Self-orientation of short single-walled carbon nanotubes deposited on graphite

Yanagi, Hisao; Sawada, Eriko; Manivannan, Ayyakkannu; Nagahara, Larry A.
March 2001
Applied Physics Letters;3/5/2001, Vol. 78 Issue 10, p1355
Academic Journal
In view of practical handling of single-walled carbon nanotubes (SWNTs), here we present cutting procedures and spontaneous ordering of SWNTs deposited on highly oriented pyrolytic graphite (HOPG). Purified SWNTs were cut by ultrasonication in H[sub 2]SO[sub 4]/HNO[sub 3] mixture and further in de-ionized water. Thus, prepared short SWNTs were resuspended in methanol and dropped on a freshly cleaved HOPG surface. Scanning tunneling microscopy under a vacuum revealed that the short tubes of 20-100 nm in length were aligned along the basal axis of the HOPG lattice. Tunneling spectroscopy obtained from the oriented tubes indicated a semiconducting behavior, which was characterized in relation to their helical structure. The observed orientation of SWNTs was attributed to their one-dimensional electronic nature along the tube axis with the HOPG lattice. © 2001 American Institute of Physics.


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