Preparation of Ag nanoparticle-decorated polypyrrole colloids and their application for H2O2 detection

The present communication reports on the preparation of Ag nanoparticle-decorated polypyrrole colloids (AgNP-PPyCs) by heating a AgNO3 aqueous solution and pre-formed PPy colloids solution in the absence of any external reducing agent. It suggests that these AgNP-PPyCs exhibit remarkable catalytic performance toward H2O2 reduction. This enzymeless H2O2 sensor shows a fast amperometric response time of less than 2 s, and the corresponding linear range and detection limit are estimated to be from 0.1 mM to 90 mM (r = 0.998) and 1.05 mu M, respectively, at a signal-to-noise ratio of 3. (C) 2011 Elsevier B.V. All rights reserved.