Sensitivity of titania(B) nanowires to nitroaromatic and nitroamino explosives at room temperature via surface hydroxyl groups

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)7269-7273
Journal / PublicationJournal of Materials Chemistry
Volume21
Issue number20
Online published15 Apr 2011
Publication statusPublished - 28 May 2011
Externally publishedYes

Abstract

Thin films of TiO2(B) nanowires are known to have sensitive and fast response to vapors of nitro-explosives under ambient conditions. The sensing response is believed to be affected by the humidity of ambient air that changes the density of hydroxyl groups on the TiO2(B) surfaces. To verify this mechanism, the role of surface hydroxyl groups on TiO2(B) nanowires was investigated via various surface modifications. It was found that a higher density of surface hydroxyl groups will constantly enhance the chemiresistive response of TiO2(B) nanowires to the nitro-explosives vapors. These surface hydroxyl groups serve as a pathway for effective charge transfer between the nitro groups on the explosive molecules and the TiO2(B). The evidence of charge transfer complex formation between nitro groups and titanium dioxide is also confirmed by Fourier transform infrared spectroscopy. © 2011 The Royal Society of Chemistry.

Citation Format(s)

Sensitivity of titania(B) nanowires to nitroaromatic and nitroamino explosives at room temperature via surface hydroxyl groups. / Wang, Danling; Chen, Antao; Jang, Sei-Hum; Yip, Hin-Lap; Jen, Alex K.-Y.

In: Journal of Materials Chemistry, Vol. 21, No. 20, 28.05.2011, p. 7269-7273.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review