Single-Atom Cu Stabilized on Ultrathin WO_2.72 Nanowire for Highly Selective and Ultrasensitive ppb-Level Toluene Detection.

ABSTRACT: Various catalysts are developed to improve the performance of metal oxide semiconductor gas sensors, but achieving high selectivity and response intensity in chemiresistive gas sensors (CGSs) remains a significant challenge. In this study, an in situ-annealing approach to synthesize Cu catalytic sites on ultrathin WO_2.72 nanowires for detecting toluene at ultralow concentrations (R_a /R_g = 1.9 at 10 ppb) with high selectivity is developed. Experimental and molecular dynamic studies reveal that the Cu single atoms (SAs) act as active sites, promoting the oxidation of toluene and increasing the affinity of Cu single-atom catalysts (SACs)-containing sensing materials for toluene while weakening the association with carbon dioxide or water vapor. Density functio

SUBMITTER: Wang P 

PROVIDER: S-EPMC10502643 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature