Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 129, Issue 1-2, Pages 53-61Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2011.03.055
Keywords
Zinc stannate; Hydrothermal; Morphology; Gas sensitivity
Categories
Funding
- National Natural Science Foundation of China [20725310, 21021061, 21073145]
- Key Scientific Project of Fujian Province of China [2009HZ0002-1, 2009Y0045]
- National Basic Research Program of China [2007CB815303, 2011CBA00508]
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Zinc stannates (Zn2SnO4) with different morphologies and crystal structures were synthesized via low-temperature hydrothermal method in the presence of various alkaline mineralizers. Zn2SnO4 generally crystallizes into an inverse spinel crystal structure (cubic phase). However, we found that Zn2SnO4 could assembly into a slightly distorted cubic structure (quasi-cubic phase) for the first time by using tetrabutylammonium hydroxide as an alkaline mineralizer. In addition, we successfully tuned the morphologies of the as-prepared Zn2SnO4 particles, from cube, cuboctahedron, truncated octahedron, to octahedron, by adjusting the type and the concentration of alkaline mineralizers and surfactants. Compared with cubic Zn2SnO4, the quasi-cubic Zn2SnO4 showed a noticeable red shift of the band gap, and the gas sensors based on quasi-cubic Zn2SnO4 exhibited high sensitive performance to alcohol. XPS analyses revealed that the shift of Zn 2p(3/2) binding energy in the quasi-cubic Zn2SnO4, which indicated some Zn ions in quasi-cubic Zn2SnO4 adopted different coordination environments from regular tetrahedral/octahedral ones adopted in cubic Zn2SnO4. (C) 2011 Elsevier B.V. All rights reserved.
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