Analysis of Field Electron Emission Characteristics of Chemically Modified Carbon Nanotubes
碩士 === 國立臺灣科技大學 === 光電工程研究所 === 97 === Carbon nanotubes (CNTs) were synthesized on carbon cloth by thermal chemical vapor deposition (TCVD). To enhance the field emission current, catalyst metal at the tip of CNTs was removed by chemical modifications with nitric acid (HNO3). The field emission char...
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ndltd-TW-097NTUS51240032016-05-02T04:11:38Z http://ndltd.ncl.edu.tw/handle/06697097125512745040 Analysis of Field Electron Emission Characteristics of Chemically Modified Carbon Nanotubes 化學改質對於奈米碳管之場電子發射特性分析 Chia-Huan Chen 陳嘉桓 碩士 國立臺灣科技大學 光電工程研究所 97 Carbon nanotubes (CNTs) were synthesized on carbon cloth by thermal chemical vapor deposition (TCVD). To enhance the field emission current, catalyst metal at the tip of CNTs was removed by chemical modifications with nitric acid (HNO3). The field emission characteristics of CNTs with various HNO3 immersion time were investigated. As a result, when the HNO3 immersion time was 15 min, the threshold electric field (Eth) has the lowest value of 1.9 V/um. When the immersion time was extended, the Eth increased due to defects at the surface of CNTs. Although the Eth was decreased with the optimal condition of HNO3 treatment, the long-term stability of as treated CNTs was poor. To improve the stability, ZnO nanostructures were synthesized on the surface of the open-end CNTs. Consequently, the long-term stability of the CNTs was improved and an even lower Eth, i.e. 1.5 V/um, was obtained. Kuei-Yi Lee 李奎毅 2009 學位論文 ; thesis 47 en_US |
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碩士 === 國立臺灣科技大學 === 光電工程研究所 === 97 === Carbon nanotubes (CNTs) were synthesized on carbon cloth by thermal chemical vapor deposition (TCVD). To enhance the field emission current, catalyst metal at the tip of CNTs was removed by chemical modifications with nitric acid (HNO3). The field emission characteristics of CNTs with various HNO3 immersion time were investigated. As a result, when the HNO3 immersion time was 15 min, the threshold electric field (Eth) has the lowest value of 1.9 V/um. When the immersion time was extended, the Eth increased due to defects at the surface of CNTs. Although the Eth was decreased with the optimal condition of HNO3 treatment, the long-term stability of as treated CNTs was poor. To improve the stability, ZnO nanostructures were synthesized on the surface of the open-end CNTs. Consequently, the long-term stability of the CNTs was improved and an even lower Eth, i.e. 1.5 V/um, was obtained.
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author2 |
Kuei-Yi Lee |
author_facet |
Kuei-Yi Lee Chia-Huan Chen 陳嘉桓 |
author |
Chia-Huan Chen 陳嘉桓 |
spellingShingle |
Chia-Huan Chen 陳嘉桓 Analysis of Field Electron Emission Characteristics of Chemically Modified Carbon Nanotubes |
author_sort |
Chia-Huan Chen |
title |
Analysis of Field Electron Emission Characteristics of Chemically Modified Carbon Nanotubes |
title_short |
Analysis of Field Electron Emission Characteristics of Chemically Modified Carbon Nanotubes |
title_full |
Analysis of Field Electron Emission Characteristics of Chemically Modified Carbon Nanotubes |
title_fullStr |
Analysis of Field Electron Emission Characteristics of Chemically Modified Carbon Nanotubes |
title_full_unstemmed |
Analysis of Field Electron Emission Characteristics of Chemically Modified Carbon Nanotubes |
title_sort |
analysis of field electron emission characteristics of chemically modified carbon nanotubes |
publishDate |
2009 |
url |
http://ndltd.ncl.edu.tw/handle/06697097125512745040 |
work_keys_str_mv |
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