Improved electrical properties of chitosan based acetone sensor by adding carboxymethylcellulose (CMC)

Abstract

The acetone sensors based on chitosan have been successfully fabricated using an electrochemical deposition method. The physical and electrical characterizations of chitosan film were carried out to observe the performance of the sensor. The results showed that the chitosan based acetone sensors exhibited fast response, complete recovery and good stability. However, the improvement of chitosan films is still necessary due to the poor surface, low repeatability and reproducibility. Therefore, the objective of this study is to modify chitosan film performance by adding CMC into chitosan solution with the variation of 0.01, 0.05, 0.1 and 0.5 g. The characterization of chitosan and chitosan-CMC films were investigated using PSA, optic microscope, DTA and FTIR. While the electrical properties were observed by exposing the sensors to acetone gas for various concentrations. The results showed that acetone sensor based on chitosan-0.05 w/v CMC has the best physical and electrical properties such as homogenous surface, high thermal property, fast response, complete recovery, good repeatability and excellent reproducibility. Thus, the addition of CMC can improve the performance of chitosan based acetone sensors.