows for high-resolution mapping of electrochemical properties.
- LASWV opens new avenues for localized electrochemical analysis in various fields.
Keywords:
electrochemical sensorlight-addressablephotocurrentphotoelectrochemical imagingsquare wave voltammetryMore Related Videos
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