Non-aqueous synthesis of hexagonal ZnO nanopyramids : gas sensing properties

Ahmad, Muhammad Z., Chang, Jin, Ahmad, Muhammad S., Waclawik, Eric R., & Wlodarski, Wojtek (2012) Non-aqueous synthesis of hexagonal ZnO nanopyramids : gas sensing properties. Sensors and Actuators B : Chemical, 177, pp. 286-294.

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Abstract

Zinc oxide (ZnO) nanopyramids were synthesized by a one-pot route in a non-aqueous and surfactantfree environment. The synthesized metal oxide was characterized using SEM, XRD, and TEM to investigate the surface morphology and crystallographic phase of the nanostructures. It was observed that the ZnO nanopyramids were of uniform size and symmetrical, with a hexagonal base and height of ∼100 nm. Gas sensing characterization of the ZnO nanopyramids when deposited as thin-film onto conductometric transducers were performed towards NOx and C2H5OH vapor of different concentrations over a temperature range of 22–350 ◦C. It was observed that the sensors responded towards NO2 (10 ppm) and C2H5OH(250 ppm) analytes best at temperatures of 200 and 260 ◦C with a sensor response of 14.5 and 5.72, respectively. The sensors showed satisfactory sensitivity, repeatability as well as fast response and recovery towards both the oxidizing and the reducing analyte. The good performance was attributed to the low amount of organic impurities, large surface-to-volume ratio and high crystallinity of the solvothermally synthesized ZnO nanopyramids.

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14 citations in Web of Science®

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ID Code: 56447
Item Type: Journal Article
Refereed: Yes
Keywords: ZnO, Gas sensing
DOI: 10.1016/j.snb.2012.11.013
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200) > Non-metal Chemistry (030205)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Elsevier B.V.
Copyright Statement: This is the author’s version of a work that was accepted for publication in Sensors and Actuators B : Chemical. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Sensors and Actuators B : Chemical, [VOL 117, 2012] DOI: 10.1016/j.snb.2012.11.013
Deposited On: 15 Jan 2013 23:39
Last Modified: 12 Jun 2013 15:27

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