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Durham University

Department of Engineering

Staff Profile

Publication details for Professor Michael Petty

Ritjareonwattu, S, Yun, Y, Pearson, C & Petty, MC (2010). Enhanced sensitivity of an organic field-effect transistor pH sensor using a fatty acid Langmuir-Blodgett film. Organic Electronics 11(11): 1792-1795.

Author(s) from Durham


An ion-sensitive organic field-effect transistor (ISOFET) has been fabricated by using poly(3-hexylthiophene) as the semiconductor and polymethylmethacrylate as the gate insulator. With the gate metallization replaced by an Ag/AgCl reference electrode, and following suitable encapsulation, the ISOFETs exhibit transistor behavior in an aqueous environment. Moreover, the devices are shown to respond to changes in pH of the solution. A significant increase in the sensitivity of the ISOFET to H+ ions was found by depositing a Langmuir-Blodgett film of arachidic acid on top of the gate insulator. (C) 2010 Elsevier B.V. All rights reserved.