Par dynbio — Dernière modification 30/06/2011 16:27
An original nitrate sensor based on silver nanoparticles electrodeposited on a gold electrod
Katia Fajerwerg, V. Ynam, B. Chaudret, V. Garçon, D. Thouron and M. Comtat, Electrochemistry Communications, Vol. 12 (10), pp. 1439-1441,
The electroreduction of nitrate in synthetic seawater was investigated by cyclic voltammetry (CV) at a bare gold electrode modified by electrodeposited silver nanoparticles (AgNPs). The AgNPs were generated by chronoamperometry using a charge, Q, lower than the theoretical one corresponding to a silver monolayer. In these conditions, a linear range for nitrate determination is obtained from 10·10-6 mol L-1 to 10·10-3 mol L-1. Such a low limit of detection was achieved due to the combination of two chemical reactions coupled with electron transfer.