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An Ion‐In‐Conjugation‐Boosted Organic Semiconductor Gas Sensor Operating at High Temperature and Immune to Moisture
Author(s) -
Yu Chuang,
He JingHui,
Cheng XueFeng,
Lin HongZhen,
Yu Haitao,
Lu JianMei
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202104721
Subject(s) - relative humidity , intermolecular force , humidity , ion , moisture , chemistry , polymer , organic semiconductor , detection limit , selectivity , semiconductor , chemical engineering , analytical chemistry (journal) , materials science , nanotechnology , optoelectronics , molecule , organic chemistry , chromatography , thermodynamics , catalysis , physics , engineering
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 NO 2 and showed the highest sensitivity (2526 ppm −1 at 40 ppb) of all reported NO 2 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 NO 2 alarm system was assembled to demonstrate the feasibility of this sensor.