title: Highly sensitive gas sensor by the LaAlO3 /SrTiO3 heterostructure with Pd nanoparticle surface modulation.
abstract: The palladium nanoparticle (Pd NP)-decorated LaAlO3 /SrTiO3 (LAO/STO) heterostructure is for the first time used as a hydrogen-gas sensor with very high sensitivity and workability at room temperature. The outstanding gas-sensing properties are due to the Pd NPs' catalytic effect to different gases, resulting in charge coupling between the gas molecules and the two-dimensional electron gas (2DEG) through the Pd NPs by either a direct charge exchange or a change of the electron affinity. These results provide insight into the emerging properties at LAO/STO interfaces.
authors.affiliation: Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P. R. China.
authors.forename: Ngai Yui
authors.initials: NY
authors.lastname: Chan
authors.forename: Meng
authors.initials: M
authors.lastname: Zhao
authors.forename: JianXing
authors.initials: J
authors.lastname: Huang
authors.forename: Kit
authors.initials: K
authors.lastname: Au
authors.forename: Man Hon
authors.initials: MH
authors.lastname: Wong
authors.forename: Hei Man
authors.initials: HM
authors.lastname: Yao
authors.forename: Wei
authors.initials: W
authors.lastname: Lu
authors.forename: Yan
authors.initials: Y
authors.lastname: Chen
authors.forename: Chung Wo
authors.initials: CW
authors.lastname: Ong
authors.forename: Helen Lai Wa
authors.initials: HL
authors.lastname: Chan
authors.forename: Jiyan
authors.initials: J
authors.lastname: Dai
keywords: LaAlO3/SrTiO3; gas sensor; hydrogen; interface; palladium; two-dimensional electron gas