Journal of Nanomaterials & Molecular NanotechnologyISSN: 2324-8777

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Francis B. Dejene Author

KiprotichS@ufs.ac.za

Subjects of specialization
Material Characterization, X-ray Diffraction, Nanoparticles, Composites, Materials Science

Affiliation
Department of Physics, University of the Free State, (QwaQwa campus), Private Bag X-13, Phuthaditjhaba, 9866, South Africa

Biography

Birhanu served as a lecturer at both Jomo Kenyatta University of Agriculture and Technology and Kenyatta University between 1994 and 1999. He is currently a professor at the department of physics, UFS (Qwa-Qwa Campus). He graduated for his PhD at RAU(currently UJ), where he addressed the incorporation of gallium and sulphur into CuInSe2 thin film, which was systematically investigated with a view to establish a scientific and engineering base for the fabrication of homogenous CuIn(Se,S)2 and Cu(In,Ga)Se2 quaternary alloys with optimum band gap values between 1.1 and 1.2 eV for the utilization in thin film solar cell devices. 

Publications

Research Article Subscription

Effect of Tellurium Concentration of the Solution on the Structural, Optical and Luminescence Properties of Cadmium Telluride Nanoparticles

Author(s):

Sharon Kiprotich, Martin O. Onani, Muzi O. Ndwandwe and Francis B. Dejene

Water-soluble cadmium telluride (CdTe) nanoparticles (NPs) were prepared using L-cystine as a capping agent. The reaction was carried out under basic conditions (at pH=11) and refluxed at 100ºC for 1 h. In this work, different tellurium (Te) concentrations in the solution of L-cystine functionalized CdTe NPs were prepared at low temperature of 100ºC and discussion of its effect was done in detail. The CdTe NPs were analyzed using X-ray diffraction (XRD), ultraviolet-vis and photoluminescence (PL) spectroscopy. Structural parameters estimated by XRD revealed cubic phase of CdTe at lower Te concentrations and hexagonal phase of Te emerging at higher Te concentration. XRD results showed that the NPs consisted of small CdTe nanocrystallites, 3.1-4.5 nm... view more»

DOI: 10.4172/2324-8777.1000245

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