Synthesis of nano-sized tungsten oxide particles encapsulated in a hollow silica sphere and their photocatalytic properties for decomposition of acetic acid using Pt as a co-catalyst.
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ABSTRACT: Nano-sized tungsten oxide (WO3) particles, each of which was encapsulated as a core in a hollow silica sphere (WO3@SiO2), were synthesized using calcium tungstate particles as the starting material. The calcium tungstate particles, each of which was covered with a silica shell, were converted to tungstic acid by nitric acid treatment and then to WO3 by heat treatment to obtain WO3@SiO2. A hollow space was formed in WO3@SiO2 between the WO3 core and the SiO2 shell as a result of shrinkage of WO3 during the heat treatment. The thus-obtained WO3@SiO2 was 40 nm in diameter, the WO3 core was 10 nm in diameter, and the silica shell, which was p
SUBMITTER: Harada T
PROVIDER: S-EPMC9052306 | biostudies-literature | 2020 Apr
REPOSITORIES: biostudies-literature
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