Js. Do et Ry. Shieh, ELECTROCHEMICAL NITROGEN-DIOXIDE GAS SENSOR-BASED ON SOLID POLYMERIC ELECTROLYTE, Sensors and actuators. B, Chemical, 37(1-2), 1996, pp. 19-26
Gold has been prepared on a solid polymeric electrolyte (SPE) by the c
hemical plating method. The characteristics of Au/SPE and the electroc
hemical behaviour of the cathodic reduction of nitrogen dioxide on the
prepared electrode have been studied in this paper. The loading of Au
on SPE increases when the concentration of reductants and the pH incr
ease. The maximum roughness factors of Au/Nafion(R) are 340 and 460 wh
en hydrazine dihydrochloride and sodium borohydride are used as reduct
ants, respectively, for the chemical plating. A linear relationship be
tween the limiting current and the concentration of NO2 is obtained an
d the sensitivity is 0.33 mu A ppm(-1) when the NO2 concentration is i
n the range 20.8 to 104.0 ppm.