Preparation of Single-wall Carbon Nanotubes by the Addition of Yittrium and Iron
碩士 === 逢甲大學 === 材料科學學系 === 89 === Adding Y or Fe in anode for catalytic can synthesize single-wall carbon nanotubes. Adding Fe can synthesize single-wall carbon nanotubes, and as the weight percentages of Fe increase, the diameters of multi-wall carbon nanotubes decrease uniformly. If the...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2001
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| Online Access: | http://ndltd.ncl.edu.tw/handle/14453409585246148527 |
| Summary: | 碩士 === 逢甲大學 === 材料科學學系 === 89 === Adding Y or Fe in anode for catalytic can synthesize single-wall carbon nanotubes. Adding Fe can synthesize single-wall carbon nanotubes, and as the weight percentages of Fe increase, the diameters of multi-wall carbon nanotubes decrease uniformly. If the weight percentages of Fe is over 10 wt﹪, neither single-wall carbon nanotubes nor multi-wall carbon nanotubes were synthesized. And iron carbide with metal sheen were synthesized instead of single-wall carbon nanotubes and multi-wall carbon nanotubes. Although adding a trace of Y can synthesize single-wall carbon nanotubes, it can not decrease the diameters of multi-wall carbon nanotubes. The effect of adding a trace of Y is weaker than the effect of adding a trace of Fe. We can gain higher yield synthesis of single-wall carbon nanotubs and the diameters of multi-wall carbon nanotubes are decreasing a lot as the weight percentage of Y increasing. We found carbon nanotube bundles when the weight percentages of Y is high (9 wt﹪）. We conjecture the reason that of the formation of carbon nanotube bundles is a large number of Y atoms nucleating and growing in the same area.
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