University of Oulu

Zhou, J., Järvinen, T., Pitkänen, O., Kónya, Z., Kukovecz, A., & Kordas, K. (2021). Composites of ion-in-conjugation polysquaraine and SWCNTs for the detection of H2S and NH3 at ppb concentrations. In Nanotechnology (Vol. 32, Issue 18, p. 185502). IOP Publishing.

Composites of ion-in-conjugation polysquaraine and SWCNTs for the detection of H2S and NH3 at ppb concentrations

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Author: Zhou, Jin1; Järvinen, Topias1; Pitkänen, Olli1;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FIN-90014 Oulu, Finland
2MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group of the Hungarian Academy of Sciences, Rerrich Béla tér 1, H-6720 Szeged, Hungary
3Interdisciplinary Excellence Centre, Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, Hungary
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.6 MB)
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Language: English
Published: IOP Publishing, 2021
Publish Date: 2022-02-12


Several different methods are established for the analysis of gases, including optical spectroscopy, photoacoustic spectroscopy as well as colorimetric and resistive sensing, the measurements systems are either too complex or have limited sensitivity. In particular, when the goal is to apply a large number of sensors in networks, it is highly desirable to have devices that are simple, have low cost and energy consumption, yet sensitive and selective to monitor analytes even in traces. Herein, we propose a new type of resistive sensor device based on a composite of single-wall carbon nanotubes and an ion-in-conjugation polymer, poly(1,5-diaminonaphthalene-squaraine), capable of detecting H2S and NH3 in air even at room temperature with a theoretical concentration limit of ∼1 ppb and ∼7 ppb, respectively. Density functional theory calculations revealed that H atoms of the analytes and O atoms of the polymer chain interact and form hydrogen bonds, and the electron withdrawal from the gas molecules by the polymer chain results in the change of its electrical conductivity. To demonstrate the feasibility of the new nanocomposites in sensing, we show the devices for monitoring food safety with good sensor stability of operation for at least 3 months of period of time.

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Series: Nanotechnology
ISSN: 0957-4484
ISSN-E: 1361-6528
ISSN-L: 0957-4484
Volume: 32
Issue: 18
Article number: 185502
DOI: 10.1088/1361-6528/abdf06
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
221 Nanotechnology
Funding: This work was financially supported in part by the University of Oulu (project Entity) and the China Scholarship Council. Financial support by the Hungarian National Research, Development and Innovation Office through projects K126065 and K120115 is acknowledged. We thank the personnel of the Centre for Material Analysis at the University of Oulu for providing us with technical assistance.
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