1Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan, Republic of China
2Department of Mechanical Engineering, Southern Taiwan University of Science and Technology, Tainan 710, Taiwan, Republic of China
3Department of Natural and Applied Sciences, Namibia University of Science and Technology, Private Bag 13388, Windhoek, Namibia
4Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan, Republic of China
5Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 701, Taiwan, Republic of China
Adv. Mater. Lett., 2017, 8 (11), pp 1046-1051
DOI: 10.5185/amlett.2017.1493
Publication Date (Web): Aug 05, 2017
Copyright © IAAM-VBRI Press
E-mail: dsahu@nust.na, jlh888@mail.ncku.edu.tw
Various pore sizes of a porous alumina membrane were fabricated using H2SO4 and H2C2O4 electrolyte under different ionization voltages. Cu nanowire arrays with high aspect ratios, uniform pore size, and ordered pore arrangement were synthesized using the above porous alumina membrane (PAM). Moreover, Cu2O nanowire arrays were prepared through the oxidization of Cu metal nanowire arrays. From the microstructure and compositional analysis, it was observed that pores of different sizes, i.e. 20~30, 70~90 and 90~100 nm could be obtained by controlling various electrolytes and anodization voltage. The Cu nanowire synthesized with various pore sizes were found to be single crystal (20~90 nm) and polycrystalline (90~100nm) respectively. The single crystal Cu with (111) direction was occurred due to homogeneous current density distribution and relationship between current density (J) and nucleus radius (ro). After oxidation of Cu, the Cu2O nanowires with the pore sizes of 20~100 nm was found to be single crystal. The rearranged of Cu and O2 lattice sites promotes the enhancement of crystalline property.
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