Abstract
A nanocomposite consisting of silver nanoparticle-decorated polyaniline and tungstophosphate was deposited on a glassy carbon electrode to result in an improved electrochemical sensor for dissolved hydrazine by the I-V (current-voltage) technique. The sensor, if operated at +0.5 V, has a fast response time (10 s), good sensitivity (similar to 12.5 mu Aa <...mM(-1)a <...cm(-2)) and long-term stability. Response to hydrazine is linear in the 10 nM to 10 mM concentration range, and the detection limit is 2.8 nM at a signal-to-noise ratio of 3.