Fabrication of thick film gas sensor for gas sensing application

Noor, Muhammad Luqman Hakkim (2022) Fabrication of thick film gas sensor for gas sensing application. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

A sensor is an analytical equipment made up of a signal transducer and an active sensing substance. It detects changes in its surroundings and transmits the data or signal to other electronic devices for analysis. Gas sensors, on the other hand, have been used to monitor air quality and the environment, as well as to identify dangerous substances. There are many different types of harmful gases, such as volatile organic chemicals (VOC). VOCs are toxic chemicals that are released into the atmosphere as gases from certain solids or liquids, and some of them can cause short- and long-term health problems. VOCs have become commonplace in a wide range of products and materials. The fabrication of a thick film gas sensor for gas detecting applications is discussed in this paper. Graphene is a material with a huge specific surface area and excellent conductivity. These characteristics make it perfect for gas sensor applications. The first objective is to use screen printing and doctor blade techniques to make the thick film gas sensor. The next objective is to assess the constructed gas sensor's performance against VOC gases in terms of sensitivity, response time, and recovery time. The gas sensor will be able to detect three various types of volatile organic compound (VOC) gases at the conclusion of this project, including acetone and ethanol. As the result, the sample of standard graphene paste combination of 95 wt% binder and 5 wt% graphene powder have a good result. Secondly, the sample SK(G)-1 and SG(G0)-1 shown response time of the gas sensor to the targeted gases ethanol shows that the sensor can produce accurate results than on acetone. It is because the sensitivity is 2.00 higher than other samples. Following that, the IV characteristics on the doctor blade's breakdown voltage minimum of 2 volts. However, most the doctor blade sample on standard binder or linseed oil with binder not showing the expected result because the graph can’t have recovery well and the sensitivity less than 1.

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