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Ion-in-Conjugation Polymer Enables Detection of NO2 with Parts-Per-Trillion Sensitivity and Ultrahigh Selectivity

Abstract

Detection of nitric dioxide (NO2) at part-per-trillion (ppt) level is critical for both environmental monitoring and human health. However, none of chemiresistors could detect NO2 at the part-per-trillion (ppt) level, suffering from low sensitivity of the sensory materials. In this work, an ion-in-conjugation polymer para-polyphenylsquaraine (p-PPS) was designed and fabricated into an NO2 chemiresistor. The sensor has the highest sensitivity of 1450 ppm-1 (at 100 ppb) and the lowest detection limit of 40 ppt among all reported chemiresistors. In addition, p-PPS shows an ultrahigh selectivity that other interfering gases have less than 1/1887 of the signal to NO2 under the same concentration (10 ppm). The calculation and in-situ infrared spectra and the sum frequency generation spectra (SFG) reveal that the ion-in-conjugation inspired H-bonding between p-PPS and NO2 leads to such a high sensitivity. Our result highlighted the concept of ion-in-conjugation in design of highly sensitive gas sensory materials.

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Publication details

The article was received on 19 Oct 2019, accepted on 02 Dec 2019 and first published on 03 Dec 2019


Article type: Communication
DOI: 10.1039/C9TA11513G
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Ion-in-Conjugation Polymer Enables Detection of NO2 with Parts-Per-Trillion Sensitivity and Ultrahigh Selectivity

    C. Yu, H. Lin, J. Zhou, X. Cheng, J. He, H. Li, Q. Xu, N. Li, D. Chen and J. Lu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA11513G

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