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노대호,김재수,변동진,양재웅,김나리,Rho, Dae-Ho,Kim, Jae-Soo,Byun, Dong-Jin,Yang, Jae-Woong,Kim, Na-Ri 한국재료학회 2003 한국재료학회지 Vol.13 No.10
SiC nanowires were synthesized by carbothermal reduction using metal catalysts. Synthesized nanowires had mean diameters of 30∼50 nm and several $\mu\textrm{m}$ length. The kind of catalysts affects form of SiC nanowire because of difference of growth mechanisms. These differences were made by catalyst's physical property and relative activities to the source gas. Ni acted a conventional catalyst of VLS growth mechanism. But, Case of Fe, SiC nanowire was grown by stable VLS growth mechanism without relation of growth conditions. SiC nanowire was grown by two step growth model using Cr catalyst. Conversion ratios to the SiC nanowire were increased with growth conditions. Case of Cr, conversion ratio was about 45% that was higher than other catalyst used. This high conversion ratio was obtained by the addition VS growth to radial direction on the as-grown nanowires.
CNT-confined reaction에 의한 탄화규소 나노튜브의 합성
노대호,김재수,변동진,양재웅,김나리,Rho Dae-Ho,Kim Jae-Soo,Byun Dong-Jin,Yang Jae-Woong,Kim Na-Ri 한국재료학회 2004 한국재료학회지 Vol.14 No.3
SiC nanotubes were synthesized by CNT-confined reaction. Evaporated SiO gas reacted with carbon nanotubes by VS growth mechanism. By confineded reaction, carbon nanotube was changed to SiC nanotube, and synthesized SiC nanotube was filled partly by the gas reaction in the nanotubes. SiC nanotube's mean diameters were not changed than carbon nanotubes because of means ratio of $CO_2$ and SiO gas was maintained evenly during the process. This result was same of data of simulation. By TEM observastion, SiC nanotube was filled by reaction of inner wall of CNT and SiO gas through the VS reactions. Converted SiC nanotube's compositions were revealed Si and C of 1: 1 ratios at all sites of nanotube by EDS.
노대호,김재수,변동진,이재훈,양재웅,김나리,Rho, Dae-Ho,Kim, Jae-Soo,Byun, Dong-Jin,Lee, Jae-Hoon,Yang, Jae-Woong,Kim, Na-Ri 한국재료학회 2005 한국재료학회지 Vol.15 No.3
[ $SiO_2$ ] nanowires were synthesized using the catalyst evaporation method. Grown nanowires had different shapes by kind of used metal catalyst. Mean diameters of grown $SiO_2$ nanowire were about 30 nm. The kind of catalysts affected microstructure of grown $SiO_2$ nanowire because of its typical growth reactions through the liquid state metal catalysts. Optical property were measured by photoluminescence spectroscopy. Relatively broad peak was obtained and mean peak positioned at 450 nm.
기상휘발법에 의한 이산화규소 나노와이어의 성장에 미치는 가스의 영향
노대호,김재수,변동진,이재훈,양재웅,김나리,Rho Dae-Ho,Kim Jae-Soo,Byun Dong-Jin,Lee Jae-Hoon,Yang Jae-Woong,Kim Na-Ri 한국재료학회 2005 한국재료학회지 Vol.15 No.5
Effects of gases to growth of $SiO_2$ nanowires were characterized. $N_2$, Ar, and $O_2$ gas's effect were determined. $SiO_2$ nanowires growth scheme was varied by kind and flow rates of gases because of amounts of $O_2$. Flow rates of gases and kind of substrates affected nanowires' diameters, lengths and morphologies of grown nano wires. With increasing flow rates of gases, nanowire's diameter increased because of additional VS and SLS reactions. By TEM characterization, We knows that, grown $SiO_2$ nanowires on Si substrate showed two shell structures. These shapes of nanowires were formed by reaction of additional SLS growth. Grown $SiO_2$ nanowires showed blue luminescence by PL characterization These Blue luminescence was due to quantum confinement effect and oxygen vacancies in the nanowires.
