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Sensors 2007, 7(9), 1871-1886; doi:10.3390/s7091871

Electrodeposited and Sol-gel Precipitated p-type SrTi1-xFexO3-δ Semiconductors for Gas Sensing

1,* , 2
1 Functional Materials, University of Bayreuth, Universitätsstr. 30, D-95447 Bayreuth, Germany 2 Department of Materials Science and Engineering, SUNY at Stony Brook, Stony Brook, NY 11794-2275, USA
* Author to whom correspondence should be addressed.
Received: 9 August 2007 / Accepted: 8 September 2007 / Published: 7 September 2007
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In the present contribution, three methods for the preparation of nanoscaledSrTi1-xFexO3-δ sensor films for hydrocarbon sensing were investigated. Besides screen-printed thick films based on sol-precipitated nanopowders, two novel synthesis methods,electrospinning and electrospraying, were tested successfully. All of these sensor devicesshowed improved sensor functionality in comparison to conventional microscaled thickfilms. In order to explain the impact of the enhanced surface-to-volume ratio on sensorproperties in a quantitative way, a mechanistic model was applied to micro- and nanoscaleddevices. In contrast to the conventional diffusion-reaction model that has been proposed forn-type semiconducting sensors, it contained novel approaches with respect to themicroscopic mechanism. With very few fit variables, the present model was found torepresent well sensor functionality of p-type conducting SrTi0.8Fe0.2O3-δ films. In additionto the temperature dependency of the sensor response, the effect of the specific surface areaon the sensor response was predicted.
Keywords: electrospinning; electrospraying; sol-precipitation; p-type semiconductor electrospinning; electrospraying; sol-precipitation; p-type semiconductor
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Sahner, K.; Gouma, P.; Moos, R. Electrodeposited and Sol-gel Precipitated p-type SrTi1-xFexO3-δ Semiconductors for Gas Sensing. Sensors 2007, 7, 1871-1886.

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