Jump to main content
Jump to site search

Issue 3, 2020
Previous Article Next Article

An ion-in-conjugation polymer enables the detection of NO2 with parts-per-trillion sensitivity and ultrahigh selectivity

Author affiliations

Abstract

The detection of nitric dioxide (NO2) at the parts-per-trillion (ppt) level is critical for both environmental monitoring and human health. However, none of the chemiresistors reported to date can detect NO2 at the parts-per-trillion (ppt) level due to the 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 had 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 showed ultrahigh selectivity, where other interfering gases had less than 1/1887th of the signal of NO2 under the same concentration (10 ppm). Calculations, in situ infrared spectroscopy and sum frequency generation spectroscopy (SFG) revealed that the ion-in-conjugation-inspired H-bonding between p-PPS and NO2 led to such high sensitivity. Our results highlight the potential of the concept of ion-in-conjugation in the design of highly sensitive gas sensory materials.

Graphical abstract: An ion-in-conjugation polymer enables the detection of NO2 with parts-per-trillion sensitivity and ultrahigh selectivity

Back to tab navigation

Supplementary files

Article information


Submitted
19 Oct 2019
Accepted
02 Dec 2019
First published
03 Dec 2019

J. Mater. Chem. A, 2020,8, 1052-1058
Article type
Communication

An ion-in-conjugation polymer enables the 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, 2020, 8, 1052
DOI: 10.1039/C9TA11513G

Social activity

Search articles by author

Spotlight

Advertisements