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Morphology-driven sensitivity enhancement in organic nanowire chemiresistors

Dragoneas, Antonis, Grell, Martin, Hampton, Mark David and Macdonald, John Emyr 2013. Morphology-driven sensitivity enhancement in organic nanowire chemiresistors. Sensor Letters 11 (3) , pp. 552-555. 10.1166/sl.2013.2917

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Chemiresistors were prepared from the common organic semiconductor, poly(3-hexylthiophene) (P3HT), which is known to respond to atmospheric humidity with an increase of its conductance. Chemiresistors with different P3HT morphologies were compared: a solution-cast film versus an organic nanowire 'mesh.' It was found that both types of chemiresistors show no response for an exposure to less than 50% relative humidity. When humidity exceeds this threshold, the conductance of both chemiresistors increases. The conductance response of the nanowire device is far stronger as compared to that of the solution-cast film. This difference can be justified by the much larger surface area in the nanowire morphology. We conclude that organic nanowires constitute a favourable morphology for organic sensor technology, and recommend their wider employment in organic sensor applications.

Item Type: Article
Status: Published
Schools: Physics and Astronomy
Uncontrolled Keywords: chemiresistor; humidity sensor; moisture sensor; nanowire; P3HT; polythiopene
Publisher: American Scientific Publishers
ISSN: 1546-198X
Funders: EPSRC
Last Modified: 24 Sep 2021 01:12

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