Abstract
In this study we developed organic thin film transistors (OTFTs) for the sensing of metal ions and anions through the self-assembly of a pentacene/Schiff base pyrene derivative. Our bilayer OTFTs displayed attractive device parameters: an electron mobility (μ) of 0.12cm2V−1s−1, a threshold voltage (Vth) of 22.20V, and a five-orders-of-magnitude on/off ratio. This device was sensitive toward Cu2+ among 13 metal cations and toward CN− among nine anions, as measured through changes in the values of Vth and Ioff in the presence of Cu2+ cations and a change in the value of Isat in the presence of CN− anions. We observed selectivity toward both of these ions in mixed ion solutions, with sensitivity over different concentrations (from 20 to 350μM for Cu2+; from 100 to 350μM for CN−) as well as in sea water. The pyrene derivative self-assembled through pyrene–pyrene* coordination in the presence of Cu2+ ions; the rods of the pyrene derivative broke into smaller pieces upon formation of benzoxazole rings in the presence of CN− ions, as confirmed using atomic force microscopy and fourier transform attenuated total reflection spectroscopy.
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