dc.contributor.author |
Malepe, Lesego
|
|
dc.contributor.author |
Ndinteh, Derek Tantoh
|
|
dc.contributor.author |
Ndungu, Patrick Gathura
|
|
dc.contributor.author |
Mamo, Messai Adenew
|
|
dc.date.accessioned |
2023-02-06T05:55:32Z |
|
dc.date.available |
2023-02-06T05:55:32Z |
|
dc.date.issued |
2022-09 |
|
dc.description.abstract |
Methanol vapour is harmful to human health if it is inhaled, swallowed, or absorbed through the skin. Solidstate
gas sensors are a promising system for the detection of volatile organic compounds, unfortunately,
they can have poor gas selectivity, low sensitivity, an inferior limit of detection (LOD), sensitivity towards
humidity, and a need to operate at higher temperatures. A novel solid-state gas sensor was assembled
using carbon nanoparticles (CNPs), prepared from a simple pyrolysis reaction, and zinc oxide@zeolitic
imidazolate framework-8 nanorods (ZnO@ZIF-8 nanorods), synthesised using a hydrothermal method.
The nanomaterials were characterized using scanning electron microscopy, transmission electron
microscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy Raman spectroscopy, and
Fourier transform infrared spectroscopy. The ZnO@ZIF-8 nanorods were inactive as a sensor, the CNPs
showed some sensor activity, and the CNPs/ZnO@ZIF-8 nanorod composite performed as a viable solidstate
sensor. The mass ratio of ZnO@ZIF-8 nanorods within the CNPs/ZnO@ZIF-8 nanorod composite
was varied to investigate selectivity and sensitivity for the detection of ethanol, 2-propanol, acetone,
ethyl acetate, chloroform, and methanol vapours. The assembled sensor composed of the CNPs/
ZnO@ZIF-8 nanorod composite with a mass ratio of 1.5 : 6 showed improved gas sensing properties in
the detection of methanol vapour with a LOD of 60 ppb. The sensor is insensitive to humidity and the
methanol vapour sensitivity was found to be 0.51 U ppm 1 when detected at room temperature. |
en_US |
dc.description.department |
Chemistry |
en_US |
dc.description.librarian |
am2023 |
en_US |
dc.description.uri |
http://pubs.rsc.org/en/journals/journalissues/ra |
en_US |
dc.identifier.citation |
Malepe, L., Ndinteh, D.T., Ndungu, P. & Mamo, M.A. Selective detection of methanol vapour from a multicomponent gas mixture using a CNPs/ZnO@ZIF-8 based room temperature solid-state sensor. RSC Advances, 2022, 12, 27094-27107, doi : 10.1039/d2ra04665b. |
en_US |
dc.identifier.issn |
2046-2069 |
|
dc.identifier.other |
10.1039/d2ra04665b |
|
dc.identifier.uri |
https://repository.up.ac.za/handle/2263/89150 |
|
dc.language.iso |
en |
en_US |
dc.publisher |
Royal Society of Chemistry |
en_US |
dc.rights |
© 2022 The Author(s).
This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. |
en_US |
dc.subject |
Methanol vapour |
en_US |
dc.subject |
Human health |
en_US |
dc.subject |
Harmful |
en_US |
dc.subject |
Limit of detection (LOD) |
en_US |
dc.subject |
Carbon nanoparticles (CNPs) |
en_US |
dc.subject |
Zinc oxide@zeolitic imidazolate framework-8 nanorods (ZnO@ZIF-8 nanorods) |
en_US |
dc.title |
Selective detection of methanol vapour from a multicomponent gas mixture using a CNPs/ ZnO@ZIF-8 based room temperature solid-state sensor |
en_US |
dc.type |
Article |
en_US |