Surface Sensitivity of Ultrasonically Treated Carbon Nanotube Network towards Ammonia

Abstract

Detection of ammonia by carbon nanotubes is an extensively studied area where tremendous progress was achieved so far in their sensing performance. In this paper, we focused on carbon nanotube network sensors of NH 3 aiming to develop better understanding of their gas detection behavior and improved sensing response. Our experiments showed improved sensing performance for single-walled carbon nanotubes of (6,5) chirality ultrasonically treated at high power and then forming bundled nanotube network upon thermal annealing. Two chemiresistive sensing pathways were observed for such networks resulting in increased and decreased resistance in presence of different ammonia concentrations from 10 2 to 10 4 ppm. This multidirectional chemiresistive response was comprehensively explained via various phenomena, such as partial and full neutralization of p-type conductivity of the nanotubes, change of the Schottky barrier, and dipoles at the interface between nanotubes and gold electrodes. The proposed sensing mechanisms are believed to provide strong support for further development of ammonia sensors with optimized performance.

Publication DOI: https://doi.org/10.1016/j.surfin.2019.100363
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences
Additional Information: © 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: Ammonia,Bundled nanotube networks,Carbon nanotubes,Sensing,Chemistry(all),Condensed Matter Physics,Physics and Astronomy(all),Surfaces and Interfaces,Surfaces, Coatings and Films
Publication ISSN: 2468-0230
Last Modified: 08 Jan 2024 09:14
Date Deposited: 31 Jul 2019 13:46
Full Text Link:
Related URLs: https://www.sci ... 3281?via%3Dihub (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Letter
Published Date: 2019-12-01
Published Online Date: 2019-07-22
Accepted Date: 2019-07-21
Authors: Lutsyk, Petro (ORCID Profile 0000-0002-7004-1946)
Shankar, Prabakaran
Rozhin, Oleksiy (ORCID Profile 0000-0003-2271-8227)
Kulinich, Sergei A.

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