Abstract
This study reports the fabrication of a novel biphasic LPG sensor operable at room temperature. The biphasic Cu6Sn5:SnO2 nanocomposite is synthesized in 2 mol% and 4 mol% molar ratios through a facile hydrothermal route and fabricated into thin films. The microstructural details of these films are determined by an X-ray diffractometer (XRD). These films are further characterized for their morphology, elemental composition, optical and electrical properties employing field emission scanning electron microscopy (FE-SEM), energy dispersive x-ray spectroscopy (EDS), Fourier transform infrared (FTIR) spectrum, UV–visible (UV–vis) spectrophotometer and four-probe technique respectively. Liquefied petroleum gas (LPG) sensing results of the nanocomposite thin films suggest enhanced sensitivity and quick response and recovery time of the Cu6Sn5 dominant nanocomposite (4 mol%) thin film at room temperature. Additionally, this particular film exhibits a better humidity and LPG sensing performance with a sensitivity of 269 MΩ/%RH and 280 MΩ/vol. % for 2.0 vol % of LPG at room temperature respectively. The improved humidity and LPG sensing of the Cu6Sn5 dominant phase nanocomposite sample may be due to the formation of crystalline structure.
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