Controlling the site density of multiwall carbon nanotubes via growth conditions

Siegal, M.P.; Overmyer, D.L.; Kaatz, F.H.
June 2004
Applied Physics Letters;6/21/2004, Vol. 84 Issue 25, p5156
Academic Journal
We present two complementary methods for controlling the site density of multiwall carbon nanotubes (CNTs) directly as a function of growth conditions from 1011 to 107 CNTs/cm2. Several potential applications require significant spacing between individual CNTs. The first method shows that the site density varies with the heat of formation of the hydrocarbon gas used during CNT growth by thermal chemical vapor deposition. The second method demonstrates that the site density decreases with increasing residual stress of the metal catalyst/diffusion barrier layers. These methods are combined for wide-range control of CNT site density.


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