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Assoc. Prof 

Ndlangamandla, Ceboliyazakha

Faculty: Faculty of Science, Agriculture and Engineering
Department: Physics
Research Interest(s): Nanomaterials for gas sensing applications.
Biography: Prof Ndlangamandla is an Associate Professor and an active researcher at the Department of Physics at the University of Zululand. He was raised in a very humble, deep rural area of uPhongolo in the northern KwaZulu-Natal and obtained a PhD in Physics in the field of materials at the University of Zululand. He has accumulated vast knowledge in academic administration over the years. He participated in a number of local and international conferences and workshops and has published a number of articles in peer-reviewed journals. He’s been involved in quite a number of research projects in and out of the University such as the Development of high performances solar absorber coatings for energy efficient heating and cooling modular solar powered aquaponics systems with Nanoenergy for Sustainable Development in Africa NESDAF’s Research and Innovation Strategy Group, Hematite Nanorods array for water splitting applications and Nanofluids with Prof Maaza’s group at NRF-iThemba LABS and UNESCO-UNISA. He is a member and registered as a professional physicist with the South African Institute of Physics. He supervised and continues to supervise Hons, MSc and PhD students in the Department of Physics and Engineering. His research is in materials specifically nanomaterials, suitable for hybrid applications such as solar absorbers and gas sensing.
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    PublicationJournal Article
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    The effect of acids precipitants on the synthesis of WO3 hierarchical nanostructures for highly selective and sensitive H2S detection
    2023
     | Frontiers Media S.A.
    The detection and monitoring of H2S gas at high and lower concentrations is very crucial since this gas is highly toxic and can affect tissues and organs, especially in occupational environment. This work reports on the synthesis of WO3 nanostructures-based sensors for highly sensitive and selective H2S detection at low operating temperatures. These WO3 nanostructures were synthesized using pressurized hydrothermal process. Different acids from weak to strong (HNO3, H2SO4, and HCl) were employed as precipitants to form supposedly hierarchical and cube-like nanostructures of WO3. These WO3 nanostructures were characterized by XRD, SEM, TEM, XPS and BET analysis. The fabricated WO3 sensors were exposed to different target gases (CO2, H2, CH4, NH3, LPG and H2S) at different concentrations. They were found to be selective to H2S, and the WO3 precipitated by HCl otherwise referred to as WO3-HCl was found to be highly sensitive, with high response of S = 1394.04 towards 150 ppm of H2S at 125°C operating temperature. The WO3 precipitated by H2SO4 named WO3-H2SO4 showed a high response of 141.64 at 125°C operating temperature. Lastly, WO3 precipitated by HNO3 called WO3-HNO3, recorded a H2S response of 125.75 also at 125°C operating temperature. The HCl-precipitated WO3 is a promising candidate for selective detection of H2S, being the most sensitive in the series.
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