Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials
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Wright State University / OhioLINK
2010
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=wright1290546481 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-wright12905464812021-08-03T06:17:13Z Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials Bulmer, John Simmons Physics carbon nanotube CNT carbon yarn fiber bulk conduction mechanism conductivity frequency temperature dependence versus graphitic intercalation compounds annealing forest growth floating catalyst super acid LCR network analyzer The resistance of three types of bulk carbon nanotube (CNT) materials (floating catalyst CNT yarn, forest grown CNT yarn, and super acid spun CNT fiber) was measured from room temperature to 900 C. Fitting the curves to established conduction equations for disordered materials, competing conduction mechanisms pertaining to the material could be determined. Floating catalyst CNT yarn displayed both semiconductive and metallic isotropic behavior with a resistance minimum, similar to the behavior of crystalline graphite. It was found that, at room temperature, the semiconducting contribution-most likely junctions between CNTs-accounted for 99.99% of the overall resistance. The resistance of forest grown CNT yarn and super acid solution spun CNT fiber decreased monotonically with temperature at a rate similar to amorphous carbon. The impedance of all three materials was also measured to 30 MHz. All three materials followed a series resistor inductor circuit, without any resistance decrease as others have found. Finally, the conductivity and specific conductivity of all three materials was compared to metallic benchmarks. While all three materials had a similar conductivity, the floating catalyst CNT yarn had a significantly higher specific conductivity. 2010-12-01 English text Wright State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=wright1290546481 http://rave.ohiolink.edu/etdc/view?acc_num=wright1290546481 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Physics carbon nanotube CNT carbon yarn fiber bulk conduction mechanism conductivity frequency temperature dependence versus graphitic intercalation compounds annealing forest growth floating catalyst super acid LCR network analyzer |
| spellingShingle |
Physics carbon nanotube CNT carbon yarn fiber bulk conduction mechanism conductivity frequency temperature dependence versus graphitic intercalation compounds annealing forest growth floating catalyst super acid LCR network analyzer Bulmer, John Simmons Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials |
| author |
Bulmer, John Simmons |
| author_facet |
Bulmer, John Simmons |
| author_sort |
Bulmer, John Simmons |
| title |
Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials |
| title_short |
Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials |
| title_full |
Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials |
| title_fullStr |
Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials |
| title_full_unstemmed |
Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials |
| title_sort |
temperature and frequency dependent conduction mechanisms within bulk carbon nanotube materials |
| publisher |
Wright State University / OhioLINK |
| publishDate |
2010 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=wright1290546481 |
| work_keys_str_mv |
AT bulmerjohnsimmons temperatureandfrequencydependentconductionmechanismswithinbulkcarbonnanotubematerials |
| _version_ |
1719434089413476352 |