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Sensors 2013, 13(3), 3765-3775; doi:10.3390/s130303765

A Dibutyl Phthalate Sensor Based on a Nanofiber Polyaniline Coated Quartz Crystal Monitor

1
National Laboratory of Industrial Control Technology, Institute of Cyber-Systems and Control, Zhejiang University, Hangzhou 310027, China
2
School of Environmental and Material Engineering, Center of Advanced Functional Materials, Yantai University, Yantai 264005, China
3
Computer Learning Research Centre, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
*
Author to whom correspondence should be addressed.
Received: 1 February 2013 / Revised: 27 February 2013 / Accepted: 8 March 2013 / Published: 18 March 2013
(This article belongs to the Section Chemical Sensors)
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Abstract

Dibutyl phthalate (DBP) is a commonly used plasticizer and additive to adhesives, printing inks and nail polishes. Because it has been found to be a powerful reproductive and developmental toxicant, a sensor to monitor DBP in some working spaces and the environment is required. In this work polyaniline nanofibers were deposited on the electrode of a quartz crystal oscillator to form a Quartz Crystal Microbalance gas sensor. The coated quartz crystal and a non-coated quartz crystal were mounted in a sealed chamber, and their frequency difference was monitored. When DBP vapor was injected into the chamber, gas adsorption decreased the frequency of the coated quartz crystal oscillator and thereby caused an increase in the frequency difference between the two crystals. The change of the frequency difference was recorded as the sensor response. The sensor was extremely sensitive to DBP and could be easily recovered by N2 purging. A low measurement limit of 20 ppb was achieved. The morphologies of the polyaniline films prepared by different approaches have been studied by SEM and BET. How the nanofiber-structure can improve the sensitivity and stability is discussed, while its selectivity and long-term stability were investigated. View Full-Text
Keywords: QCM; gas sensor; dibutyl phthalate; nanofiber; polyaniline QCM; gas sensor; dibutyl phthalate; nanofiber; polyaniline
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Wang, Y.; Ding, P.; Hu, R.; Zhang, J.; Ma, X.; Luo, Z.; Li, G. A Dibutyl Phthalate Sensor Based on a Nanofiber Polyaniline Coated Quartz Crystal Monitor. Sensors 2013, 13, 3765-3775.

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