Electrochemical Synthesis, Characterization and Gas Sensing Properties of Hybrid Ppy/CS Coated ZnO Nanospheres

摘要

Electrochemical deposition method was used to synthesis a new poly-pyrrole (Ppy), zinc oxide (ZnO)nanoparticles (NPs), and chitosan (CS) nanospheres. The Ppy/CS/ZnO film was analyzed for gassensing properties. The morphology of Ppy/CS/ZnO electrodes was characterized by scanning electronmicroscopy (SEM), transmission electron microscopy (TEM). Chemical compositions of Ppy/CS/ZnOelectrodes were characterized by energy dispersive X-ray analysis (EDX). A high selectivity andresponse towards hydrogen were realized with a ZnO NPs core and chitosan/Ppy shell hybridnanospheres. Optimum sensing response was achieved with Ppy/CS nanospheres synthesized in thepresence of 12 wt% ZnO NPs. The sensing response of fabricated sensor was proportional to thehydrogen gas concentration and exhibited a fast response over a wide dynamic range. The enhancedresponse originated from the sensing mechanism related with composition and morphology ofdeposited nanospheres.