Oxalic acid mediated synthesis of WO{sub 3}.H{sub 2}O nanoplates and self-assembled nanoflowers under mild conditions

Journal Article · Fri Jul 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

OSTI ID:21580161

Linzhi, Li ^[1]; Yi, Wang ^[2]; Yunling, Li ^[1]; Dechong, Ma ^[1]; Yan, Zhao ^[1]; Shengnan, Hou; Xinli, Hao ^[1]

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1. College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082 (China)
2. Department of Regenerative Medicine, School of Pharmaceutical Sciences, Jilin University, Changchun 130023 (China)

Tungsten oxide hydrate (WO{sub 3}.H{sub 2}O) nanoplates and flower-like assemblies were successfully synthesized via a simple aqueous method. The effects of reaction parameters in solution on the preparation were studied. Nanoplates and nanoflowers can be selectively prepared by changing the amount of H{sub 2}C{sub 2}O{sub 4}. In-situ assembly of nanoplates to nanoflowers was also proposed for the formation of assembled nanostructures. In addition, the reaction time and temperature have important effects on the sizes of the as-obtained samples. Crystal structure, morphology, and composition of final nanostructures were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Optical properties of the synthesized samples and the growth mechanism were studied by UV-vis detection. Degradation experiments of Rhodamine B (RhB) were also performed on samples of nanoplates and nanoflowers under visible light illumination. Nanoflower sample exhibited preferable photocatalytic property to nanoplate sample. - Graphical abstract: The oxalic acid has a key role for the structure of WO{sub 3}.H{sub 2}O evolution from plates to flowers and the dehydration process of WO{sub 3}.2H{sub 2}O to WO{sub 3}.H{sub 2}O. Highlights: > Tungsten oxides hydrate was synthesized via a simple aqueous method. > The size of WO{sub 3}.H{sub 2}O was controlled by the reaction time and temperature. > The assembly of WO{sub 3}.H{sub 2}O nanoplates to nanoflowers was achieved with higher H{sub 2}C{sub 2}O{sub 4}/Na{sub 2}WO{sub 4} ratio. > Oxalic acid has a key role in the dehydration process of WO{sub 3}.2H{sub 2}O to WO{sub 3}.H{sub 2}O.

• OSTI ID: 21580161
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 7; Other Information: DOI: 10.1016/j.jssc.2011.05.008; PII: S0022-4596(11)00229-5; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CRYSTAL STRUCTURE
DEHYDRATION
MORPHOLOGY
NANOSTRUCTURES
OPTICAL PROPERTIES
OXALIC ACID
SCANNING ELECTRON MICROSCOPY
SODIUM TUNGSTATES
SYNTHESIS
TUNGSTEN OXIDES
WATER
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
CARBOXYLIC ACIDS
CHALCOGENIDES
COHERENT SCATTERING
DICARBOXYLIC ACIDS
DIFFRACTION
ELECTRON MICROSCOPY
HYDROGEN COMPOUNDS
MICROSCOPY
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SCATTERING
SODIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTATES
TUNGSTEN COMPOUNDS