Sensors 2013, 13(7), 8445-8460; doi:10.3390/s130708445
Article

Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas Sensitivity

Received: 10 April 2013; in revised form: 21 May 2013 / Accepted: 19 June 2013 / Published: 2 July 2013
(This article belongs to the Special Issue Gas Sensors - 2013)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Complex three-dimensional structures comprised of porous ZnO plates were synthesized in a controlled fashion by hydrothermal methods. Through subtle changes to reaction conditions, the ZnO structures could be self-assembled from 20 nm thick nanosheets into grass-like and flower-like structures which led to the exposure of high proportions of ZnO {0001} crystal facets for both these materials. The measured surface area of the flower-like and the grass, or platelet-like ZnO samples were 72.8 and 52.4 m2∙g−1, respectively. Gas sensing results demonstrated that the porous, flower-like ZnO structures exhibited enhanced sensing performance towards NO2 gas compared with either grass-like ZnO or commercially sourced ZnO nanoparticle samples. The porous, flower-like ZnO structures provided a high surface area which enhanced the ZnO gas sensor response. X-ray photoelectron spectroscopy characterization revealed that flower-like ZnO samples possessed a higher percentage of oxygen vacancies than the other ZnO sample-types, which also contributed to their excellent gas sensing performance.
Keywords: zinc oxide; gas sensors; self-assembly; porous structure
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MDPI and ACS Style

Chang, J.; Ahmad, M.Z.; Wlodarski, W.; Waclawik, E.R. Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas Sensitivity. Sensors 2013, 13, 8445-8460.

AMA Style

Chang J, Ahmad MZ, Wlodarski W, Waclawik ER. Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas Sensitivity. Sensors. 2013; 13(7):8445-8460.

Chicago/Turabian Style

Chang, Jin; Ahmad, Muhammad Z.; Wlodarski, Wojtek; Waclawik, Eric R. 2013. "Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas Sensitivity." Sensors 13, no. 7: 8445-8460.

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