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12 September 2007 Enhanced chemical sensing organic thin-film transistors
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Organic thin film transistor (OTFT) sensors are capable of fast, sensitive and reliable detection of a variety of analytes. They have been successfully tested towards many chemical and biological "odor" molecules showing high selectivity, and displaying the additional advantage of being compatible with plastic technologies. Their versatility is based on the possibility to control the device properties, from molecular design up to device architecture. Here phenylene-thiophene based organic semiconductors functionalized with ad hoc chosen side groups are used as active layers in sensing OTFTs. These materials, indeed, combine the detection capability of organic molecules (particularly in the case of bio-substituted systems) with the electronic properties of the conjugated backbone. A new OTFT structure including Langmuir-Schäfer layer by layer organic thin films is here proposed to perform chemical detection of organic vapors, including vapor phase chiral molecules such as citronellol vapors, with a detection limit in the ppm range. Thermally evaporated α6T based OTFT sensors are used as well to be employed as standard system in order to compare sensors performances.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. C. Tanese, L. Torsi, G. M. Farinola, L. Valli, O. Hassan Omar, G. Giancane, E. Ieva, F. Babudri, F. Palmisano, F. Naso, and P. G. Zambonin "Enhanced chemical sensing organic thin-film transistors", Proc. SPIE 6659, Organic-based Chemical and Biological Sensors, 66590A (12 September 2007);

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