title: Fe2O3/TiO2 tube-like nanostructures: synthesis, structural transformation and the enhanced sensing properties.
abstract: The paper describes for the first time the successful synthesis of Fe(2)O(3)/TiO(2) tube-like nanostructures, in which TiO(2) shell is of quasi-single crystalline characteristic and its thickness can be controlled through adjusting the added amount of aqueous Ti(SO(4))(2) solution. The characterization of samples obtained at different stages using transmission electron microscope indicates that the outer TiO(2) shell is changed gradually from amorphous and polycrystalline phase into quasi-single crystal under thermal actions through the Ostwald ripening process, accompanying the corrosion of the central parts of Fe(2)O(3) nanorods, and the formation of small particles separating each other, leading to the special core/shell nanorods. Furthermore, Fe(2)O(3)/TiO(2) tube-like nanostructures can be transformed into Fe(2)TiO(5) nanostructures after they are thermally treated at higher temperatures. Those nanostructures exhibit enhanced ethanol sensing properties with respect to the monocomponent. Our results imply that not only hollow nanostructures, but also a novel type of nanostructures can be fabricated by the present method for nanodevices.
authors.affiliation: College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
authors.forename: Chun-Ling
authors.initials: CL
authors.lastname: Zhu
authors.forename: Hai-Long
authors.initials: HL
authors.lastname: Yu
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhang
authors.forename: Tie-Shi
authors.initials: TS
authors.lastname: Wang
authors.forename: Qiu-Yun
authors.initials: QY
authors.lastname: Ouyang
authors.forename: Li-Hong
authors.initials: LH
authors.lastname: Qi
authors.forename: Yu-Jin
authors.initials: YJ
authors.lastname: Chen
authors.forename: Xin-Yu
authors.initials: XY
authors.lastname: Xue
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry*; D005740:Gases / Q000032:analysis; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; D005740:Gases; D014867:Water; C009495:titanium dioxide; C000499:ferric oxide; D014025:Titanium