title: Iron oxide nanopropellers prepared by a low-temperature solution approach.
abstract: The alpha-Fe(2)O(3) (hematite) nanopropellers were synthesized via a low-temperature solution-based method using FeCl(2) as a precursor in the presence of urea and glycine hydrochloride. The formation of alpha-Fe(2)O(3) nanopropellers is strongly depended on the addition of glycine hydrochloride, which serves as a pH modulator and affects the oxidation rate of Fe(2+). The structural evolution of the propeller-structured hematite was found to follow dissolution and recrystallization processes. For the structural conformation, each nanopropeller presents a hexagonal central column closed by six equivalent surfaces of {(-)1100} and the six arrays of the nanopropeller structure are a result of growth along +/- [(-)1100], +/- [(-)1010], and +/-[0(-)110]. Preliminary results show that the magnetic maghemite (gamma-Fe(2)O(3)) nanopropellers could also be prepared by a reduction and reoxidation process from the alpha-Fe(2)O(3) (hematite) nanopropeller precursors.
authors.affiliation: Department of Chemistry and Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan.
authors.forename: Wan-Hua
authors.initials: WH
authors.lastname: Yang
authors.forename: Chi-Fang
authors.initials: CF
authors.lastname: Lee
authors.forename: Horng Yi
authors.initials: HY
authors.lastname: Tang
authors.forename: Dar-Bin
authors.initials: DB
authors.lastname: Shieh
authors.forename: Chen-Sheng
authors.initials: CS
authors.lastname: Yeh
mesh_terms: D002712:Chlorides; D005290:Ferric Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D005998:Glycine / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D012996:Solutions / Q000737:chemistry; D013696:Temperature; D014508:Urea / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D002712:Chlorides; D005290:Ferric Compounds; D012996:Solutions; C000499:ferric oxide; D014508:Urea; D005998:Glycine; C024555:ferric chloride