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Browsing by Author "Hillie, KT"

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Cathodoluminescence properties of SiO2:Pr3+and ZnO.SiO2:Pr3+ phosphor nanopowders

Author: Mhlongo, Gugu H ; Ntwaeaborwa, OM ; Dhlamini, MS ; Swart, HC ; Hillie, KT Date: Oct 2010 The successful incorporation of ZnO nanoparticles in Pr3+-doped SiO2 using a sol–gel process is reported. SiO2:Pr3+ gels, with or without ZnO nanoparticles, were dried at room temperature and annealed at 600 °C. On the basis of the X-ray ... Read more
Concentration effect of Tm3+ on cathodoluminescence properties of SiO2: Tm3+ and SiO2:Ho3+, Tm3+ systems

Author: Dhlamini, MS ; Mhlongo, Gugu H ; Swart, HC ; Ntwaeaborwa, OW ; Hillie, KT Date: May 2012 Cathodoluminescence (CL) properties of SiO2 powders activated with thulium (Tm3+) and holmium (Ho3+) ions prepared by a sol–gel process were investigated. Different molar concentrations of Tm3+ co-doped with Ho3+ were studied. The 460 nm ... Read more
The decoration of vicinal copper polycrystalline surface by Antimony

Author: Ndlovu, GF ; Asante, JKO ; Roos, WD ; Hillie, KT Date: Jul 2011 An Ultra-high Vacuum Variable Temperature Scanning Tunnelling Microscope was used to study the growth mechanism of Antimony on vicinal Cu polycrystalline samples. The STM data after deposition of 0.3 ML Sb at 300°C showed localization of Sb ... Read more
Dependence of photoluminescence (PL) emission intensity on Eu3+ and ZnO concentrations in Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphors

Author: Mhlongo, Gugu H ; Dhlamini, MS ; Swart, HC ; Ntwaeaborwa, OM ; Hillie, KT Date: Aug 2011 Y2O3:Eu3+ and ZnO·Y2O3:Eu3+ nanophosphor powders with different concentrations of Eu3+ ions were synthesized by a sol–gel method and their luminescence properties were investigated. The red photoluminescence (PL) from Eu3+ ions with the main ... Read more
Effects of Ce3+ concentration, beam voltage and current on the cathodoluminescence intensity of SiO2: Pr3+–Ce3+ nanophosphor

Author: Mhlongo, Gugu H ; Ntwaeaborwa, OM ; Dhlamini, MS ; Swart, HC ; Hillie, KT Date: Feb 2011 SiO2:Pr3+–Ce3+ phosphor powders were successfully prepared using a sol–gel process. The concentration of Pr3+ was fixed at 0.2 mol% while that of Ce3+ was varied in the range of 0.2–2 mol%. High resolution transmission electron microscopy ... Read more
Energy transfer between doubly doped Er3+, Tm3+and Ho3+ rare earth ions in SiO2 nanoparticles

Author: Dhlamini, MS ; Mhlongo, Gugu H ; Swart, HC ; Hillie, KT Date: Apr 2011 Preparation of Er3+, Ho3+ and Tm3+ ions co-doped SiO2 nanoparticle phosphor powders by sol gelmethod is reported. The morphology and the particle size of the SiO2 hostmatrix were confirmed by field emission scanning electron microscopy (FESEM). ... Read more
Enhanced exciton emission from ZnO nano-phosphor induced by Yb3+ ions

Author: Kabongo, GL ; Mhlongo, Gugu H ; Mothudi, BM ; Hillie, KT ; Swart, HC ; Dhlamini, MS Date: 2014 In this work, the sol–gel method was used to prepare Ytterbium (Yb(sup3+)) doped ZnO nano-phosphors with different concentrations of Yb(sup3+) ions. Their structural, morphological, photoluminescence, electronic states and the chemical ... Read more
Epitaxial deposition of silver ultrafine nano-clusters on defect-free surfaces of HOPG-derived few-layer graphene in a UHV multi-chamber by in-situ STM, ex-situ XPS and ab initio calculations

Author: Ndlovu, GF ; Roos, WD ; Wang, ZM ; Asante, JKO ; Mashapa, MG ; Jafta, C ; Mwakikunga, Bonex W ; Hillie, KT Date: Mar 2012 The growth of three-dimensional ultra-fine spherical nano-particles of silver on few layers of graphene derived from highly oriented pyrolytic graphite in ultra-high vacuum were characterized using in situ scanning tunneling microscopy (STM) ... Read more
Evaluation of nano encapsulation techniques in different polymeric system for the delivery of anti-tuberculosis drugs (ATD)

Author: Swai, H ; Hillie, KT ; Cingo, N ; Kalombo, Lonji ; Legodi, M ; Semete, B Date: Feb 2006 In this study, isoniazid, one of the most potent anti-TB drugs, was successfully encapsulated in poly (D, L- lactide-co-glycolide) (PLG) and in alginate-chitosan polymeric systems using a double-emulsion method and a cation-induced gelation ... Read more
From phonon confinement to phonon splitting in flat single nanostructures: A case of VO2@V2O5 core–shell nano-ribbons

