title: Controlled growth of large-area, uniform, vertically aligned arrays of alpha-Fe2O3 nanobelts and nanowires.
abstract: Vertically aligned iron oxide nanobelt and nanowire arrays have been synthesized on a large-area surface by direct thermal oxidation of iron substrates under the flow of O(2). The effects of reactive gas pressure, composition, and temperature have been systematically studied. It was found that nanobelts (width, tens of nanometers; thickness, a few nanometers) are produced in the low-temperature region (approximately 700 degrees C) whereas cylindrical nanowires tens of nanometers thick are formed at relatively higher temperatures (approximately 800 degrees C). Both nanobelts and nanowires are mostly bicrystallites with a length of tens of micrometers which grow uniquely along the [110] direction. The growth habits of the nanobelts and nanowires in the two temperature regions indicate the role of growth rate anisotropy and surface energy in dictating the ultimate nanomorphologies.
authors.affiliation: Department of Chemistry, Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Wen
authors.forename: Suhua
authors.initials: S
authors.lastname: Wang
authors.forename: Yong
authors.initials: Y
authors.lastname: Ding
authors.forename: Zhong Lin
authors.initials: ZL
authors.lastname: Wang
authors.forename: Shihe
authors.initials: S
authors.lastname: Yang
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*; D010316:Particle Size; D012680:Sensitivity and Specificity; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide