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The Effects of Two Thick Film Deposition Methods on Tin Dioxide Gas Sensor Performance
Department of Mechanical Engineering, Rowan University / 201 Mullica Hill Road, Glassboro, NJ 08028, USA
Department of Mechanical Engineering, University of Michigan / 2350 Hayward Street, Ann Arbor, MI 48109, USA
* Author to whom correspondence should be addressed.
Received: 30 June 2009; in revised form: 26 August 2009 / Accepted: 27 August 2009 / Published: 31 August 2009
Abstract: This work demonstrates the variability in performance between SnO2 thick film gas sensors prepared using two types of film deposition methods. SnO2 powders were deposited on sensor platforms with and without the use of binders. Three commonly utilized binder recipes were investigated, and a new binder-less deposition procedure was developed and characterized. The binder recipes yielded sensors with poor film uniformity and poor structural integrity, compared to the binder-less deposition method. Sensor performance at a fixed operating temperature of 330 ºC for the different film deposition methods was evaluated by exposure to 500 ppm of the target gas carbon monoxide. A consequence of the poor film structure, large variability and poor signal properties were observed with the sensors fabricated using binders. Specifically, the sensors created using the binder recipes yielded sensor responses that varied widely (e.g., S = 5 – 20), often with hysteresis in the sensor signal. Repeatable and high quality performance was observed for the sensors prepared using the binder-less dispersion-drop method with good sensor response upon exposure to 500 ppm CO (S = 4.0) at an operating temperature of 330 ºC, low standard deviation to the sensor response (±0.35) and no signal hysteresis.
Keywords: SnO2; gas sensor; fabrication; combustion; deposition; film; binder
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MDPI and ACS Style
Bakrania, S.D.; Wooldridge, M.S. The Effects of Two Thick Film Deposition Methods on Tin Dioxide Gas Sensor Performance. Sensors 2009, 9, 6853-6868.
Bakrania SD, Wooldridge MS. The Effects of Two Thick Film Deposition Methods on Tin Dioxide Gas Sensor Performance. Sensors. 2009; 9(9):6853-6868.
Bakrania, Smitesh D.; Wooldridge, Margaret S. 2009. "The Effects of Two Thick Film Deposition Methods on Tin Dioxide Gas Sensor Performance." Sensors 9, no. 9: 6853-6868.