Photothermally-assisted Pt-modified WO3 nanosphere structures for highly efficient H2 sensing

Abstract

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.