Synthesis of Carbon Micro-Coils with High Yield Growth Study
Date Issued
2009
Date
2009
Author(s)
Huang, Bo-Rei
Abstract
In this study, we focus on growing high yield rate and straight rate carbon coils. We use 0.6 g Fe particles (< 10 um) and 0.3 g SnO2 particles (< 0.1 um) mixing in 10 mL alcohol (99.5 %) for catalyst. Spin coating it in order to make sure the catalyst distribute on the silicon oxide wafer uniformly. And the sample annealed by the oven at 150 ℃ in air for 12 hr. The growing result lives up to the high yield and straightness we expect.arbon coils have been synthesized by chemical vapor deposition, which are obtained by 2 metals-catalyzed pyrolysis of acetylene at 700 ℃, under 1 atm. The growing results have been observed by SEM and TEM. The coils’ line diameter、coil diameter、yield and straightness are the main characteristic which we concern about, and then we analysis how catalyst size effects the size of carbon coils. n summary, the average coil diameter is about 1.91 um, and the size is bigger than the size of another Fe-Sn growing carbon coils. And the line diameter is about 0.52 um, growing yield is about 88 % and straightness of the growing carbon coils is about 70 %. And the experiment result also discovers the size of the catalyst has a positive relation to the line diameter. And the size of the iron catalyst which is bigger than 4 um can’t grow the carbon tubes successfully, because of the activity of the iron catalyst is too weak to grow carbon tubes.
Subjects
Carbon coil
Catalyst
Annealing
Chemical Vapor Deposition
Yield
Straightness
Type
thesis
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