Catalytic growth of semiconductor micro- and nano-crystals using transition metal catalysts |
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Authors: | Kee Suk Nahm Young Hwan Mo Md Shajahan Sang Hyun Lee |
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Affiliation: | (1) School of Chemical Engineering and Technology, Chonbuk National University, 561-756 Chonju, Republic of Korea |
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Abstract: | The catalytic reaction concept was introduced in the growth of semiconductor micro- and nano-crystals. It was found that gallium
nitride (GaN) micro- and nano-crystal structures, carbon nanaotubes, and silicon carbide (SiC) nanostructures could be efficiently
grown using transition metal catalysts. The use of Ni catalyst enhanced the growth rate and crystallinity of GaN micro-crystals.
At 1,100 ‡C, the growth rate of GaN micro-crystals grown in the presence of Ni catalyst was over nine times higher than that
in the absence of the catalyst. The crystal quality of the GaN microcrystals was almost comparable to that of bulk GaN. Good
quality GaN nanowires was also grown over Ni catalyst loaded on Si wafer. The nanowires had 6H hexagonal structure and their
diameter was in the range of 30–50 nm. Multiwall nanotubes (MWNTs) were grown over 20Fe : 20Ni : 60Al2O3 catalyst. However, single wall nanotubes (SWNTs) were grown over 15Co : 15Mo : 70MgO catalyst. This result showed that the
structure of CNTs could be controlled by the selection of catalysts. The average diameters of MWNTs and SWNTs were 20 and
10 nm, respectively. SiC nanorod crystals were prepared by the reaction of catalytically grown CNTs with tetrametysilane.
Structural and optical properties of the catalytically grown semiconductor micro- and nano-crystals were characterized using
various analytic techniques.
This paper is dedicated to Professor Wha Young Lee on the occasion of his retirement from Seoul National University. |
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Keywords: | Catalytic Growth Micro- and Nano-Crystals GaN MWNT SWNT SiC |
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