Growth of carbon nanotubes on graphene using chemical vapor deposition to form a three-dimension hybrid structure
| Autor: | Hung-Lin Fu, 傅宏霖 |
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| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 Recently, the development of supercapacitors is the most popular issue in the energy-storage field. Previously, researchers usually used high surface-area activated carbons as the electrodes for supercapacitors with high power density. However, there is still a challenge to get higher energy density for supercapacitors with traditional carbon materials. Thus, in this study, we try to develop a three-dimensional structure based on carbon nanotubes (CNTs) and grapheme as electrodes for supercapacitors instead of activated carbons. Here, we used graphene as the substrate and copper sulfate as a catalyst to grow CNTs on grapheme with various carbon sources, flowing rates, growth temperatures and times through the catalytic chemical vapor deposition. We systematically controlled the growth conditions of carbon nanotubes and investigated the as-grown CNTs on graphene with SEM, TEM, Raman, TGA and BET methods. The results show that the growth temperatures during 800-900 oC with higher flow rates of carbon sources can get better growth yields and morphologies of CNTs. The sheet resistance measurements reveal that the more growth yields on graphene can get lower sheet resistances. Our results can provide a new insight for developing supercapacitors with a hybrid carbon structure-CNT/graphene. Keywords: Carbon nanotubes, Graphene, Copper catalyst, Chemical vapor deposition, Supercapacitor |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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