title: High ethanol sensitivity of palladium/TiO2 nanobelt surface heterostructures dominated by enlarged surface area and nano-Schottky junctions.
abstract: TiO(2) nanobelts were prepared by the hydrothermal growth method. The surface of the nanobelts was coarsened by selective acid corrosion and functionalized with Pd catalyst particles. Three nanobelt samples (TiO(2) nanobelts, surface-coarsened TiO(2) nanobelts and Pd nanoparticle/TiO(2) nanobelt surface heterostructures) were configured as gas sensors and their sensing ability was measured. Both the surface-coarsened nanobelts and the Pd nanoparticle-decorated TiO(2) nanobelts exhibited dramatically improved sensitivity to ethanol vapor. Pd nanoparticle-decorated TiO(2) nanobelts with surface heterostructures exhibited the best sensitivity, selectivity, working temperature, response/recovery time, and reproducibility. The excellent ethanol sensing performance is attributed to the large surface area and enhancement by Schottky barrier-type junctions between the Pd nanoparticles and TiO(2) nanobelts.
authors.affiliation: State Key Laboratory of Crystal Materials, Center of Bio & Micro/Nano Functional Materials, Shandong University, Jinan 250100, PR China.
authors.forename: Dongzhou
authors.initials: D
authors.lastname: Wang
authors.forename: Weijia
authors.initials: W
authors.lastname: Zhou
authors.forename: Peiguang
authors.initials: P
authors.lastname: Hu
authors.forename: Yu
authors.initials: Y
authors.lastname: Guan
authors.forename: Limei
authors.initials: L
authors.lastname: Chen
authors.forename: Jianhua
authors.initials: J
authors.lastname: Li
authors.forename: Guancong
authors.initials: G
authors.lastname: Wang
authors.forename: Hong
authors.initials: H
authors.lastname: Liu
authors.forename: Jiyang
authors.initials: J
authors.lastname: Wang
authors.forename: Guozhong
authors.initials: G
authors.lastname: Cao
authors.forename: Huaidong
authors.initials: H
authors.lastname: Jiang
mesh_terms: D002384:Catalysis; D000431:Ethanol / Q000737:chemistry*; D005740:Gases / Q000032:analysis*; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology; D010165:Palladium / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D005740:Gases; C009495:titanium dioxide; D000431:Ethanol; D010165:Palladium; D014025:Titanium