Liquid phase deposition synthesis of hexagonal molybdenum trioxide thin films
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokko, Nada, Kobe 657-8501 (Japan)
Hexagonal molybdenum trioxide thin films with good crystallinity and high purity have been fabricated by the liquid phase deposition (LPD) technique using molybdic acid (H{sub 2}MoO{sub 4}) dissolved in 2.82% hydrofluoric acid (HF) and H{sub 3}BO{sub 3} as precursors. The crystal was found to belong to a hexagonal hydrate system MoO{sub 3}.nH{sub 2}O (napprox0.56). The unit cell lattice parameters are a=10.651 A, c=3.725 A and V=365.997 A{sup 3}. Scanning electron microscope (SEM) images of the as-deposited samples showed well-shaped hexagonal rods nuclei that grew and where the amount increased with increase in reaction time. X-ray photon electron spectroscopy (XPS) spectra showed a Gaussian shape of the doublet of Mo 3d core level, indicating the presence of Mo{sup 6+} oxidation state in the deposited films. The deposited films exhibited an electrochromic behavior by lithium intercalation and deintercalation, which resulted in coloration and bleaching of the film. Upon dehydration at about 450 deg. C, the hexagonal MoO{sub 3}.nH{sub 2}O was transformed into the thermodynamically stable orthorhombic phase. - Abstract: SEM photograph of typical h-MoO{sub 3}.nH{sub 2}O thin film nuclei obtained after 36 h at 40 deg. C by the LPD method. Display Omitted
- OSTI ID:
- 21370565
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 9 Vol. 182; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALKALI METALS
BLEACHING
BORIC ACID
BORON COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DEHYDRATION
DEPOSITION
ELECTRO-OPTICAL EFFECTS
ELECTROCHROMISM
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ELEMENTS
FILMS
FLUIDS
FLUORINE COMPOUNDS
HALOGEN COMPOUNDS
HEXAGONAL LATTICES
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INORGANIC COMPOUNDS
IONS
LATTICE PARAMETERS
LIQUIDS
LITHIUM
METALS
MICROSCOPY
MOLYBDENUM COMPOUNDS
MOLYBDENUM IONS
MOLYBDENUM OXIDES
MOLYBDIC ACID
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
REFRACTORY METAL COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
X-RAY PHOTOELECTRON SPECTROSCOPY