Imaging local electrochemical current via surface plasmon resonance.
We demonstrated an electrochemical microscopy technique based on the detection of variations in local electrochemical current from optical signals arising from surface plasmon resonance. It enables local electrochemical measurements (such as voltammetry and amperometry) with high spatial resolution and sensitivity, because the signal varies with current density rather than current. The imaging technique is noninvasive, scanning-free, and fast, and it constitutes a powerful tool for studying heterogeneous surface reactions and for analyzing trace chemicals.
Shan
Xiaonan
X
Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA.
Patel
Urmez
U
Wang
Shaopeng
S
Iglesias
Rodrigo
R
Tao
Nongjian
N
D003878:Dermatoglyphics; D055664:Electrochemical Techniques; D004563:Electrochemistry; D004566:Electrodes; D006046:Gold; D006801:Humans; D008853:Microscopy / Q000379:methods*; D010084:Oxidation-Reduction; D017975:Ruthenium Compounds / Q000737:chemistry; D020349:Surface Plasmon Resonance; D014303:Trinitrotoluene / Q000032:analysis / Q000737:chemistry
D017975:Ruthenium Compounds; D014303:Trinitrotoluene; D006046:Gold