ScholarWorks@중앙대학교

초록

Organic gas sensors are highly suitable for wearable applications, such as electronic skin (e–skin), because of their light weight and flexibility. However, their relatively low sensitivity and inferior air stability compared with those of inorganic gas sensors remain significant challenges. Herein, we report an organic–inorganic hybrid gas sensor fabricated by blending poly(3–hexylthiophene) (P3HT) with CsPbBr3 perovskite quantum dots (PQDs) functionalized with 7–aminoheptanoic acid (AHA) ligands. The zwitterionic AHA, which contains both amine and carboxyl groups, effectively passivates surface defects in CsPbBr3 PQD and provides gas-adsorption sites for NO2 molecules, thus improving charge transport and gas-sensing capability. The 3% AHA sensor exhibited a field–effect mobility of 0.03 cm2 V−1 s−1 and a six-fold improvement in NO2 sensitivity (0.019) compared with homo P3HT, in addition to a low detection limit of 0.013 ppm. Moreover, the AHA–modified CsPbBr3 PQD improved air stability by suppressing oxidation and moisture penetration, with a recovery rate of approximately 50% achieved after 21 d under ambient conditions. These results indicate the potential of surface-ligand-engineered perovskite/polymer hybrids as a promising strategy for fabricating high-performance and air-stable organic gas sensors for next-generation wearable electronics.

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