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Materials Science and Nanotechnology | Volume 2
May 21-22, 2018 | New York, USA
International Conference on
Nanoscience & Technology
Q
uantum dots (QDs) are semiconductor nano-particles,
which have many unique properties and show
interesting phenomena, such as size dependent emission
wavelength, narrow emission peak and broad excitation
range. QDs have been studied for almost three decades
and are nano-crystals in which excitons are confined in all
three spatial dimensions. The confinement can be realized
by fabricating the semiconductor in very small size, typically
several hundred to thousands of atoms per particle. Due
to quantum confinement effects, QDs act like artificial
atoms, showing controllable discrete energy levels. QDs
were first fabricated in the 80’s by Louis E. Brus and the
unique properties of these special nano-structures attracted
interest from many fields. CdSe is a binary semiconducting
material of cadmium and selenium. CdSe is being developed
in research for use in opto-electronic devices, nanosensing,
and biomedical imaging. This presentation will be focused
on CdSe and other metal based chalcogenides such as AgSe,
CuSe and Ag. Various methods have been explored in making
metal chalcogenide nanoparticles and for example, CdSe
nanoparticles are prepared using a solution of cadmium
and selenide under controlled conditions. The incorporation
of nanoparticles prepared into the polymer PMMA using
electrospinning technique in order to make polymer fibre.
Variation of percentages of CdSe nanoparticles into the
polymer cause coiling of fibres and decreased luminescence
intensity. CdSe nanoparticles were also used as core in the
synthesis of CdSe/ZnO and CdSe/PbS nanomaterials using
thioglycerol, hexadecylamine and trioctylphosphine oxide.
The semiconducting, metal nanoparticles and polymer fibres
will be discussed for their synthesis and characterization;
their properties will be explored from their synthetic
conditions.
Speaker Biography
Makwena Justice Moloto has completed his PhD at the age of 30 years from the
University of Zululand and spends time at the University of Manchester to complete
his PhD hosted by school of chemistry. He is the researcher at one of the technically
orientated university in the department of chemistry. He has published more than
40 papers in reputed journals and has been serving as a reviewer for a number of
materials chemistry journals of repute.
e:
makwenam@vut.ac.zaMetal and semiconductor nanoparticles and their polymer fibres
Makwena Justice Moloto
Vaal University of Technology, South Africa