LAPSE:2023.23013
Published Article
LAPSE:2023.23013
Hierarchical Nanoflowers of Colloidal WS2 and Their Potential Gas Sensing Properties for Room Temperature Detection of Ammonia
March 27, 2023
Abstract
A one-step colloidal synthesis of hierarchical nanoflowers of WS2 is reported. The nanoflowers were used to fabricate a chemical sensor for the detection of ammonia vapors at room temperature. The gas sensing performance of the WS2 nanoflowers was measured using an in-house custom-made gas chamber. SEM analysis revealed that the nanoflowers were made up of petals and that the nanoflowers self-assembled to form hierarchical structures. Meanwhile, TEM showed the exposed edges of the petals that make up the nanoflower. A band gap of 1.98 eV confirmed a transition from indirect-to-direct band gap as well as a reduction in the number of layers of the WS2 nanoflowers. The formation of WS2 was confirmed by XPS and XRD with traces of the oxide phase, WO3. XPS analysis also confirmed the successful capping of the nanoflowers. The WS2 nanoflowers exhibited a good response and selectivity for ammonia.
A one-step colloidal synthesis of hierarchical nanoflowers of WS2 is reported. The nanoflowers were used to fabricate a chemical sensor for the detection of ammonia vapors at room temperature. The gas sensing performance of the WS2 nanoflowers was measured using an in-house custom-made gas chamber. SEM analysis revealed that the nanoflowers were made up of petals and that the nanoflowers self-assembled to form hierarchical structures. Meanwhile, TEM showed the exposed edges of the petals that make up the nanoflower. A band gap of 1.98 eV confirmed a transition from indirect-to-direct band gap as well as a reduction in the number of layers of the WS2 nanoflowers. The formation of WS2 was confirmed by XPS and XRD with traces of the oxide phase, WO3. XPS analysis also confirmed the successful capping of the nanoflowers. The WS2 nanoflowers exhibited a good response and selectivity for ammonia.
Record ID
Keywords
ammonia, colloidal synthesis, gas sensing properties, hierarchical, nanoflowers
Subject
Suggested Citation
Gqoba SS, Rodrigues R, Mphahlele SL, Ndala Z, Airo M, Fadojutimi PO, Hümmelgen IA, Linganiso EC, Moloto MJ, Moloto N. Hierarchical Nanoflowers of Colloidal WS2 and Their Potential Gas Sensing Properties for Room Temperature Detection of Ammonia. (2023). LAPSE:2023.23013
Author Affiliations
Gqoba SS: Molecular Sciences Institute, School of Chemistry, University of The Witwatersrand, Johannesburg 2050, South Africa
Rodrigues R: Departamento de Física, Universidade Federal do Paraná, Curitiba 81531-980, Brazil
Mphahlele SL: Molecular Sciences Institute, School of Chemistry, University of The Witwatersrand, Johannesburg 2050, South Africa
Ndala Z: Molecular Sciences Institute, School of Chemistry, University of The Witwatersrand, Johannesburg 2050, South Africa
Airo M: Molecular Sciences Institute, School of Chemistry, University of The Witwatersrand, Johannesburg 2050, South Africa
Fadojutimi PO: Molecular Sciences Institute, School of Chemistry, University of The Witwatersrand, Johannesburg 2050, South Africa [ORCID]
Hümmelgen IA: Departamento de Física, Universidade Federal do Paraná, Curitiba 81531-980, Brazil
Linganiso EC: Molecular Sciences Institute, School of Chemistry, University of The Witwatersrand, Johannesburg 2050, South Africa; Microscopy and Microanalysis Unit, University of The Witwatersrand, Johannesburg 2050, South Africa [ORCID]
Moloto MJ: Institute for Water Technology and Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida Campus, Johannesburg 1710, South Africa
Moloto N: Departamento de Física, Universidade Federal do Paraná, Curitiba 81531-980, Brazil [ORCID]
Rodrigues R: Departamento de Física, Universidade Federal do Paraná, Curitiba 81531-980, Brazil
Mphahlele SL: Molecular Sciences Institute, School of Chemistry, University of The Witwatersrand, Johannesburg 2050, South Africa
Ndala Z: Molecular Sciences Institute, School of Chemistry, University of The Witwatersrand, Johannesburg 2050, South Africa
Airo M: Molecular Sciences Institute, School of Chemistry, University of The Witwatersrand, Johannesburg 2050, South Africa
Fadojutimi PO: Molecular Sciences Institute, School of Chemistry, University of The Witwatersrand, Johannesburg 2050, South Africa [ORCID]
Hümmelgen IA: Departamento de Física, Universidade Federal do Paraná, Curitiba 81531-980, Brazil
Linganiso EC: Molecular Sciences Institute, School of Chemistry, University of The Witwatersrand, Johannesburg 2050, South Africa; Microscopy and Microanalysis Unit, University of The Witwatersrand, Johannesburg 2050, South Africa [ORCID]
Moloto MJ: Institute for Water Technology and Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida Campus, Johannesburg 1710, South Africa
Moloto N: Departamento de Física, Universidade Federal do Paraná, Curitiba 81531-980, Brazil [ORCID]
Journal Name
Processes
Volume
9
Issue
9
First Page
1491
Year
2021
Publication Date
2021-08-25
ISSN
2227-9717
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Original Submission
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PII: pr9091491, Publication Type: Journal Article
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LAPSE:2023.23013
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https://doi.org/10.3390/pr9091491
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Mar 27, 2023
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