| 초록 |
Fabrication of toxic chemical detectors have drawn attention for their health and environmental monitoring applications. Polymer-based sensors, solely or with additives, are the promising platforms as a sensing element. In this work, ammonia (NH3) gas sensors based on organic field-effect transistor (OFET) using poly(3-hexylthiophene) (P3HT) blended with tris(pentafluorophenyl)borane (TPFB) as an active layer were fabricated. Adding 20-40% TPFB exhibited the best performance to various concentrations of NH3. TPFB acted as a good NH3 receptor due to the strong Lewis acid-base interaction between boron and nitrogen atoms. Addition of TPFB showed an increase in the percentage current (%Id) response and mobility compared to the pristine P3HT OFETs. The %Id responses were 40.9% and 20.3% under 100 ppm and 10 ppm NH3 exposure, respectively. Furthermore, these OFETs also showed considerable selectivity with respect to dichloromethane, acetone, and methanol. |
