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Blue- and red-shifts of V2O5 phonons in NH3 environment by in situ Raman spectroscopy

Author: Akande, Amos A ; Machatine, AGJ ; Masina, Bathusile N ; Chimowa, G ; Matsoso, B ; Roro, Kittessa T ; Duvenhage, M-M ; Swart, H ; Bandyopadhyay, J ; Ray, Suprakas S ; Mwakikunga, Bonex W Date: Jan 2018 A layer of ~30 nm V2O5/100 nm-SiO2 on Si was employed in the in situ Raman spectroscopy in the presence of NH3 effluent from a thermal decomposition of ammonium acetate salt with the salt heated at 100 °C. When the layer is placed at 25 °C, ... Read more
Effect of varying ethanol and water compositions on the acetone sensing properties of WO3 for application in diabetes mellitus monitoring

Author: Saasa, Valentine ; Lemmer, Yolandy ; Malwela, Thomas ; Akande, Amos A ; Beukes, M ; Mwakikunga, Bonex W Date: Mar 2020 Tungsten oxide based gas sensors have attracted a lot of attention in breath acetone analysis due to their potential in clinical diagnosis of diabetes. The major problem with this material in sensor application has been remarkable response ... Read more
Fabrication of ultra-high sensitive and selective CH4 room temperature gas sensing of TiO2nanorods: Detailed study on the annealing temperature

Author: Tshabalala, Zamaswazi P ; Shingange, Katekani ; Dhonge, Baban, P ; Ntwaeaborwa, OM ; Mhlongo, Gugu H ; Motaung, David E Date: Jul 2016 Applications of ultra-highly sensitive and selective methane (CH(sub4)) room temperature gas sensors are important for various operations especially in underground mining environment. Therefore, this study is set out to investigate the effect ... Read more
Novel high-activity catalysts for partial oxidation of methane to formaldehyde

Author: Parmaliana, A ; Frusteri, F ; Mezzapica, A ; Scurrell, MS ; Giordano, N Date: 07 May 1993 Vanadium oxide-silica catalysts can effect the partial oxidation of methane to formaldehyde with extremely high activities and the space time yield (STY) can reach a value in excess of 800 g kg-1cat h-1; bare silica also shows appreciable STY ... Read more
Oxidation of 4-methoxy-1-naphthol on promoted platinum catalysts

Author: Maphoru, MV ; Heveling, J ; Kesavan Pillai, Sreejarani Date: Jul 2017 Oxidative coupling of naphthols is a useful method for the formation of new carbon-carbon bonds in organic synthesis. In the presence of hydrogen peroxide, platinum supported on activated carbon catalyses this reaction. The outcome is influenced ... Read more

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Browsing by Subject "Selectivity"

Browsing by Subject "Selectivity"

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