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The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature

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dc.contributor.author Mokoena, Teboho P
dc.contributor.author Tshabalala, Zamaswazi P
dc.contributor.author Hillie, Kenneth T
dc.contributor.author Swart, HC
dc.contributor.author Motaung, DE
dc.date.accessioned 2020-10-08T09:07:49Z
dc.date.available 2020-10-08T09:07:49Z
dc.date.issued 2020-09
dc.identifier.citation Mokoena, T.P,. Tshabalala, Z.P,. Hillie, K.T,. et al. 2020. The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature. Applied Surface Science, vol 525, pp. 1-19 en_US
dc.identifier.issn 0169-4332
dc.identifier.uri doi.org/10.1016/j.apsusc.2020.146002
dc.identifier.uri https://www.sciencedirect.com/science/article/pii/S0169433220307583
dc.identifier.uri http://hdl.handle.net/10204/11608
dc.description Copyright: 2020, Elsevier. Due to copyright restrictions, the attached PDF file contains the abstract of the full-text item. For access to the full-text item, please consult the publisher's website. en_US
dc.description.abstract The detection of hazardous and toxic gases in homes and corporate world, with highly sensitive and selective manner continues to be of great interest. Therefore, we report on the gas sensing characteristics of NiO nanostructures with crystallite sizes of approximately 10–17 nm prepared by a co-precipitation method using various reaction times ranging from 2 to 24 h. The physical variation of the colour from green to black after heat treatment was observed due to non-stoichiometric property of NiO revealing blue emission, which was assigned to oxygen and/or nickel vacancies. The diffuse reflectance spectra revealed a wide direct band gap in the range of 3.4–3.6 eV. The high BET surface area ranging from 46 to 84 m(sup2)/g was witnessed. The NiO-8 h sensor revealed an excellent response of 74 towards 60 ppm of H(sub2)S at 75 °C in dry air. The detection limit of 0.013 and 1.6 ppm was observed for NiO-8 h based sensor in dry air and RH-40%, respectively. These findings specify that the NiO-8 h sensor has pronounced potential for applications in high-performance H(sub2)S gas sensor operating at low temperature. The underlying mechanism for the improved NiO-8 h sensing performance is debated. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Workflow;23761
dc.subject Blue luminescence en_US
dc.subject H2S gas sensing en_US
dc.subject NiO nanostructures en_US
dc.title The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature en_US
dc.type Article en_US
dc.identifier.apacitation Mokoena, T. P., Tshabalala, Z. P., Hillie, K. T., Swart, H., & Motaung, D. (2020). The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature. http://hdl.handle.net/10204/11608 en_ZA
dc.identifier.chicagocitation Mokoena, Teboho P, Zamaswazi P Tshabalala, Kenneth T Hillie, HC Swart, and DE Motaung "The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature." (2020) http://hdl.handle.net/10204/11608 en_ZA
dc.identifier.vancouvercitation Mokoena TP, Tshabalala ZP, Hillie KT, Swart H, Motaung D. The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature. 2020; http://hdl.handle.net/10204/11608. en_ZA
dc.identifier.ris TY - Article AU - Mokoena, Teboho P AU - Tshabalala, Zamaswazi P AU - Hillie, Kenneth T AU - Swart, HC AU - Motaung, DE AB - The detection of hazardous and toxic gases in homes and corporate world, with highly sensitive and selective manner continues to be of great interest. Therefore, we report on the gas sensing characteristics of NiO nanostructures with crystallite sizes of approximately 10–17 nm prepared by a co-precipitation method using various reaction times ranging from 2 to 24 h. The physical variation of the colour from green to black after heat treatment was observed due to non-stoichiometric property of NiO revealing blue emission, which was assigned to oxygen and/or nickel vacancies. The diffuse reflectance spectra revealed a wide direct band gap in the range of 3.4–3.6 eV. The high BET surface area ranging from 46 to 84 m(sup2)/g was witnessed. The NiO-8 h sensor revealed an excellent response of 74 towards 60 ppm of H(sub2)S at 75 °C in dry air. The detection limit of 0.013 and 1.6 ppm was observed for NiO-8 h based sensor in dry air and RH-40%, respectively. These findings specify that the NiO-8 h sensor has pronounced potential for applications in high-performance H(sub2)S gas sensor operating at low temperature. The underlying mechanism for the improved NiO-8 h sensing performance is debated. DA - 2020-09 DB - ResearchSpace DP - CSIR KW - Blue luminescence KW - H2S gas sensing KW - NiO nanostructures LK - https://researchspace.csir.co.za PY - 2020 SM - 0169-4332 T1 - The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature TI - The blue luminescence of p-type NiO nanostructured material induced by defects: H2S gas sensing characteristics at a relatively low operating temperature UR - http://hdl.handle.net/10204/11608 ER - en_ZA


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