Highly Sensitive Room-Temperature Ammonia Sensors Based on Single-Wall Carbon Nanotubes Modified by PEDOT

0555107 - ÚFCH JH 2023 RIV US eng J - Journal Article
Stulík, J. - Šlauf, J. - Polanský, R. - Mergl, M. - Kalbáč, Martin
Highly Sensitive Room-Temperature Ammonia Sensors Based on Single-Wall Carbon Nanotubes Modified by PEDOT.
IEEE Sensors Journal. Roč. 22, č. 4 (2022), s. 3024-3032. ISSN 1530-437X. E-ISSN 1558-1748
R&D Projects: GA MŠMT EF16_026/0008382
Grant - others:Ministerstvo školství, mládeže a tělovýchovy - GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_026/0008382
Institutional support: RVO:61388955
Keywords : gas sensors * polymers * bundles * device * film * nh3 * pss * Sensors * Ammonia * Temperature sensors * Carbon nanotubes * Gas detectors * Dispersion * Solvents * pedot * carbon nanotubes * sulfonic group * ammonia * gas sensor
OECD category: Physical chemistry
Impact factor: 4.3, year: 2022
Method of publishing: Limited access
https://ieeexplore.ieee.org/document/9678311

An ammonia gas sensor material based on sulf- onic functionalized single-wall carbon nanotubes modified by poly(3,4-ethylenedioxythiophene), namely, PEDOT/SWCNT-SO3H, was prepared via in situ polymerization. A thin active layer of PEDOT/SWCNT-SO3H was deposited on a polyimide substrate with interdigital electrodes by air-brush spray coating. The morphology of the prepared material was studied by scanning electron microscopy, and the presence of PEDOT in the structure of SWCNT-SO3H was examined with Raman spectroscopy. The obtained results showed that PEDOT was successfully bound to SWCNT-SO3H and that this modification significantly improved the NH3 sensing performance of the sensor. The sensor exhibited a strong response to ammonia (102% at 50 ppm), minimal drift in the electrical resistance during cyclic exposure, and good spontaneous desorption, all at room temperature. In the range from 20 ppm to 100 ppm ammonia, the calibration curve is considered linear, with a sensitivity of a 0.7% resistance change per 1 ppm ammonia. Furthermore, the sensor shows the ability to detect ammonia at sub-ppm concentration, and the response is 4.4% at 300 ppb. With regard to the material structure, the sensing mechanisms of both materials, i.e., PEDOT/SWCNT-SO3H and SWCNT-SO3H, are discussed in the article.
Permanent Link: http://hdl.handle.net/11104/0329954