Advanced Organic Transistor-based Sensor utilizing Solvatochromic Medium with Twisted Intramolecular Charge-Transfer Behavior and Its Application to Ammonia Gas Detection
발표자
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초록
내용
Here, we designed and developed an organic field-effect transistor(OFET)-based gas sensor by applying solvatochromic dye(Nile red, NR) withtwisted intramolecular charge-transfer(TICT) behavior depending on the polarity of the surrounding molecules, as an auxiliary NR sensingmedium(aNR-SM). Using this characteristic, the NR was applied as an auxiliary sensing medium to the OFET for detecting ammonia (NH3), arepresentative toxic gas. The Top-NR case, where the aNR-SM covers only the top of the organic semiconductor layer, showed the best gas sensingperformance, and its response and recovery rate were improved by 46 and 94 %, respectively, compared to the pristine case. Our result not onlyimproved the sensing performance of the OFET-based sensor but also made an important advance in that the reliability of the sensing performancewas easily secured by applying solvatochromic and TICT behavior of an auxiliary sensing medium.