期刊
SMALL
卷 15, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201803896
关键词
ion-dipole attraction; ion-in-conjugation; nitric dioxide sensors; ppb; zwitterionic
类别
资金
- National Natural Science Foundation of China [21176164, 21336005, 216 03158]
- major research project of Jiangsu Province office of Education [15KJA150008]
- Chinese-Singapore Joint Project [2012DFG41900]
- Suzhou Science and Technology Bureau Project [SYG201524]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Nitrogen dioxide (NO2) emission has severe impact on human health and the ecological environment and effective monitoring of NO2 requires the detection limit (limit of detection) of several parts-per-billion (ppb). All organic semiconductor-based NO2 sensors fail to reach such a level. In this work, using an ion-in-conjugation inspired-polymer (poly(3,3 '-diaminobenzidine-squarine, noted as PDBS) as the sensory material, NO2 can be detected as low as 1 ppb, which is the lowest among all reported organic NO2 sensors. In addition, the sensor has high sensitivity, good reversibility, and long-time stability with a period longer than 120 d. Theoretical calculations reveal that PDBS offers unreacted amine and zwitterionic groups, which can offer both the H-bonding and ion-dipole interaction to NO2. The moderate binding energies (approximate to 0.6 eV) offer high sensitivity, selectivity as well as good reversibility. The results demonstrate that the ion-in-conjugation can be employed to greatly improve sensitivity and selectivity in organic gas sensors by inducing both H-bonding and ion-dipole attraction.
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