Micro Semiconductor CO Sensors Based on Indium-Doped Tin Dioxide Nanocrystalline Powders

doi:10.3390/s6050526

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Sensors 2006, 6(5), 526-535; doi:10.3390/s6050526

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Micro Semiconductor CO Sensors Based on Indium-Doped Tin Dioxide Nanocrystalline Powders

Il J. Kim ¹^,* , Sang D. Han ²^,* , Chi H. Han ² , Jihye Gwak ² , Hi D. Lee ¹ and Jin S. Wang ¹

¹ Department of Electronics Engineering, Chungnam National University, Daejeon, South Korea ² Optic and Electric Materials Center, Korea Institute of Energy Research, Daejeon, South Korea

* Authors to whom correspondence should be addressed.

Received: 10 March 2006 / Accepted: 10 May 2006 / Published: 10 May 2006

(This article belongs to the Special Issue Gas Sensors)

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Abstract: The precursors of SnO₂ or In₂O₃/SnO₂ nanocrystlline powders have been prepared bythe sol-precipitation method. The precursors were calcined at different temperatures to prepareSnO₂ or In₂O₃/SnO₂ nanocrystalline powders with different particle sizes. The nanocrystalliteswere examined by differential thermal analysis (DTA), X-ray diffraction (XRD) andtransmission electron microscopy (TEM). And then thick film CO sensors were fabricated usingprepared SnO₂ or In₂O₃/SnO₂ nanocrystlline powders loaded with PdO_x. The composition thatgave the highest sensitivity for CO was in the weight% ratio of 5 wt.% In₂O₃/SnO₂:PdO_x as99:1(wt %). The composite material was found sensitive against CO at the working temperature200 °C. It was found that the sensors based on In₂O₃/SnO₂ nanocrystalline system exhibitedvery short response time to CO at ppm level. These characteristics make the sensor to be apromising candidate for detecting low concentrations of CO.

Keywords: Micro CO gas sensor; indium oxide; nanocrystalline powders; tin dioxide.

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MDPI and ACS Style

Kim, I.J.; Han, S.D.; Han, C.H.; Gwak, J.; Lee, H.D.; Wang, J.S. Micro Semiconductor CO Sensors Based on Indium-Doped Tin Dioxide Nanocrystalline Powders. Sensors 2006, 6, 526-535.

AMA Style

Kim I.J., Han S.D., Han C.H., Gwak J., Lee H.D., Wang J.S. Micro Semiconductor CO Sensors Based on Indium-Doped Tin Dioxide Nanocrystalline Powders. Sensors. 2006; 6(5):526-535.

Chicago/Turabian Style

Kim, Il J.; Han, Sang D.; Han, Chi H.; Gwak, Jihye; Lee, Hi D.; Wang, Jin S. 2006. "Micro Semiconductor CO Sensors Based on Indium-Doped Tin Dioxide Nanocrystalline Powders." Sensors 6, no. 5: 526-535.

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