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Sensors 2015, 15(4), 9563-9581; doi:10.3390/s150409563

A Study of a QCM Sensor Based on TiO2 Nanostructures for the Detection of NO2 and Explosives Vapours in Air

1
Department of Optoelectronics, Silesian University of Technology, 2 Akademicka St., 44-100 Gliwice, Poland
2
Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, 9 Strzody St., 44-100 Gliwice, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 11 February 2015 / Revised: 12 April 2015 / Accepted: 14 April 2015 / Published: 22 April 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
View Full-Text   |   Download PDF [3186 KB, uploaded 22 April 2015]   |  

Abstract

The paper deals with investigations concerning the construction of sensors based on a quartz crystal microbalance (QCM) containing a TiO2 nanostructures sensor layer. A chemical method of synthesizing these nanostructures is presented. The prepared prototype of the QCM sensing system, as well as the results of tests for detecting low NO2 concentrations in an atmosphere of synthetic air have been described. The constructed NO2 sensors operate at room temperature, which is a great advantage, because resistance sensors based on wide gap semiconductors often require much higher operation temperatures, sometimes as high as 500 °C. The sensors constructed by the authors can be used, among other applications, in medical and chemical diagnostics, and also for the purpose of detecting explosive vapours. Reactions of the sensor to nitroglycerine vapours are presented as an example of its application. The influence of humidity on the operation of the sensor was studied. View Full-Text
Keywords: gas sensors; Quartz Crystal Microbalance (QCM); nanoparticles; titanium dioxide (TiO2); NO2 detection; nitroglycerine detection gas sensors; Quartz Crystal Microbalance (QCM); nanoparticles; titanium dioxide (TiO2); NO2 detection; nitroglycerine detection
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Procek, M.; Stolarczyk, A.; Pustelny, T.; Maciak, E. A Study of a QCM Sensor Based on TiO2 Nanostructures for the Detection of NO2 and Explosives Vapours in Air. Sensors 2015, 15, 9563-9581.

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