Investigation of graphene composite based gas sensor for E-nose application

• Main Author: Zainal, Nurbaya
• Format: Thesis
• Language: English
• Published: 2012
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/id/eprint/32200/1/NurbayaZainalMFKE2012.pdf; http://eprints.utm.my/id/eprint/32200/; http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:68006?site_name=Restricted Repository

Serious studies have been made on how to improve the performance of enose system. This is typically based on the chemo resistive sensor which mainly depends on the sensing material. These factor leads to the era of searching new sensing material which can give contribution to e-nose system. The previous studies had gone through a lot on the various type polymer composites that give significant attribute on air quality monitoring system. Then, the studies continued to carbon black-polymer composition for the need of optimizing the gas sensor performance. In searching a new composite as sensing material, graphene is said one of the potential conductive materials indeed can replace carbon black in future. Thus, this project introduces graphene-carbon black-polymer composite investigation with different weight of percentage based on 80:20 ratios that represents the polymers to conductive material ratio. The interest part is without carbon black existence in the composite could give a major distribution on new composite based gas sensor development. Apart from that, a spray coating technique is performed to deposit the material onto the electrode sensor. It being used because it need to be deposited individually and hence this method is suitable in this project. The resistance value must be monitored throughout the deposition process which provides the sensor within specified range. This direct to the how the sensor react to the sample in such a way the sensor arrays with high range of resistance will give high magnitude response to the sample and vice versa. This project purposely only covers on the three samples having same concentration which lies on different aromas; apple, lemon, and rose. It shows that, magnitude response diversity in this project is going to be proposed as a based gas sensor for e-nose application. Therefore, graphene composite is said has a potential as a sensing material in this area of work.