Polythiophene thin-film transistor array for gas sensing

A small array of various polythiophene derivative OTF' gas sensors with robust operation in air is demonstrated. Air stability is shown not to preclude gas sensor response, and good sensitivity to a range of gas analytes is observed down to 10 ppm. The active materials are all deposited from solution, making these sensors compatible with low-cost gas sensor arrays. Finally, the effect of varying the functional groups and size of a gas analyte on the response it induces in the sensor array is investigated.