2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Flame synthesis of carbon nanotubes using a double-faced wall stagnation flow burner

S.K. Woo, Y.T. Hong and O.C. Kwon
Sungkyunkwan University, KR

Keywords:
combustion synthesis, CNTs, double-faced wall stagnation flow burner

Abstract:
The potential of using a double-faced wall stagnation flow burner in mass production of carbon nanotubes was evaluated experimentally and computationally. With nitrogen-diluted premixed ethylene-air flames established on the Ni-coated stainless steel or Ni-sintered, double-faced wall, the propensities of carbon nanotube formation such as yields and internal structure were experimentally determined using scanning electron microscopy and transmission electron microscopy images and Raman spectroscopy, while the flame structure was computationally predicted using a 3-dimensional CFD code with a reduced reaction mechanism. For fuel-equivalence ratios of 1.25-1.60, the uniformity and yields of synthesized carbon nanotubes were evaluated in terms of the flame stretch rates. Results show substantial increase of area on the wall surface where uniform carbon nanotubes are synthesized with using the double-faced wall stagnation flow burner due to enhanced uniformity of temperature distribution along the wall surface, compared to the corresponding single-faced burner, and support the potential of using a double-faced wall stagnation flow burner in mass production of carbon nanotubes. For various flame stretch rates, uniform carbon nanotubes were produced though the optimum stretch rate may exist for given wall dimensions.

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