Carbon nanotubes preparation using carbon monoxide from the pyrolysis flame

关键词：

carbon nanotube V-type pyrolysis flame temperatu

类别：

橡胶 >> 橡胶原料

来源：

2009高分子先进制造业论坛（青岛）

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485K

简介：

Carbon nanotube is a new kind of carbon material. Synthesis of carbon
nanotubes from V-type pyrolysis flame is a kind of novel technique. It needs simple
laboratory equipments and normal atmosphere pressure. The V-type pyrolysis flame
experimental system is introduced. Carbon source is the carbon monoxide which is
carried to the middle pipe of V-type pyrolysis flame combustor. Heat source is from
acetylene /air premixed flame. Pentacarbonyl iron, served as catalyst, is transported
by spray- pyrolysis method into the burner. The carbon nanotubes were characterized
by scanning electron microscope and transmission electron microscope. The diameter
of carbon nanotubes is approximate 20nm and its length is dozens of microns. The
impact of the temperature, reactant composition and catalyst was analyzed to reveal
the rule of carbon nanotube growth. Carbon nanotubes with good form and less
impurity can be captured when the temperature was from 800℃ to 1000℃ and carbon
monoxide/hydrogen/helium mixed gas flow was supplied. The effective diameter of
pentacarbonyl iron nanoparticles is approximate from 5nm to 20nm in the process of
carbon nanotube formation. Mechanism of carbon nanotube base on the V-type
pyrolysis flame method was proposed. The carbon “dissolved-proliferation-separate
out” theory can be used to explain how the pentacarbonyl iron catalyses carbon
monoxide to form carbon nanotubes.

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chem2000

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2009-11-04 16:21:55

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