ZnO nanocrystals with a high percentage of exposed {4 2̄ 2̄ 3̄} reactive facets for enhanced gas sensing performance

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Journal Article
Sensors and Actuators, B: Chemical, 2013, 186 pp. 286 - 292
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Zinc oxide single crystals with a high percentage of exposed {4 2̄ 2̄ 3̄} reactive facet were prepared by a facile hydrothermal route. X-ray diffraction, field emission scanning electron microscopy, and high resolution transmission microscopy confirmed the faceted single crystal structure. Through the density functional theory (DFT) calculations, it is validated that the {4 2̄ 2̄ 3̄} surface of ZnO crystals has high surface energy. When used as a sensing material in gas sensors, ZnO crystals with dominating exposed {4 2̄ 2̄ 3̄} planes exhibited a superior sensitivity toward toxic and flammable gases. © 2013 Elsevier B.V.
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