Type of Document Thesis Author Xue, Yuan URN etd-11182007-225656 Title Experimental Study of Electrical Conductivity of Carbon Nanotube, Nanofiber Buckypapers and their Composites Degree Master of Science Department Industrial and Manufacturing Engineering, Department of Advisory Committee
Advisor Name Title Zhiyong Liang Committee Chair Ben Wang Committee Member Chuck Zhang Committee Member Petru Andrei Committee Member Keywords
- Carbon Nanotubes
- Electrical Conductivity
Date of Defense 2007-11-12 Availability unrestricted AbstractThe discovery of carbon nanotubes brought on a whole new world of nanotechnology. Various forms of carbon materials were developed, including single-walled carbon nanotube (SWNT), multi-walled carbon nanotube (MWNT), and carbon nanofiber (CNF). These carbon nanomaterials attract academic and industrial interests because of their exceptional mechanical, thermal and electrical properties. For electrical conductivity in particular, it is widely recognized that SWNTs have considerable potential as building blocks for future nanoscale electronics and conducting composites.
The first objective of this thesis is to develop a comprehensive electrical resistivity measurement system which can measure the electrical resistivity of nanotube-based materials ranging from 1.0E-6 §Ùcm to 1.0E+17 §Ùcm. The test setup performance was examined using Gage R&R (Repeatability and reproducibility) analysis. The second objective is to characterize and analyze electrical conductive properties of different Buckypapers (thin film of nanotube network) and nanocomposites to demonstrate their performance and establish a database for future applications. Detailed characterizations of the electrical conductivities of SWNT, MWNT, and carbon fiber Buckypapers and their composites were conducted. The influential factors of resistivity of Buckypapers were discussed, including the effects of nanotube batches, processing methods, and surfactant types.
In this study, the electrical resistivity properties of the mixed Buckypapers of SWNT/MWNT and SWNT/CNF were also investigated. The effects of nanoparticle types (SWNT, MWNT, and CNF) were examined. The results show that the low cost MWNT and nanofiber materials can still retain good electrical conductivity of the resultant mixed Buckypapers, creating excellent application potentials for developing cost effective multifunctional composites.
The thesis also studied the electrical conductivity of functionalized SWNT Buckypapers. Functionalization of nanotubes was suggested to be an effective way to tune the electrical conductivity of CNTs. The functionalization methods included electron-beam irradiation and fluorinated grafting. The resistivities of the functionalized SWNT Buckypapers were experimentally investigated.
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