Highly efficient reduced tungsten oxide-based hydrogen gas sensor at room temperature

Reduced tungsten oxide nanoparticles (WO2.72) was synthesized from tungsten trioxide by calcination method. The prepared samples were systematically characterized via field-emission scanning electroscope (FESEM), Raman spectroscopy, and X-ray diffraction (XRD). Then, the prepared WO2.72 was spin coated on Si/SiO2 substrate, and the sensor was developed with interdigital electrode. The gas sensing property of the developed sensor toward H2 gas was investigated. The result shows that the fabricated WO2.72 sensor possesses excellent H2 gas sensor response of 27% at room temperature. Moreover, the WO2.72 sensor exhibited outstanding long-term stability and repeatability at 500 ppm. Besides, it exhibited stable sensor response in wide range of humidity reaveviling its potential candidacy for real application of H2 gas monitoring. Therefore, this study paves way for development of effective, stable and fast responsing H2 gas sensor at room temperature that is very important in environmental remediation.