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Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials

Bulmer, John Simmons
http://rave.ohiolink.edu/etdc/view?acc_num=wright1290546481

Abstract Details

2010, Master of Science (MS), Wright State University, Physics.
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.
Gregory Kozlowski, PhD (Advisor)
Jerry Clark, PhD (Committee Member)
Benji Maruyama, PhD (Committee Member)
Jason Deibel, PhD (Committee Member)
Andrew Hsu, PhD (Other)
Lok Lew Yan Voon, PhD (Other)
72 p.
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

Recommended Citations

Citations

  • Bulmer, J. S. (2010). Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1290546481

    APA Style (7th edition)

  • Bulmer, John. Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials. 2010. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1290546481.

    MLA Style (8th edition)

  • Bulmer, John. "Temperature and Frequency Dependent Conduction Mechanisms Within Bulk Carbon Nanotube Materials." Master's thesis, Wright State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1290546481

    Chicago Manual of Style (17th edition)

wright1290546481
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© 2010, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.