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Refined carbothermal reduction approach for large scale, uniform growth of vertically aligned ZnO nanowires
Author(s) -
Lee JiSeung,
Lee DongKyoon,
Kim Jaehyun,
Kim Junghan,
Yang Heesun
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200925318
Subject(s) - carbothermic reaction , nanowire , materials science , graphite , zinc , nanotechnology , nanoscopic scale , chemical engineering , optoelectronics , composite material , metallurgy , carbide , engineering
For a large scale, uniform growth of vertically well‐aligned zinc oxide (ZnO) nanowires (NWs), a carbothermal reduction process was refined. Depending on how ZnO and graphite powders are loaded, i.e., stacked versus mixed states, the NWs show strikingly different growth behaviors. A newly introduced ZnO/graphite stacked source was found to be superior to a conventional mixed source with respect to the degree of vertical alignment and uniformity presumably due to the controlled (steady, slow) generation of Zn species at the ZnO/graphite boundaries. Effects of growth temperature, Ar gas flow, and weight of source materials on growth behaviors of ZnO NWs are investigated, and their optical and structural properties are characterized.