Research Article Open Access

Mathematical Modeling and Characterization of Thin Film, Narrow Gap Sensor Array Units (SAU)

Mahmoud Z. Iskandarani1
  • 1 ,
American Journal of Applied Sciences
Volume 7 No. 9, 2010, 1277-1284

DOI: https://doi.org/10.3844/ajassp.2010.1277.1284

Submitted On: 2 September 2010 Published On: 30 September 2010

How to Cite: Iskandarani, M. Z. (2010). Mathematical Modeling and Characterization of Thin Film, Narrow Gap Sensor Array Units (SAU). American Journal of Applied Sciences, 7(9), 1277-1284. https://doi.org/10.3844/ajassp.2010.1277.1284

Abstract

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.

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Keywords

  • Electronic nose
  • mathematical modeling
  • phthalocyanine
  • thin film
  • conductivity
  • sensor arrays
  • biometrics
  • sensor array units