dc.contributor.author |
Mokoena, Teboho P
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|
dc.contributor.author |
Swart, HC
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|
dc.contributor.author |
Hillie, Kenneth T
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|
dc.contributor.author |
Motaung, DE
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dc.date.accessioned |
2021-04-10T11:10:56Z |
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dc.date.available |
2021-04-10T11:10:56Z |
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dc.date.issued |
2021-03 |
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dc.identifier.citation |
Mokoena, T.P., Swart, H., Hillie, K.T. & Motaung, D. 2021. Colour tuning from violet to blue emission stimulated by various nickel oxide nanostructures: Influence of bias voltage towards volatile organic compounds vapours. <i>Applied Surface Science, 542.</i> http://hdl.handle.net/10204/11968 |
en_ZA |
dc.identifier.issn |
0169-4332 |
|
dc.identifier.issn |
1873-5584 |
|
dc.identifier.uri |
https://doi.org/10.1016/j.apsusc.2020.148634
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|
dc.identifier.uri |
https://www.sciencedirect.com/science/article/pii/S0169433220333924
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|
dc.identifier.uri |
http://hdl.handle.net/10204/11968
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|
dc.description.abstract |
Propanol and benzene, toluene, ethylenebenzene and xylene (BTEX) vapours are within the volatile organic compounds (VOCs) family and are utilized in industrial and petroleum goods, are greatly toxic in human health and environment. Therefore, it is desired to fabricate the gas sensor that is sensitive and selective towards VOCs at relatively low temperature. Thus, herein, p-type NiO with various morphologies were synthesized using hydrothermal method, using different base precursors. Surface morphology analyses displayed NiO with platelets, nanoblocks, microspheres and nanorods structures, while Brunauer-Emmett-Teller surface area analyses showed surface areas of 79.19, 117.21, 70.47, and 20.98 m2/g, respectively. The colour changing from violet to blue emission with the transformation in morphology was observed from the Commission Internationale de I’Eclairage diagram. The deficiency in a material, such as nickel interstitials and nickel and/or oxygen vacancies were confirmed from photoluminescence and X-ray photoelectron spectroscopy. The performance of various NiO based sensors was evaluated in the presence of different vapours, at various bias voltages (0.25–2 V) and operating temperatures (25–150 °C). The NiO microsphere based sensor showed the best sensing characteristics towards propanol at an optimized applied bias voltage of 1 V and operating temperature of 150 °C. The NiO sensor derived from porous microspheres showed relatively maximum response values of 40 and 64% towards 60 ppm toluene and propanol vapours and rapid response/recovery times of 20 s/54 s (toluene) and 29 s/86 s (propanol) at the functional temperature of 150 °C. These findings showed that NiO sensors can be regarded as promising candidates for the identification of toluene and propanol vapours at relatively low operating temperatures with fast response/recovery times. |
en_US |
dc.format |
Abstract |
en_US |
dc.language.iso |
en |
en_US |
dc.source |
Applied Surface Science, 542 |
en_US |
dc.subject |
Gas sensing |
en_US |
dc.subject |
Luminescence |
en_US |
dc.subject |
Nanostructures |
en_US |
dc.subject |
NiO |
en_US |
dc.title |
Colour tuning from violet to blue emission stimulated by various nickel oxide nanostructures: Influence of bias voltage towards volatile organic compounds vapours |
en_US |
dc.type |
Article |
en_US |
dc.description.pages |
15pp |
en_US |
dc.description.note |
© 2020 Elsevier B.V. All rights reserved. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website: https://www.sciencedirect.com/science/article/pii/S0169433220333924 |
en_US |
dc.description.cluster |
Chemicals |
en_US |
dc.description.impactarea |
NS Materials for Sensing App |
en_US |
dc.identifier.apacitation |
Mokoena, T. P., Swart, H., Hillie, K. T., & Motaung, D. (2021). Colour tuning from violet to blue emission stimulated by various nickel oxide nanostructures: Influence of bias voltage towards volatile organic compounds vapours. <i>Applied Surface Science, 542</i>, http://hdl.handle.net/10204/11968 |
en_ZA |
dc.identifier.chicagocitation |
Mokoena, Teboho P, HC Swart, Kenneth T Hillie, and DE Motaung "Colour tuning from violet to blue emission stimulated by various nickel oxide nanostructures: Influence of bias voltage towards volatile organic compounds vapours." <i>Applied Surface Science, 542</i> (2021) http://hdl.handle.net/10204/11968 |
en_ZA |
dc.identifier.vancouvercitation |
Mokoena TP, Swart H, Hillie KT, Motaung D. Colour tuning from violet to blue emission stimulated by various nickel oxide nanostructures: Influence of bias voltage towards volatile organic compounds vapours. Applied Surface Science, 542. 2021; http://hdl.handle.net/10204/11968. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Mokoena, Teboho P
AU - Swart, HC
AU - Hillie, Kenneth T
AU - Motaung, DE
AB - Propanol and benzene, toluene, ethylenebenzene and xylene (BTEX) vapours are within the volatile organic compounds (VOCs) family and are utilized in industrial and petroleum goods, are greatly toxic in human health and environment. Therefore, it is desired to fabricate the gas sensor that is sensitive and selective towards VOCs at relatively low temperature. Thus, herein, p-type NiO with various morphologies were synthesized using hydrothermal method, using different base precursors. Surface morphology analyses displayed NiO with platelets, nanoblocks, microspheres and nanorods structures, while Brunauer-Emmett-Teller surface area analyses showed surface areas of 79.19, 117.21, 70.47, and 20.98 m2/g, respectively. The colour changing from violet to blue emission with the transformation in morphology was observed from the Commission Internationale de I’Eclairage diagram. The deficiency in a material, such as nickel interstitials and nickel and/or oxygen vacancies were confirmed from photoluminescence and X-ray photoelectron spectroscopy. The performance of various NiO based sensors was evaluated in the presence of different vapours, at various bias voltages (0.25–2 V) and operating temperatures (25–150 °C). The NiO microsphere based sensor showed the best sensing characteristics towards propanol at an optimized applied bias voltage of 1 V and operating temperature of 150 °C. The NiO sensor derived from porous microspheres showed relatively maximum response values of 40 and 64% towards 60 ppm toluene and propanol vapours and rapid response/recovery times of 20 s/54 s (toluene) and 29 s/86 s (propanol) at the functional temperature of 150 °C. These findings showed that NiO sensors can be regarded as promising candidates for the identification of toluene and propanol vapours at relatively low operating temperatures with fast response/recovery times.
DA - 2021-03
DB - ResearchSpace
DP - CSIR
J1 - Applied Surface Science, 542
KW - Gas sensing
KW - Luminescence
KW - Nanostructures
KW - NiO
LK - https://researchspace.csir.co.za
PY - 2021
SM - 0169-4332
SM - 1873-5584
T1 - Colour tuning from violet to blue emission stimulated by various nickel oxide nanostructures: Influence of bias voltage towards volatile organic compounds vapours
TI - Colour tuning from violet to blue emission stimulated by various nickel oxide nanostructures: Influence of bias voltage towards volatile organic compounds vapours
UR - http://hdl.handle.net/10204/11968
ER - |
en_ZA |
dc.identifier.worklist |
24276 |
en_US |