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Journal of Sensors
Volume 2016, Article ID 8539169, 7 pages
Research Article

Hexanal Gas Detection Using Chitosan Biopolymer as Sensing Material at Room Temperature

1School of Materials Engineering, Universiti Malaysia Perlis, 01000 Kangar, Perlis, Malaysia
2Physics Department, Faculty of Mathematic and Natural Science, University of Sumatera Utara, Medan, Sumatera Utara 20155, Indonesia

Received 30 August 2015; Revised 30 November 2015; Accepted 13 December 2015

Academic Editor: Elisabetta Comini

Copyright © 2016 Devi Shantini et al. 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.


Hexanal was identified as one of the major volatile gases which are produced in degraded dairy products and wood industries. Therefore, preliminary study on hexanal gas detection with the laboratory scale was carried out in this paper. Electrical testing with chitosan as a sensing material to sense hexanal gas in low concentration was carried out at room temperature. Chitosan sensor was fabricated by using electrochemical deposition technique to form active sensing layer. The response of the chitosan film sensor (CFS) towards hexanal was tested via electrical testing by exposing different hexanal concentrations ranging between 20 ppm, 100 ppm, 200 ppm, and 300 ppm using air as a carrier gas. Sensing properties of the CFS toward hexanal exposure including responsibility, recovery, repeatability, stability, and selectively were studied. Overall, our result suggested that hexanal sensor based on chitosan was able to perform well at room temperature demonstrated by good response, good recovery, good repeatability, good stability, and good selectively. This simple and low cost sensor has high potential to be utilized in early quality degradation detection in dairy products and can be used to monitor the level of hexanal exposure in wood industries.