| 초록 |
Here, we designed and developed an organic field-effect transistor(OFET)-based gas sensor by applying solvatochromic dye(Nile red, NR) with twisted intramolecular charge-transfer(TICT) behavior depending on the polarity of the surrounding molecules, as an auxiliary NR sensing medium(aNR-SM). Using this characteristic, the NR was applied as an auxiliary sensing medium to the OFET for detecting ammonia (NH3), a representative toxic gas. The Top-NR case, where the aNR-SM covers only the top of the organic semiconductor layer, showed the best gas sensing performance, and its response and recovery rate were improved by 46 and 94 %, respectively, compared to the pristine case. Our result not only improved the sensing performance of the OFET-based sensor but also made an important advance in that the reliability of the sensing performance was easily secured by applying solvatochromic and TICT behavior of an auxiliary sensing medium. |
