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Imaging Local Electric Field Distribution by Plasmonic Impedance Microscopy
Yixian Wang1,2, Xiaonan Shan1,2, Shaopeng Wang1,2
1Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University , Tempe, Arizona 85287, United States.
Analytical Chemistry
|December 29, 2015
Summary
Plasmonic electrochemical impedance microscopy (P-EIM) images local electric fields on electrode surfaces. This technique visualizes surface charge distribution and electric fields, advancing nanoscale surface analysis.
Area of Science:
- Electrochemistry
- Surface Science
- Nanotechnology
Background:
- Understanding local electric fields on electrode surfaces is crucial for electrochemical processes.
- Existing methods lack the spatial resolution to image these fields effectively.
Purpose of the Study:
- To introduce and demonstrate plasmonic electrochemical impedance microscopy (P-EIM) for imaging local electric fields.
- To characterize surface charge distribution and electric field dependence on proximity.
Main Methods:
- Utilized plasmonic electrochemical impedance microscopy (P-EIM).
- Employed a micropipet electrode positioned over a sample electrode to generate local electric fields.
- Performed finite element calculations for comparison.
Main Results:
- Successfully imaged the distribution of surface charge and local electric fields on an electrode.
- Measured spatial distribution and distance dependence of local charge density and electric field.
- Validated experimental results with finite element calculations.
Conclusions:
- P-EIM provides high-resolution imaging of local electric fields and surface charge.
- Demonstrated the potential for integrating P-EIM with scanning probe microscopy techniques like SICM.
