High-mobility polymer field-effect transistor based-sensor array for selective discrimination between multiple isomers

Distinguishing structural isomers and stereoisomers is a critical and challenging task for biotechnology, the pharmaceutical industry and environmental monitoring. Compared to available methods, use of the high mobility copolymer benzothiadiazole- cyclopentadithiophene (CDT-BTZ) in an OFET based gas sensor can highly selectively detect different volatile organic isomers. High- accuracy discrimination has been achieved over a range of concentrations of 20-100 ppm using only one parameter of the OFET. By analyzing the OFET parameter cross- reactivity and using differential function analysis to create fingerprints for individual compounds, more significant selectivity and robust isomer detection have been achieved.