Graphene Oxide–Chromium Oxide Hybrid Nanostructure for Humidity Sensing Applications
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A graphene oxide–chromium oxide (GO–Cr₂O₃) nanocomposite was successfully prepared through a simple and economical sol–gel method. The prepared material was thoroughly characterised using UV–Visible spectroscopy, FTIR, XRD, FESEM, and particle size analysis. UV–Vis studies revealed a broad absorption profile and an indirect band gap of 4.4 eV, confirming its wide-bandgap nature. XRD analysis indicated the formation of crystalline rhombohedral Cr₂O₃ embedded within the GO matrix, with an average crystallite size of 3.87 nm. FESEM images showed a granular, uneven surface with Cr₂O₃ nanoparticles anchored onto GO sheets. The nanocomposite was evaluated for its humidity-sensing behaviour in the 11–97% RH range using saturated salt solutions. A distinct drop in resistance with increasing humidity was observed, accompanied by good repeatability and quick adsorption-desorption behaviour. The combined features of high sensitivity, reproducibility, and wide operational range make GO–Cr₂O₃ a promising choice for next-generation humidity sensing technologies.
