Methyl red/polycarbazole composites: Humidity sensing characteristics and its adsorption kinetics study

Abstract

Abstract Here, we have portrayed the development of novel polycarbazole - organic dye (methyl red) based composite material for humidity sensing application. Polycarbazole (PCz) was synthesized by well known chemical oxidative polymerisation method and PCz-dye composite material was developed via sonochemical technique. The porous nature of this organic moiety based composite material is apparent from FESEM micrograph. The optical property is simultaneously delineated by UV-Visible spectroscopy. The surface porosity of composite material is determined by BET analysis. This composite material is very sensitive towards humidity ranges from 8% to 97%. The best repeatability of the result is observed at very low (8%-23% RH) and very high (75%-97%) RH level. Moreover, the change in capacitance value in presence of different humidity level has been modelled using Redlich-Peterson isotherm model.