Poly (3-hexylthiophene) and hexafluoro-2-propanol-substituted polysiloxane based OFETs as a sensor for explosive vapor detection

Dudhe, Ravishankar S. ; Sinha, Jasmine ; Sutar, D. S. ; Kumar, Anil ; Ramgopal Rao, V. (2011) Poly (3-hexylthiophene) and hexafluoro-2-propanol-substituted polysiloxane based OFETs as a sensor for explosive vapor detection Sensors and Actuators A: Physical . ISSN 0924-4247

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09244...

Related URL: http://dx.doi.org/10.1016/j.sna.2011.01.021

Abstract

The organic field effect transistors (OFETs) with regioregular poly 3-hexylthiophene (rr-P3HT) and hexafluoro-2-propanol-substituted polysiloxane (SXFA) as an organic layer, have been used for detection of explosive vapors with excellent sensitivity of less than 70 ppt for 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) and less than 100 ppt for 2,4,6-trinitrotoluene (TNT). The sensor response (% change in saturation current) was found to be 125±10% for TNT and 90±10% for RDX. It was also observed that the incorporation of CuII tetraphenylporphyrin (CuTPP) into rr-P3HT/SXFA matrix resulted in an improved selectivity for the vapors of nitro based analytes (TNT, RDX and DNB) as compared to the vapors of non explosive oxidizing agents such as nitrobenzene (NB), benzoquinone (BQ) and benzophenone (BP). This is attributed to the increased binding of the vapors containing nitro compound to the thin films due to the presence of CuTTP. Spin coated thin films were further characterized by Atomic Force Microscopy (AFM) and Electrostatic Force Microscopy (EFM).

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:OFET; Explosives; Sensor; SXFA; CuTTP; rr-P3HT
ID Code:41523
Deposited On:30 May 2011 07:06
Last Modified:30 May 2011 07:06

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