Humidity sensing properties of surface modified polyaniline ZnO nanocomposites

Abstract

Purpose – The aim of this study is to investigate the humidity-sensing of polyaniline–zinc oxide (PANI–ZnO) nanocomposites. Humidity sensor has wide applications in drug industries, food industries and domestic purpose to regulate the humidity level. Design/methodology/approach – PANI–ZnO composites were prepared by in situ polymerization method, and further humidity response was tested by using a two-probe sensor setup. Findings – PANI-ZnO composites surface were modified by using camphor sulphonic acid. DC conductivity is due to the hopping of polorans. Thermal coefficient value varies from 1.7 to 2.3. The 30 weight per cent composite shows high sensitivity among other composites. Research limitations/implications – These composites can be used only at room temperature or moderate temperature, i.e. below 280°C. Practical implications – The composites are prepared in tetrapod shape that has a large surface area and more stability. Therefore, these materials would be the replacement for conventional materials. Social implications – These sensors have many applications in food and drug preservation, domestic purposes, etc. Originality/value – This work is original, and not being considered for publication elsewhere. In this work, the charge transport properties were evaluated based on the resistivity change when samples were exposed to humidity.