Mathematical Modeling and Characterization of Thin Film, Narrow Gap Sensor Array Units (SAU)
Mahmoud Z. Iskandarani
DOI : 10.3844/ajassp.2010.1277.1284
American Journal of Applied Sciences
Volume 7, Issue 9
Design, modeling, testing and analysis multi-gap PbPc sensor array units for the purpose of gas detection are carried out. The tested devices showed reduction in conductance as a function of increasing gap width and reducing film thickness and an increase as a function of temperature up to 160°C. An observed morphological change in the sublimed film is realized at 190°C as the conductance of the sensor array started to drop. Analytical modeling using semi-infinite coplanar electrode arrangement supported the obtained testing results. Problem statement: Stability in gas detection and subsequent discrimination is closely related to sensor design and test parameter and its response to an applied set of chemicals. Approach: To enhance sensor performance and improve sensor designs, a suggested design with mathematical analysis and gas response analysis is carried out. Results: A solid analytical mathematical model is established with both electric field and conductance equations. Effect of deposited sensor film thickness and inter-electrode separation on its response is also established and proved through practical test data. Conclusion: The obtained experimental results agree with the derived mathematical solutions.
© 2010 Mahmoud Z. Iskandarani. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.