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Time-Resolved Selective Electrochemical Sensing of Carbon Particles.

This work demonstrated a new method for electrochemical detection of carbon black particles based on impact electrochemistry that was capable of selective detection of carbon black from the insulating oxide particles. We systematically studied the electrochemical collision events with carbon black particle suspension solution (pH 7.0 phosphate buffer) at varying carbon black concentrations using a convective condition and a gold microelectrode. We evaluated the effect of bias potential on the number and magnitude of collision spikes by changing the applied potential in chronoamperometry experiments. Our results showed that the biased potential of +0.4 V was the most suitable potential among the tested potential biases. Current blips were observed in the amperometric i-t response, and the spike numbers scaled linearly with the concentration of carbon black particles in the range of 2.5-20 μM (i.e., mass/volume concentration of 0.03 to 0.24 mg L-1) with the lowest detection limit of 0.396 μM (i.e., mass/volume concentration of 0.00475 mg L-1). The selective detection of carbon particles in the presence of representative poorly conductive oxide particles in our experimental conditions was achieved. The sensing mechanism of the sensitive and selective detection of carbon black particles is proposed. This work provides the basis for the development of powerful electroanalytical methods and technologies for the detection and classification of carbon particles in varying environmental conditions such as coalmines, engineered carbon particle factories, and coal power plants.