노대호,김재수,변동진,이재훈,양재웅,김나리,조성일,Rho Dae-Ho,Kim Jae-Soo,Byun Dong-Jin,Lee Jae-Hoon,Yang Jae-Woong,Kim Na-Ri,Cho Sung-Il 한국재료학회 2004 한국재료학회지 Vol.14 No.7
$SiO_2$ nanowires were synthesized using the vapor evaporation method. Grown nanowires had a different shapes by kind of substrates. Diameters and lengths of the nanowires increased with increasing growth temperature and time. Mean diameters and lengths of $SiO_2$ nanowire were different by kind of substrates. These variations were attributed to nanowire densities on the substrates. The kind of substrates affected microstructure and PL properties of grown nanowires. In case of $Al_{2}O_3$ and quartz substrates, additional $O_2$ were supported during growth stages, and made a nucleation site. Therefore relative narrow nanowire was grown on $Al_{2}O_3$ and quartz substrates. Optical property were measured by photoluminescence spectroscopy. Relatively broad peak was obtained and mean peak positioned at 450 and 420nm. however in case of quartz substrates, mean peak positioned at 370nm. These peak shift was contributed to the size and substrate effects.
SLS(Solid-Liquid-Solid) 성장기구에 의한 탄화규소 나노튜브의 성장
노대호,김재수,변동진,양재웅,김나리,Rho Dae-Ho,Kim Jae-Soo,Byun Dong-Jin,Yang Jae-Woong,Kim Na-Ri 한국재료학회 2004 한국재료학회지 Vol.14 No.2
SiC nanotubes were synthesized by SLS growth mechanism using various metal catalysts. Synthesized nanotubes had mean diameters of 20~50 nm and several $\mu\textrm{m}$ length. The kind of catalysts affected microstructures of SiC nanotubes by different diffusion routes. These differences are attributed to catalysts' physical properties and relative activities to the graphite substrate. Fe acted as a good catalyst of SLS growth mechanism. But in case of Ni, SiC nanotubes grew slowly. Optical property was measured by photoluminescence measurement. Relatively broad peak was obtained and mean peak positioned at about 430 nm. This result was the same as other nanocrystalline SiC materials, but was different from the results of bulk SiC probably due to quantum confinement effect and defect in the grown SiC nanotube.
노대호,김재수,변동진,양재웅,김나리,Rho, Dae-Ho,Kim, Jae-Soo,Byun, Dong-Jin,Yang, Jae-Woong,Kim, Na-Ri 한국재료학회 2003 한국재료학회지 Vol.13 No.6
SiC nanorods have been grown on Si (100) substrate directly. Tetramethylsilane and Ni were used for SiC nanorod growth. After 3minute, SiC nanorod had grown by CVD. Growth regions ware divided by two regions with diameter. The First region consisted of thin SiC nanorods having below 10 nm diameter, but second region's diameter was 10∼50 nm. This appearance shows by reduction of growth rate. The effect of temperature and growth time was investigated by scanning electron microscopy. Growth temperature and time affected nanorod's diameter and morphology. With increasing growth time, nanorod's diameter increased because of the deactivation effect. But growth temperatures affected little. By TEM characterization, grown SiC nanorods consisted of the polycrystalline grain.
김나리,김재수,변동진,노대호,양재웅,Kim, Na-Ri,Kim, Jae-Soo,Byun, Dong-Jin,Rho, Dae-Ho,Yang, Jae-Woong 한국재료학회 2003 한국재료학회지 Vol.13 No.10
The ZnO nanorods were synthesized using vapor-solid (VS) method on sodalime glass substrate without the presence of metal catalyst. ZnO nanorods were prepared thermal evaporation of Zn powder at $500^{\circ}C$. As-fabricated ZnO nanorods had an average diameter and length of 85 nm and 1.7 $\mu\textrm{m}$. Transmission electron microscopy revealed that the ZnO nanorods were single crystalline with the growth direction perpendicular to the (101) lattice plane. The influences of reaction time on the formation of the ZnO nanorods were investigated. The photoluminescence measurements showed that the ZnO nanorods had a strong ultraviolet emission at around 380 nm and a green emission at around 500 nm.