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WENSUN,Mi Jung,Oh-Shim Joo,모선일 한국물리학회 2006 Current Applied Physics Vol.6 No.6
Well-ordered nanoporous alumina templates were fabricated by two-step anodization method by applying a constant voltage of40 V in oxalic acid solution or of 25 V in sulfuric acid solution. The cylindrical pore diameter and pore density of the templatesutilized for the carbon nanotube (CNT) growth were 86 ± 5 nm and 1.2· 1010 cm. 2 in oxalic acid solution and 53 ± 1 nm and3.1· 1010 cm. 2 in sulfuric acid solution, respectively. The CNTs with uniform diameter of 50 ± 10 nm (oxalic acid) and44 ± 2 nm (sulfuric acid) were grown on the porous alumina template as electrode materials for the electrochemical double layercapacitor (EDLC). The EDLC characteristics were examined by measuring the capacitances from cyclic voltammograms and thechargedischarge curves. The specic capacitances of the CNT electrodes are 30 ± 1 F/g (U = 50 ± 10 nm) and 121 ± 5 F/g(U = 4 ± 2 nm). The high specic capacitance of the CNT electrode was achieved by using nanoporous alumina templates withthe high pore density and the small and uniform pore diameter.
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CdTe/GaAs Nanodot Arrays and Carbon Nanotubes Prepared Utilizing Nanoporous Alumina Templates
Sun-il Mho,WENSUN,정미,In-Hyeong Yeo 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Nanoporous alumina templates were prepared by anodizing grain-free aluminum at constant voltage. The self-assembled hexagonally close-packed alumina cell result in ordered cylindrical nanohole arrays with interpore spacings ranging from 50 to 150 nm and pore sizes from 25 to 120 nm. Long-range-ordered CdTe nanodot arrays with controlled size and density were grown on GaAs substrates by using molecular-beam epitaxy with ultrathin nanoporous alumina masks; uniform dot sizes in the ranges of 35 nm (with a density of 2.5 10¹0 cm-²) and 80 nm (with a density of ~8.1 x 10 9 cm-²) were prepared as replicas of the alumina masks. The specic capacitances of the carbon nanotube (CNT) electrodes for electrochemical double-layer capacitors were significantly enhanced, a maximum value of 175 F g-¹, by using the nanoporous alumina/aluminum templates with high pore density and uniform pore diameter.
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