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Investigation of the carbon monoxide gas sensing characteristics of tin oxide mixed cerium oxide thin films.

Durrani SM, Al-Kuhaili MF, Bakhtiari IA, Haider MB - Sensors (Basel) (2012)

Bottom Line: The films were investigated for the detection of carbon monoxide, and were found to be highly sensitive.We found that 430 °C was the optimum operating temperature for sensing CO gas at concentrations as low as 5 ppm.Our sensors exhibited fast response and recovery times of 26 s and 30 s, respectively.

View Article: PubMed Central - PubMed

Affiliation: Physics Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia. smayub@kfupm.edu.sa

ABSTRACT
Thin films of tin oxide mixed cerium oxide were grown on unheated substrates by physical vapor deposition. The films were annealed in air at 500 °C for two hours, and were characterized using X-ray photoelectron spectroscopy, atomic force microscopy and optical spectrophotometry. X-ray photoelectron spectroscopy and atomic force microscopy results reveal that the films were highly porous and porosity of our films was found to be in the range of 11.6-21.7%. The films were investigated for the detection of carbon monoxide, and were found to be highly sensitive. We found that 430 °C was the optimum operating temperature for sensing CO gas at concentrations as low as 5 ppm. Our sensors exhibited fast response and recovery times of 26 s and 30 s, respectively.

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Current responses in time of SnO2 mixed CeO2 sensors exposed to 500 ppm of CO for a film thickness of 220 nm at the optimum temperature of 430 °C.
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f9-sensors-12-02598: Current responses in time of SnO2 mixed CeO2 sensors exposed to 500 ppm of CO for a film thickness of 220 nm at the optimum temperature of 430 °C.

Mentions: Figure 9 illustrates the dynamic current response of SnO2 mixed CeO2 sensor at the optimum temperature when exposed to 500 ppm of CO mixed in dry air. It is clear from the Figure 9 that for SnO2 mixed CeO2 sensor it took 26 seconds for the current to reach to its maximum value (peak response time). The sensors recover back to their initial value within 30 seconds. Comparing these results with the same sensing parameters for pure CeO2 [10], there is significant improvement in response time and detection limit, while the operating temperature has also increased for SnO2 mixed CeO2 sensors.


Investigation of the carbon monoxide gas sensing characteristics of tin oxide mixed cerium oxide thin films.

Durrani SM, Al-Kuhaili MF, Bakhtiari IA, Haider MB - Sensors (Basel) (2012)

Current responses in time of SnO2 mixed CeO2 sensors exposed to 500 ppm of CO for a film thickness of 220 nm at the optimum temperature of 430 °C.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3376601&req=5

f9-sensors-12-02598: Current responses in time of SnO2 mixed CeO2 sensors exposed to 500 ppm of CO for a film thickness of 220 nm at the optimum temperature of 430 °C.
Mentions: Figure 9 illustrates the dynamic current response of SnO2 mixed CeO2 sensor at the optimum temperature when exposed to 500 ppm of CO mixed in dry air. It is clear from the Figure 9 that for SnO2 mixed CeO2 sensor it took 26 seconds for the current to reach to its maximum value (peak response time). The sensors recover back to their initial value within 30 seconds. Comparing these results with the same sensing parameters for pure CeO2 [10], there is significant improvement in response time and detection limit, while the operating temperature has also increased for SnO2 mixed CeO2 sensors.

Bottom Line: The films were investigated for the detection of carbon monoxide, and were found to be highly sensitive.We found that 430 °C was the optimum operating temperature for sensing CO gas at concentrations as low as 5 ppm.Our sensors exhibited fast response and recovery times of 26 s and 30 s, respectively.

View Article: PubMed Central - PubMed

Affiliation: Physics Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia. smayub@kfupm.edu.sa

ABSTRACT
Thin films of tin oxide mixed cerium oxide were grown on unheated substrates by physical vapor deposition. The films were annealed in air at 500 °C for two hours, and were characterized using X-ray photoelectron spectroscopy, atomic force microscopy and optical spectrophotometry. X-ray photoelectron spectroscopy and atomic force microscopy results reveal that the films were highly porous and porosity of our films was found to be in the range of 11.6-21.7%. The films were investigated for the detection of carbon monoxide, and were found to be highly sensitive. We found that 430 °C was the optimum operating temperature for sensing CO gas at concentrations as low as 5 ppm. Our sensors exhibited fast response and recovery times of 26 s and 30 s, respectively.

Show MeSH