Journal
ACTA MATERIALIA
Volume 88, Issue -, Pages 245-251Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.01.036
Keywords
Microstructure; Morphology; Structure-property relationship; Surface; Sulfides
Funding
- Ministry of Science and Technology of Taiwan [NSC 102-2221-E-019-006-MY3]
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ZnS crystallites with a core shell heterostructure (ZnO-ZnS core-shell rods) and tube-like architecture were synthesized through a facile chemical solution route. Many tiny ZnS particles were clustered and compacted to form the shell layer of the ZnO-ZnS core-shell rods and the wall of the ZnS tubes during sulfidation of vertically aligned ZnO rods. X-ray diffraction and transmittance electron microscopy images revealed that the ZnS shell layer of the ZnO-ZnS core-shell rods and the wall of the tubes were polycrystalline, and that many domains or grain boundaries were present in the ZnS layers. The sensitivities of ZnO-ZnS core-shell rods and ZnS tubes to reducing and oxidizing gases differed. The ZnO-ZnS core-shell rods were more sensitive to reducing gases, whereas the ZnS tubes were more sensitive to oxidizing gases. The different gas sensing properties of the ZnS-based heterostructures and tubes are further discussed in relation to their microstructures. The heterojunction at the ZnO/ZnS interfacial region resulted in the differing gas sensing properties of the ZnS-based heterostructures and tubes in this study. (c) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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