Electrochemical sensor arrays with high temporal and spatial resolution can greatly facilitate various parallel sensing applications. Here, Guopeng Li and Rui Hao from the Department of Chemistry and Chemical Engineering at Harbin Institute of Technology and the Department of Chemistry at Southern University of Science and Technology provide a simple method for controlling and scaling up bipolar nanoelectrode arrays (BPnEAs) for high-resolution electrochemical sensing applications. BPeEAs were prepared on silicon nitride film windows using dual beam FIB nanofabrication technology. The traditional electrochemical oxidation-reduction reaction is coupled with the tris (2,20-bipyridine) ruthenium/2- (dibutylamine) ethanol electrochemiluminescence (ECL) system, which is based on a high viscosity solvent to reduce molecular diffusion, allowing for high spatial and temporal resolution reporting of traditional electrochemical oxidation-reduction processes. The BPeEA ECL sensor was demonstrated on 10 × 10 Pt or C BPeEAs for monitoring the reduction of 0.5 M H2SO4. The BPnEA ECL sensor containing different electrode materials (Pt and C) was first reported and used to monitor the reduction of 0.5 M H2SO4, revealing the difference in electrocatalytic ability between Pt and C. Subsequently, the outstanding ability of the BPnEA ECL system in catalyst screening was revealed.

Source: Sensor Expert Network