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Publisher: Elsevier
Languages: English
Types: Article
Subjects:
In this work, we report the effect of post-deposition film treatment on the NO2 sensing properties of CuPc thin films for room temperature operation. The gas-sensitive response of the electrical conductivity to doping with NO2, doping with oxygen (in air) and cooling to 77 K in liquid nitrogen are reported. The pretreatment with NO2 is shown to improve the gas sensing properties by providing both an increase in the magnitude of the conductivity change for a given NO2 concentration and a significant improvement in the recovery time. Data is analysed using an Elovich model, which suggests that the cooled devices have the best fit to this model; the data for the NO2 doped devices suggest a Langmuir behaviour. For all devices, a simple time derivative of the change in current provides a measure of concentration for real time gas sensing applications.
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    • [1] C.C.Leznoff and A.B.P.Lever Phthalocyanines, Properties and Applications 1-3 (1989) V C H publishers
    • [2] J.B.Whitlock, P.Panayotatos, G.D.Sharma, M.D.Cox, R.R.Sauers and G.R.Bird, Investigations of materials and device structures for organic semiconductor solar-cells. Optica) Engineering 32 (1993) 1921-1934 0.5 0.6 0.8
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