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Sensors 2009, 9(9), 6853-6868; doi:10.3390/s90906853
Article

The Effects of Two Thick Film Deposition Methods on Tin Dioxide Gas Sensor Performance

1,*  and 2
Received: 30 June 2009; in revised form: 26 August 2009 / Accepted: 27 August 2009 / Published: 31 August 2009
(This article belongs to the Special Issue Gas Sensors 2009)
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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 SnO2; gas sensor; fabrication; combustion; deposition; film; binder
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

AMA Style

Bakrania SD, Wooldridge MS. The Effects of Two Thick Film Deposition Methods on Tin Dioxide Gas Sensor Performance. Sensors. 2009; 9(9):6853-6868.

Chicago/Turabian Style

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.



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