Synthesis of Uniform Carbon Micro-coils with High Yield Growth Study
Date Issued
2010
Date
2010
Author(s)
Tsai, Jia-Lun
Abstract
In the study, we try to control the catalyst particles size to growth uniform carbon micro-coils, and bring out a method to produce mixed catalyst. We combine thin-film catalyst with powdered catalyst to synthesize uniform carbon micro-coils.
First, we evaporate a thin film of iron on SiO2, and then spin coating tin oxide (which mixing with alcohol) on substrate. After that, we synthesize carbon micro-coils by chemical vapor deposition, which are obtained by pyrolysis of acetylene at 700℃, under 1 atm. The growing results have been observed by SEM and TEM. Coils’ line diameter, coil diameter, pitch and yield are the main characteristic which we concern about, and then we analysis how catalyst size effects the size of carbon coils.
In summary, carbon micro-coils with controlled diameters have average coil diameter: 3.36 μm, line diameter: 385 nm, pitch: 1.82 μm and growing yield is about 90%. There are different morphologies of as-grown carbon nanocoils from this work and other literature. And we found that the tin oxide particle size has a relation with the line diameter, both the thickness of thin film of iron has a relation with the coil diameter. By using mixed catalyst, we can produce carbon micro-coils with high yield.
Subjects
Carbon coils
Catalyst
yield
Chemical vapor deposition
Diameter Control
Type
thesis
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