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TiO2 nanowires for humidity-stable gas sensors for toluene and xylene

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dc.contributor.author Tshabalala, Zamaswazi P
dc.contributor.author Mokoena, Teboho P
dc.contributor.author Jozela, M
dc.contributor.author Tshilongo, J
dc.contributor.author Hillie, Thembela K
dc.contributor.author Swart, HC
dc.contributor.author Motaung, DE
dc.date.accessioned 2021-02-15T07:59:39Z
dc.date.available 2021-02-15T07:59:39Z
dc.date.issued 2020-12
dc.identifier.citation Tshabalala, Z.P., Mokoena, T.P., Jozela, M., Tshilongo, J., Hillie, T.K., Swart, H. & Motaung, D. 2020. TiO2 nanowires for humidity-stable gas sensors for toluene and xylene. <i>ACS Applied Nano Materials, (4)1.</i> http://hdl.handle.net/10204/11762 en_ZA
dc.identifier.issn 2574-0970
dc.identifier.uri http://hdl.handle.net/10204/11762
dc.description.abstract The dual-functionality sensor derived from semiconductor metal oxides operating at low temperature for low power consumption and robust stability toward humidity is a striking platform for economic and indoor air-quality monitoring. Therefore, in this work, temperature-dependent selectivity and robust stability toward carbon monoxide (CO), toluene (C7H8), and p-xylene (C8H10) are displayed by various TiO2 nanostructures synthesized following a facile hydrothermal method. The X-ray diffraction patterns confirmed the tetragonal structure of anatase TiO2. Surface studies confirmed the different morphologies, such as nanoparticles (TiO2 nanoparticles (TNPs)), nanowires (TiO2 nanowires (TNWs)), and sea-urchin-like hierarchically (HHC) arranged TiO2 nanostructures. Relatively high surface area and interconnected pore distribution were witnessed for TNWs and HHC nanostructures as compared to TNPs. In situ photoluminescence and X-ray photoelectron spectroscopy analyses confirmed the defect states of the nanostructures, and the TNWs possessed the highest concentration of oxygen vacancies and Ti3+, which influenced the dual-selectivity functionality of TNW toward C7H8 and C8H10 at 25 and 125 °C, respectively. Additionally, at an optimum working temperature of 25 °C, a response of 2.46 toward 20 ppm CO was witnessed for the HHC-based sensor and was attributed to the available surface area and active sites presented by the hierarchically arranged nanostructures. Cross-sensitivity measurements were conducted in the presence of interfering gases, which showed negligible cross-responses. The long-term stability in the presence of relative humidity and the sensing mechanism underlying the fascinating dual functionality for C7H8 and C8H10 vapor detection were discussed in detail. These findings showed that the current sensors can be employed for detection of C7H8 and C8H10 in a vastly robust and selective way with insignificant interference from ambient humidity. en_US
dc.format Abstract en_US
dc.language.iso en en_US
dc.relation.uri https://doi.org/10.1021/acsanm.0c02963 en_US
dc.relation.uri https://pubs.acs.org/doi/full/10.1021/acsanm.0c02963 en_US
dc.source ACS Applied Nano Materials, (4)1 en_US
dc.subject Dual functionality en_US
dc.subject Titanium dioxide en_US
dc.subject TiO2 en_US
dc.subject Toluene en_US
dc.subject VOC gas sensing en_US
dc.subject Xylene en_US
dc.title TiO2 nanowires for humidity-stable gas sensors for toluene and xylene en_US
dc.type Article en_US
dc.description.pages 702-716 en_US
dc.description.note Copyright © 2020 American Chemical Society. 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: https://doi.org/10.1021/acsanm.0c02963 en_US
dc.description.cluster Chemicals en_US
dc.description.impactarea NS Materials for Sensing App en_US
dc.identifier.apacitation Tshabalala, Z. P., Mokoena, T. P., Jozela, M., Tshilongo, J., Hillie, T. K., Swart, H., & Motaung, D. (2020). TiO2 nanowires for humidity-stable gas sensors for toluene and xylene. <i>ACS Applied Nano Materials, (4)1</i>, http://hdl.handle.net/10204/11762 en_ZA
dc.identifier.chicagocitation Tshabalala, Zamaswazi P, Teboho P Mokoena, M Jozela, J Tshilongo, Thembela K Hillie, HC Swart, and DE Motaung "TiO2 nanowires for humidity-stable gas sensors for toluene and xylene." <i>ACS Applied Nano Materials, (4)1</i> (2020) http://hdl.handle.net/10204/11762 en_ZA
dc.identifier.vancouvercitation Tshabalala ZP, Mokoena TP, Jozela M, Tshilongo J, Hillie TK, Swart H, et al. TiO2 nanowires for humidity-stable gas sensors for toluene and xylene. ACS Applied Nano Materials, (4)1. 2020; http://hdl.handle.net/10204/11762. en_ZA
dc.identifier.ris TY - Article AU - Tshabalala, Zamaswazi P AU - Mokoena, Teboho P AU - Jozela, M AU - Tshilongo, J AU - Hillie, Thembela K AU - Swart, HC AU - Motaung, DE AB - The dual-functionality sensor derived from semiconductor metal oxides operating at low temperature for low power consumption and robust stability toward humidity is a striking platform for economic and indoor air-quality monitoring. Therefore, in this work, temperature-dependent selectivity and robust stability toward carbon monoxide (CO), toluene (C7H8), and p-xylene (C8H10) are displayed by various TiO2 nanostructures synthesized following a facile hydrothermal method. The X-ray diffraction patterns confirmed the tetragonal structure of anatase TiO2. Surface studies confirmed the different morphologies, such as nanoparticles (TiO2 nanoparticles (TNPs)), nanowires (TiO2 nanowires (TNWs)), and sea-urchin-like hierarchically (HHC) arranged TiO2 nanostructures. Relatively high surface area and interconnected pore distribution were witnessed for TNWs and HHC nanostructures as compared to TNPs. In situ photoluminescence and X-ray photoelectron spectroscopy analyses confirmed the defect states of the nanostructures, and the TNWs possessed the highest concentration of oxygen vacancies and Ti3+, which influenced the dual-selectivity functionality of TNW toward C7H8 and C8H10 at 25 and 125 °C, respectively. Additionally, at an optimum working temperature of 25 °C, a response of 2.46 toward 20 ppm CO was witnessed for the HHC-based sensor and was attributed to the available surface area and active sites presented by the hierarchically arranged nanostructures. Cross-sensitivity measurements were conducted in the presence of interfering gases, which showed negligible cross-responses. The long-term stability in the presence of relative humidity and the sensing mechanism underlying the fascinating dual functionality for C7H8 and C8H10 vapor detection were discussed in detail. These findings showed that the current sensors can be employed for detection of C7H8 and C8H10 in a vastly robust and selective way with insignificant interference from ambient humidity. DA - 2020-12 DB - ResearchSpace DP - CSIR J1 - ACS Applied Nano Materials, (4)1 KW - Dual functionality KW - Titanium dioxide KW - TiO2 KW - Toluene KW - VOC gas sensing KW - Xylene LK - https://researchspace.csir.co.za PY - 2020 SM - 2574-0970 T1 - TiO2 nanowires for humidity-stable gas sensors for toluene and xylene TI - TiO2 nanowires for humidity-stable gas sensors for toluene and xylene UR - http://hdl.handle.net/10204/11762 ER - en_ZA
dc.identifier.worklist 24159 en_US


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