Pd/Ni/Si-microchannel-plate-based amperometric sensor for ethanol detection

Pd/Ni/Si-microchannel-plate-based amperometric sensor for ethanol detection

Citation

Shi, J., Ci, P., Wang, F., Peng, H., Yang, P., Wang, L., … & Chu, P. K. (2011). Pd/Ni/Si-microchannel-plate-based amperometric sensor for ethanol detection. Electrochimica Acta, 56(11), 4197–4202. 

Keywords

  • Amperometric ethanol sensor
  • silicon microchannel plate
  • palladium nanoparticle
  • photo-assisted electrochemical etching

Brief

A highly sensitive amperometric ethanol sensor has been developed based on highly dispersed palladium nanoparticles on a vertically aligned nickel-coated silicon microchannel plate (MCP). 

Summary

A new amperometric ethanol sensor has been developed with palladium nanoparticles deposited on vertically aligned silicon microchannel arrays. This Pd/Ni/Si MCP electrode has high sensitivity, good stability, acceptable reproducibility, and quick response time for ethanol detection. The sensor's performance is attributed to:

  • High catalytic activity of palladium nanoparticles: Palladium acts as a catalyst for the electrochemical oxidation of ethanol, especially in alkaline media.
  • Large effective surface area due to the three-dimensional structure of the silicon MCP: This structure enhances the oxidation of ethanol compared to a planar electrode.

The Pd/Ni/Si MCP electrode has a sensitivity of 0.992 mA mM−1 cm−2, a detection limit of 16.8 μM, and a linear range up to 60 mM. This makes the Pd/Ni/Si MCP electrode a promising nonenzymatic ethanol sensor.

Origin:  https://www.cityu.edu.hk/phy/appkchu/Publications/2011/11.39.pdf

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