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ZnO functionalization of multiwalled carbon nanotubes for methane sensing at single parts per million concentration levels

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posted on 13.08.2016 by MT Humayun, R Divan, L Stan, A Gupta, D Rosenmann, L Gundel, PA Solomon, I Paprotny
This paper presents a novel atomic layer deposition (ALD) based ZnO functionalization of surface pretreated multiwalled carbon nanotubes (MWCNTs) for highly sensitive methane chemoresistive sensors. The temperature optimization of the ALD process leads to enhanced ZnO nanoparticle functionalization and improvement in their crystalline quality as shown by energy dispersive x-ray and Raman spectroscopy. The behavior of ZnO–MWCNT sensors in presence of methane concentrations down to 2 ppm level has been compared with that of pristine MWCNTs demonstrating that ZnO functionalization is an essential factor behind the highly sensitive chemoresistive nature of the ZnO–MWCNT heterostructures. The sensor is currently being tested under a range of conditions that include potentially interfering gases and changes to relative humidity.

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Funding

Supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. College of Engineering, University of Illinois, Chicago, IL, in part funded the project.

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Publisher Statement

This is the copy of an article published in the Journal of Vacuum Science and Technology B © 2015 American Institute of Physics.

Publisher

American Institute of Physics

issn

2166-2746

Issue date

01/11/2015

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