Nanocrystallized steel surface by micro-shot peening for catalyst-free carbon nanotube growth |
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Authors: | Young-Ki Ko Sehoon Yoo |
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Affiliation: | Micro-Joining Center, Korea Institute of Industrial Technology, 7-47 Songdo-dong, Yeonsu-Gu, Incheon 406-840, Republic of Korea |
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Abstract: | Nanocrystallized steel surface by micro-shot peening (MSP) were applied to carbon nanotube growth in this study. Micro-shot peening treatment severely deformed steel surface and nanocrystallized surface layer was formed by the plastic deformation. The grain sizes of the nanocrystallized layer were 10-30 nm after 300 s of MSP treatment. On the nanocrystallized surface, carbon nanotubes were formed with thermal chemical vapour deposition without catalysts. Before carbon nanotube growth, the nanocrystallized steel surface was reduced with H2/N2 gas at 600 °C. The carbon nanotube growth was performed at 600 °C with C2H2 gas carried by H2/N2 gas. The carbon nanotubes formed on the nano-structured surface was multi-walled carbon nanotube and the diameter was 10-20 nm. The reduction process before carbon nanotube growth was essential to form carbon nanotubes on the nanocrystallized surface with MSP. |
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Keywords: | A nanostructures B vapor deposition C electron microscopy |
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