Solution based–spin cast processed LPG sensor at room temperature

•The SEM image of the composite showed granular porous morphology that is very much conducive for LPG adsorption.•The sensing response of 45.21% was observed at 500ppm of LPG at room temperature with a response time of 30s and recovery time of 50s, respectively.•The composite showed stable sensing ability over a period of two months with a small degradation of 3.26%. Liquefied petroleum gas (LPG) sensor was fabricated by solution based-spin casting of thin films of polyaniline-niobium pentoxide (PANI-Nb2O5) composite onto glass substrate at room temperature. The PANI-Nb2O5 composite was synthesized by relatively simple method of in-situ chemical polymerization at room temperature and was structurally characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The composite was then chemically processed and coated on an easily available glass substrate to obtain a film of the composite by cost effective spin coating technique. The sensing response of 45.21% was observed at 500ppm of LPG at room temperature with a response time of 30s and recovery time of 50s, respectively. The composite showed stable sensing ability over a period of two months with a small degradation of 3.26%.