Size- and shape-controlled conversion of tungstate-based inorganic-organic hybrid belts to WO3 nanoplates with high specific surface areas.
Two-dimensional monoclinic WO(3) nanoplates with high specific surface areas are synthesized through a novel conversion process using tungstate-based inorganic-organic hybrid micro/nanobelts as precursors. The process developed involves a topochemical transformation of tungstate-based inorganic-organic hybrid belts into WO(3) nanoplates via an intermediate product of H(2)WO(4) nanoplates, utilizing the similarity of the W-O octahedral layers in both H(2)WO(4) and WO(3). The as-obtained WO(3) nanoplates show a single-crystalline nanostructure with the smallest side along the [001] direction. The WO(3) nanoplates are 200-500 nm x 200-500 nm x 10-30 nm in size, and their specific surface areas are up to 180 m(2) g(-1). Photocatalytic measurements of visible-light-driven oxidation of water for O(2) generation in the presence of Ag(+) ions indicate that the activity of the as-obtained WO(3) nanoplates is one order of magnitude higher than that of commercially available WO(3) powders.
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China.
Deliang
D
Chen
Lian
L
Gao
Atsuo
A
Yasumori
Kazuyuki
K
Kuroda
Yoshiyuki
Y
Sugahara
D000327:Adsorption / Q000528:radiation effects; D002384:Catalysis / Q000528:radiation effects; D008027:Light; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure; D009584:Nitrogen / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010316:Particle Size; D013056:Spectrophotometry, Ultraviolet; D013499:Surface Properties / Q000528:radiation effects; D013997:Time Factors; D014414:Tungsten / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction
D010087:Oxides; D017973:Tungsten Compounds; C511604:tungsten oxide; D009584:Nitrogen; D010100:Oxygen; C045951:tungstate; D014414:Tungsten