Layered Heterostructure of Graphene and TiO₂ as a Highly Sensitive and Stable Photoassisted NO₂ Sensor.

ABSTRACT: As an atomically thin electric conductor with a low density of highly mobile charge carriers, graphene is a suitable transducer for molecular adsorption. In this study, we demonstrate that the adsorption properties can be significantly enhanced with a laser-deposited TiO₂ nanolayer on top of single-layer CVD graphene, whereas the effective charge transfer between the TiO₂-adsorbed gas molecules and graphene is retained through the interface. The formation of such a heterostructure with optimally a monolayer thick oxide combined with ultraviolet irradiation (wavelength 365 nm, intensity <1 mW/mm²) dramatically enhances the gas-sensing properties. It provides an outstanding sensitivity for detecting NO₂ in the range of a few ppb to a few hundred pp

SUBMITTER: Berholts A 

PROVIDER: S-EPMC11345727 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature