Abstract
High performance organic field-effect transistors (OFETs) based nitrogen dioxide (NO2) gas sensors were fabricated by using biocompatible bilayer dielectric of poly(methyl methacrylate) (PMMA) and silk fibroin (SF). Compared to those sensor devices with single PMMA dielectrics, NO2 sensing properties of the devices with PMMA/SF bilayer dielectric were significantly improved. By analyzing the electrical characteristics of the OFETs under various concentrations of NO2 systematically, it was found that the enhancement of the sensing properties of PMMA/SF based OFET-sensors was ascribed to different surface properties between PMMA and SF. The superior sensing performance is owing to the interaction between the hydroxyl and the amidogen of the SF biomaterial and NO2 molecules at the interface of dielectric/organic layer.
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