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Title: Converting carbon nanofibers to carbon nanoneedles: Catalyst splitting and reverse motion
Authors: Yun, J.
Wang, R.
Hong, M.H. 
Thong, J.T.L. 
Foo, Y.L.
Thompson, C.V.
Choi, W.K. 
Issue Date: Oct-2010
Citation: Yun, J., Wang, R., Hong, M.H., Thong, J.T.L., Foo, Y.L., Thompson, C.V., Choi, W.K. (2010-10). Converting carbon nanofibers to carbon nanoneedles: Catalyst splitting and reverse motion. Nanoscale 2 (10) : 2180-2185. ScholarBank@NUS Repository.
Abstract: Carbon nanoneedles (CNNs) were grown using a plasma-enhanced chemical vapor deposition process in which the source gas (C2H2) was turned off 10 min before the NH3 flow and plasma were turned off. It is demonstrated that tubular carbon nanofibers (CNFs) grow while the source gas is on. However, once the source gas is turned off, the Ni catalyst at the top of each CNF splits to form a small catalyst that remains at the top of the tube and a larger catalyst that travels down the interior of the tube. We postulate that the motion of the bottom (larger) catalyst is driven by etching of the graphitic walls and 'cups' inside the CNF. This process, combined with slowing growth of the CNFs and etching of the material above the bottom catalyst, converts the carbon nanofibers to the final nanoneedle shape. © The Royal Society of Chemistry 2010.
Source Title: Nanoscale
ISSN: 20403364
DOI: 10.1039/c0nr00265h
Appears in Collections:Staff Publications

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