Photothermally-assisted Pt-modified WO3 nanosphere structures for highly efficient H2 sensing
Herein, we present a visible light assisted high-performance H2 gas sensor based on a Pt-modified WO3 nanosphere structure. The obtained results show that the Pt–WO3 nanospheres have a higher response, faster response/recovery time, and better selectivity than pure WO3. At 109 °C, the Pt–WO3 nanosphere structure exhibits a response of 80.49 to 5 ppm H2, which is 80 times higher than that of pure WO3 nanospheres. The irradiation of visible light lowers the power consumption of the sensor. H2 response is improved through the introduction of all visible light wavelengths. Under visible light (λ = 530 nm) illumination at 109 °C, the response of nanosphere structure elevates to 133.71 for 5 ppm H2. Additionally, the H2 gas-sensing mechanism of the Pt-modified WO3 nanosphere structure sensors under visible light illumination is discussed.