Next Article in Journal
Simulation of a Geiger-Mode Imaging LADAR System for Performance Assessment
Next Article in Special Issue
A Remote Sensor for Detecting Methane Based on Palladium-Decorated Single Walled Carbon Nanotubes
Previous Article in Journal
Active Pneumatic Vibration Control by Using Pressure and Velocity Measurements and Adaptive Fuzzy Sliding-Mode Controller
Previous Article in Special Issue
Hydrogen Sensing with Ni-Doped TiO2 Nanotubes
Sensors 2013, 13(7), 8445-8460; doi:10.3390/s130708445

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

1 School of Chemistry, Physics & Mechanical Engineering, QUT, Brisbane, QLD 4000, Australia 2 School of Electrical & Computer Engineering, RMIT University, Melbourne, VIC 3000, Australia
* Author to whom correspondence should be addressed.
Received: 10 April 2013 / Revised: 21 May 2013 / Accepted: 19 June 2013 / Published: 2 July 2013
(This article belongs to the Special Issue Gas Sensors - 2013)
View Full-Text   |   Download PDF [1315 KB, uploaded 21 June 2014]   |   Browse Figures


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 zinc oxide; gas sensors; self-assembly; porous structure
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Supplementary material

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote |
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.

View more citation formats

Related Articles

Article Metrics

For more information on the journal, click here


[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert