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nalysis of the Thick Film Deposited on Alumina Substrate and Effect of Different Parameters on the Response of Propanol Using Taguchi Method
Keywords: gas sensor, materials, fabrication
d It is well known that the gas sensor fabrication condition is affected by various parameters, such as the sensing materials, the amount of additive materials and several fabrication conditions. The goal of study of these parameters is to increase the sensitivity of the measurement system by reducing its variability. It is important that measurement systems provide an accurate and robust performance over a wide range of input conditions. Under these conditions, the system is said to have a robust design. However, the need for cost effective, sensitive and selective gas sensors led to the use of Taguchi methods to select the optimum sensor and its condition. Robust design gives us the tools to minimize the effects of chance and to maximize control of our process or experiments. This work deals with the effect of some factors on the response of the various composition of sensors to propanol. In this study the sensors were deposited on alumina substrates with copper thin film electrodes. The results were confirmed using two statistical methods, namely, analysis of mean (ANOM) and analysis of variances (ANOVA). The above results were explained by the percolation theory. Percolation theory reported that increasing the amount of the conducting filler in the polymer matrix led to the decrease in the resistivity of each composition and changed the resistance of the films from an insulator to a semiconductor. The study also includes the investigation and analysis of some important changes that occurred in the films morphology and effects of different factors on this change. The conduction mechanism of the films is examined and found to obey the Poole-Frenkel conduction mechanism.
ibrahim Gaidan,
Sirte, 054

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