Optical and Electrical Characterizations of Carbon Nano-Materials

碩士 === 大同大學 === 光電工程研究所 === 98 === This thesis is mainly focused on carbon nano-materials. Two structures of carbon are discussed which are carbon nano-partitions (CNPs) and multi-walled carbon nanotubes (MWCNTs). In the first part of this thesis, we fabricated carbon flakes vertically standing...

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Bibliographic Details
Main Authors: Yen-tang Chiao, 焦彥棠
Other Authors: Tsung-hui Tsai
Format: Others
Language:zh-TW
Published: 2010
Online Access:http://ndltd.ncl.edu.tw/handle/33898127305251225450
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Summary:碩士 === 大同大學 === 光電工程研究所 === 98 === This thesis is mainly focused on carbon nano-materials. Two structures of carbon are discussed which are carbon nano-partitions (CNPs) and multi-walled carbon nanotubes (MWCNTs). In the first part of this thesis, we fabricated carbon flakes vertically standing on the substrate by radio frequency sputter. Then we measured the reflection and transmission in 250 to 850 nm of the wavelength on such CNPs array. We found that the CNP has good anti-reflection property. The average reflectance is 0.2% from one of our best sample in visible range. The lowest reflectance is 0.13% at 328 nm. This unique nano-material can be acted as a black body which is similar to the optical property with highly absorption of light by the sparse CNT. The detail optical characterization of anti-reflection verse different angles from such nano-material is also discussed. On the second part of this thesis, we measured the electrical property of the MWCNT. Our experiment show the rapid thermal annealed (RTA) multi-walled CNT can be imported. The post treated CNT exhibited higher conductance. As for control sample, the high density defects limited the carrier mobility which leads to the higher resistance. As experimental sample, the defects are nearly removed, so the carrier can achieve higher mobility. From the measurement of electrical conductance in different temperatures, the annealed CNT exhibited semiconductor characteristic. Higher temperature gives more excited carriers which leads to better conduction. Our results suggested that well-structured MWCNT can acts as a semiconductor which the carrier transport via outer shell of CNT and gives the electrical conductance via the 1D nano-channel.