Presentation Information
[1C05]Operando spectroscopic measurements for thin-film gas sensor materials.
*Ryo Toyoshima1, Ken Uchida1 (1. The University of Tokyo)
Recently, sensor materials capable of detecting H2 gas in ambient air and human breath with high sensitivity (1 ppm) have been developed using nanometer-thick platinum (Pt) thin films. It is assumed that variations in the surrounding gas atmosphere induce changes in the chemical state (oxidation/reduction) and crystal structure near the sensor surface, leading to resistance changes; however, the detailed sensing mechanism remains unclear. In this study, we performed simultaneous resistance and X-ray absorption fine structure (XAFS) measurements under a hydrogen gas atmosphere to elucidate the sensing mechanism under ambient conditions.