Synthesis of highly crystalline multilayeres structures of BNNTs as a potential neutron sensing element / Pervaiz Ahmad
We developed a simple and cost-effective Argon supported thermal CVD technique for the synthesis of h-BN nanostructures. Our developed technique for the synthesis of boron nitride nanotubes (BNNTs) is about 18 % less expensive as compared to the known simplest CVD techniques and 25 – 35 % to any...
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Format: | Thesis |
Published: |
2016
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Online Access: | http://studentsrepo.um.edu.my/6725/4/pervaiz.pdf http://studentsrepo.um.edu.my/6725/ |
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Summary: | We developed a simple and cost-effective Argon supported thermal CVD technique
for the synthesis of h-BN nanostructures. Our developed technique for the synthesis of
boron nitride nanotubes (BNNTs) is about 18 % less expensive as compared to the known
simplest CVD techniques and 25 – 35 % to any other technique with respect to the cost
of experimental setups and other accessories. The optimization of experimental
parameters and slight modification of our Argon supported thermal CVD technique leads
to the synthesis of different types, size, morphologies and shapes of h-BN nanostructures
such as BNNTs, BNNWs, BNMTs and BNNS etc. Change in precursors and substrate
nature resulted in different morphologies and formats of BNNTs, whereas the change of
reaction atmosphere from Argon to Ammonia resulted in the synthesis of BNMTs. The
decrease in the growth duration (60 min 30 min) and arrangement of vapor – liquid –
solid (VLS) growth mechanism resulted in the synthesis of BNNWs, whereas an increase
in the growth duration (60 min 90 min) in the presence of ammonia as a reaction
atmosphere resulted in the formation of BNNS. FESEM, EDX, HR-TEM, XPS and
Raman are used as characterization tools to study the morphology, size, internal structure,
elemental compositions and phase of the final product, respectively. The synthesized
nanostructures of h-BN have importance not only in the field of biomedical or
microelectronic mechanical systems but also in the developments of solid state neutron
detectors with higher detection efficiency. |
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