An Ion-In-Conjugation-Boosted Organic Semiconductor Gas Sensor Operating at High Temperature and Immune to Moisture
Chuang Yu1, Jing-Hui He1, Xue-Feng Cheng1, Hong-Zhen Lin2, Haitao Yu3, and Jian-Mei Lu1,*（路建美）
1College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Centre of Suzhou Nano Science and Technology, National United Engineering Laboratory of Functionalized Environmental Adsorption Materials，Soochow University，Suzhou 215123 (P. R. China)
2Department i-LAB, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences，Suzhou 215123 (P. R. China)
3State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences，865 Changning Road, Shanghai 200050 (China)
Angew. Chem. Int. Ed. 2021, 60, 15328--15334
Organic electrical gas sensors have been developed for many decades because of their high sensitivity and selectivity. However, their industrialization is severely hindered by their intrinsic humidity susceptibility and poor recovery. Conventional organic sensory materials can only operate at room temperature owing to their weak intermolecular interactions. Herein, we demonstrate using a croconate polymer (poly-4,4′-biphenylcroconate) that the “ion-in-conjugation” concept enables organic gas sensors to operate at 100 °C and 70 % relative humidity with almost complete recovery. The fabricated sensor had a parts-per-billion (ppb) detection limit for NO2 and showed the highest sensitivity (2526 ppm−1 at 40 ppb) of all reported NO2 chemiresistive sensors. Furthermore, charge transfer increased with temperature. Theoretical calculations and in situ FTIR spectra confirmed the ion-in-conjugation-inspired hydrogen bond as key for excellent sensitivity. A NO2 alarm system was assembled to demonstrate the feasibility of this sensor.
链接：https://onlinelibrary.wiley.com/doi/full/10.1002/anie.202104721
