Optical hydrogen sensing with high-Q guided-mode resonance of Al₂O₃/WO₃/Pd nanostructure.

ABSTRACT: Nanostructure based on a dielectric grating (Al₂O₃), gasochromic oxide (WO₃) and catalyst (Pd) is proposed as a hydrogen sensor working at the room temperature. In the fabricated structure, the Pd catalyst film was as thin as 1 nm that allowed a significant decrease in the optical absorption. A high-Q guided-mode resonance was observed in a transmission spectrum at normal incidence and was utilized for hydrogen detection. The spectra were measured at 0-0.12% of hydrogen in a synthetic air (≈ 80% [Formula: see text] and 20% [Formula: see text]). The detection limit below 100 ppm of hydrogen was demonstrated. Hydrogen was detected in the presence of oxygen, which provides the sensor recovery but suppresses the sensor response. Sensor response was treated by t

SUBMITTER: Kulikova DP 

PROVIDER: S-EPMC9845354 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature