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Title: Phthalocyanine/silica hybrid films on QCM for enhanced nitric oxide sensing
Authors: Palaniappan, Al. 
Moochhala, S.
Tay, F.E.H. 
Su, X.
Phua, N.C.L.
Keywords: Cobalt phthalocyanine
Gas sensor
Mesoporous silica
Issue Date: 29-Jan-2008
Citation: Palaniappan, Al., Moochhala, S., Tay, F.E.H., Su, X., Phua, N.C.L. (2008-01-29). Phthalocyanine/silica hybrid films on QCM for enhanced nitric oxide sensing. Sensors and Actuators, B: Chemical 129 (1) : 184-187. ScholarBank@NUS Repository.
Abstract: We have attempted to detect nitric oxide (NO) in gaseous state by immobilizing cobalt phthalocyanine (CoPc) in a mesoporous silica matrix deposited on a quartz crystal microbalance (QCM). CoPc/mesoporous silica hybrids are prepared by using thermal calcination process. Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) are used to characterize the CoPc/silica hybrids. The sensor response towards NO is tested in a sealed gas chamber. To estimate the sensitivity enhancement introduced by the mesoporous silica film, NO response of non-modified QCM and CoPc-modified QCM are also recorded. Cross-sensitivity to potential interfering analyte such as carbon monoxide (CO) is then investigated. The experiment results show that sensitivities up to 25 ppb/Hz could be achieved by using the developed CoPc/silica hybrid on QCM. © 2007 Elsevier B.V. All rights reserved.
Source Title: Sensors and Actuators, B: Chemical
ISSN: 09254005
DOI: 10.1016/j.snb.2007.07.132
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