Organic field effect transistors based on poly(3-hexylthiophene) and CuII tetraphenylporphyrin composite were investigated as sensors for detection of vapors of nitrobased explosive compounds, viz., 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX), 2,4,6-trinitrotoluene (TNT), and dinitrobenzene, which are also strong oxidizing agents. Significant changes, suitable for sensor response, were observed in transistor "on" current (Ion) and conductance (S) after exposure. A similar device response was, however, not observed for oxidizing agents such as benzoquinone and benzophenone. The Fourier transform infrared spectrometry experiments supported the results, where exposure to RDX and TNT vapors resulted in a significant shift in IR peaks. © 2008 American Institute of Physics.

Shree Prakash Tiwari

Department of Electrical Engineering

IIT Jodhpur

R.S. Dudhe

H.N. Raval

M.A. Khaderbad

R. Singh

J. Sinha

M. Yedukondalu

M. Ravikanth

A. Kumar

V.R. Rao

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Explosive vapor sensor using poly (3-hexylthiophene) and CuII tetraphenylporphyrin composite based organic field effect transistors

Applied Physics Letters

Journal	Applied Physics Letters
ISSN	00036951