Author: Mwakikunga, Bonex W ; Maaza, M ; Hillie, KT ; Arendse, CJ ; Malwela, T ; Sideras-Haddadf, E Date: Jul 2012 Raman spectroscopy of the VOx nano-ribbons is discussed in the framework of the Richter (1981) equation for optical phononconfinement (a) as modified for thin films by Fauchet and Campbell (1986), (b) as presented by Kim and co-workers for ... Read more
Graphene synthesis, catalysis with transition metals and their interactions by laser photolysis

Author: Mwakikunga, Bonex W ; Hillie, KT Date: Sep 2011 This chapter introduces some facts about graphene, how it was discovered, how it has been realised by several approaches and how to get its identity. Its identity is seen either through cross-sectional TEM or through its unique signature in ... Read more
The influence of Pr3+ co-doping on the photoluminescence and cathodoluminescence properties of SiO2:Eu3+/Tb3+

Author: Mhlongo, Gugu H ; Dhlamini, MS ; Ntwaeaborwa, OM ; Swart, HC ; Hillie, KT Date: Jul 2011 Tb3+-Pr3+, and Eu3+-Pr3+ ion pairs co-doped in a SiO2 matrix were prepared by a sol-gel method. Co-doping of Eu3+ and Tb3+ ions with Pr3+ in SiO2 resulted in the quenching of Eu3+ and Tb3+ emissions with increasing Pr3+ concentrations. The ... Read more
Investigation of broken symmetry of Sb/Cu(111) surface alloys by VT-STM

Author: Ndlovu, GF ; Asante, JKO ; Roos, WD ; Hillie, KT Date: Jul 2011 This work present an in situ Variable Temperature Scanning Tunneling Microscopy (VT-STM) study of the Sb/Cu(111) system studied at various temperatures. The experimental data support a structural model in which Sb atoms displace up to 1/3 of ... Read more
Luminescence dependence of Pr3+ activated SiO2 nanophosphor on Pr3+ concentration, temperature, and ZnO incorporation

Author: Mhlongo, Gugu H ; Ntwaeaborwa, OM ; Swart, HC ; Kroon, RE ; Solarz, P ; Ryba-Romanowski, W ; Hillie, KT Date: Aug 2011 Green-emitting ZnO nanoparticles were successfully embedded in Pr3+-doped SiO2 by a sol–gel method resulting in a red-emitting ZnO·SiO2:Pr3+ nanocomposite phosphor. The particle morphology and luminescent properties of SiO2:Pr3+ phosphor ... Read more
Luminescent properties and quenching effects of Pr3+ co-doping in SiO2:Tb3+/Eu3+ nanophosphors

Author: Mhlongo, Gugu H ; Dhlamini, MS ; Ntwaeaborwa, OM ; Swart, HC ; Hillie, KT Date: Feb 2014 Luminescence properties of Pr(sup3+) single doped SiO2 and Pr(sup3+) co-doped SiO(sub2):Tb(sup3+)/Eu(sup3+) nanophosphors synthesized using sol–gel method were investigated. X-ray diffraction (XRD), and scanning electron microscope (SEM) were ... Read more
Microstructural and photoluminescence properties of sol–gel derived Tb3+ doped ZnO nanocrystals

Author: Kabongo, GL ; Mhlongo, Gugu H ; Malwela, T ; Mothudi, BM ; Hillie, KT ; Dhlamini, MS Date: Apr 2014 Un-doped and Tb(Sup3+) doped ZnO nanocrystals with different concentrations of Tb(Sup3+) were synthesized by a sol–gel method and their photoluminescence (PL) properties were investigated. The successful incorporation of Tb(sup3+) ions with ... Read more
Optical and structural properties of nanostructured ZnO thin films deposited onto FTO/glass substrate by a solution-based technique

Author: Berruet, M ; Pereyra, CJ ; Mhlongo, Gugu H ; Dhlamini, MS ; Hillie, KT ; Vázquez, M ; Marotti, RE Date: Oct 2013 Nanostructured zinc oxide thin films were spin coated on conductive glass substrates via a sol–gel based technique using zinc acetate dihydrate as precursor. The pH of the alkalis used as catalytic agents in the hydrolysis step is shown to ... Read more
Temperature-dependence on the structural, optical, and paramagnetic properties of ZnO nanostructures

Author: Mhlongo, Gugu H ; Motaung, DE ; Nkosi, SS ; Swart, HC ; Malgas, GF ; Hillie, KT ; Mwakikunga, Bonex W Date: Feb 2014 Violet-blue emitting ZnO nanostructures were synthesized by a microwave-assisted hydrothermal method followed by post-synthesis annealing at different temperatures. Scanning electron microscope analysis revealed a morphological transformation ... Read more
XRD, DRS, and SEM stundies of the effects of metal dopants (Pt and Au) on the structural and optical properties of TiO2

Author: Moloantoa, JR ; Rammutla, KE ; Mosuang, TE ; Erasmus, RM ; Hillie, KT Date: Jul 2011 Au and Pt doped TiO2 nanocrystlas were prepared using the sol gel method. Diffuse Reflectance Spectroscopy (DRS) was used to study the characteristics of these precious metals and X-ray diffraction (XRD) with calculated lattice parameters was ... Read more

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