Synthesis of silicon nanowires by carbothermal evaporation method using metal catalyst
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Date
2017-07
Authors
Muhamad Dzulnawarin Bin Kamal Bahrin
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Abstract
Silicon nanowires (SiNWs) have successfully been synthesised by carbothermal
evaporation method with the use of catalyst. SiNWs with the diameter range of with 45
nm to 65 nm and from 35 nm to 65 nm were grown by using gold nanoparticles
(AuNPs) and nickel (Ni) catalyst respectively. Carbothermal evaporation method was
utilised since the procedure is simple and inexpensive. The precursor used was the 1:1
mixture of silicon powder with activated carbon powder. The precursor was heated in an
inert furnace atmosphere. The furnace was ramped up at 20 oC/min to reach the
temperature of 1100 oC. The evaporated silicon powder was carried by flowing nitrogen
gas and was deposited on the surface of (111) silicon substrate. By controlling the
physical parameters such as heating rate, growth temperature and time, substrate
position and location the morphology and chemical composition of deposited products
were evaluated by various characterization techniques. SiNWs were grown at 1100 oC
after 1 hour and 5 hours with the use of Ni and AuNPs catalyst respectively. The silicon
substrate was placed 12 cm away from the precursor vertically. Based on the
experimental results, it can be said the SiNWs were synthesised using the vapour-liquid solid (VLS) growth mechanism.