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

Elsevier Science
Publication Type:
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?2¯?2¯?3¯} 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?2¯?2¯?3¯} surface of ZnO crystals has high surface energy. When used as a sensing material in gas sensors, ZnO crystals with dominating exposed {4?2¯?2¯?3¯} planes exhibited a superior sensitivity toward toxic and flammable gases.
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