title: Enhancing the Sensing Properties of TiO2Nanosheets with Exposed {001} Facets by a Hydrogenation and Sensing Mechanism.
abstract: Hydrogenation is successfully employed to improve sensing performances of the gas sensors based on TiO2nanosheets with exposed {001} facets for the first time. The hydrogenated TiO2nanosheets show a significantly higher response toward ethanol, acetone, triethylamine, or formaldehyde than the samples without hydrogenation, and the response further increases with an increase of the hydrogenation temperature. The excellent sensing performances are ascribed to an increase of the density of unsaturated Ti5catoms on the {001} surface resulting from the hydrogenation process. The unsaturated Ti5catoms are considered to serve as sensing reaction active sites. They can generate noncontributing (free) electrons and adsorb oxygen molecules, and the detailed sensing mechanism is described at atomic and molecule level. The hydrogenated strategy may be employed to enhance the sensing performances of other metal oxide sensors and catalytic reaction activities of catalyst. The concept of the surface unsaturated metal atoms serving as sensing reaction active sites not only deepens the understanding of the sensing reaction and catalytic reaction mechanism but also provides new insights into the design of advanced gas sensing materials, catalysts, and photoelectronic devices.
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Laboratory for Advanced Energy Technology; Key Laboratory of Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University , Xi'an 710119, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Laboratory for Advanced Energy Technology; Key Laboratory of Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University , Xi'an 710119, China.
authors.forename: Junfang
authors.initials: J
authors.lastname: Liu
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Laboratory for Advanced Energy Technology; Key Laboratory of Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University , Xi'an 710119, China.
authors.forename: Miao
authors.initials: M
authors.lastname: Wang
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Laboratory for Advanced Energy Technology; Key Laboratory of Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University , Xi'an 710119, China.
authors.forename: Cuijin
authors.initials: C
authors.lastname: Pei
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Laboratory for Advanced Energy Technology; Key Laboratory of Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University , Xi'an 710119, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Laboratory for Advanced Energy Technology; Key Laboratory of Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University , Xi'an 710119, China.
authors.forename: Yukun
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education; Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University , Xi'an 710119, China.
authors.forename: Shengzhong
authors.initials: S
authors.lastname: Liu
authors.affiliation: Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Laboratory for Advanced Energy Technology; Key Laboratory of Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University , Xi'an 710119, China.
authors.forename: Heqing
authors.identifier: http://orcid.org/0000-0002-6535-9378
authors.initials: H
authors.lastname: Yang