Abstract
We demonstrate a cost-effective but fast multiparameter data acquisition system for odour sensors based on low threshold organic field effect transistors (OFETs) with an amorphous methoxy-derivative of poly(triaryl amine) (PTA-OMe) as semiconductor. The system applies a simple algorithm to measure OFET saturated transfer characteristics with a tailored operational amplifier circuit that is interfaced to a laptop that controls the circuit and analyses data with bespoke software. Despite the semiconductor's low charge carrier mobility mu similar to 5 x 10(-5) Vs/cm(2), the system returns multiparameter OFET data: OFET source-drain current I-SD in both the 'on' and 'off' state, carrier mobility mu, and threshold (V-T), in real time (resolution <1 s). The system is tested by exposing the OFET to a series of alcohol odours at different concentrations. Sensor response is quick, and follows a distinct trend IPA > PrOH > EtCH > MeOH. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.