Investigating the Use of Carbon Nanotubes in MRI Receiver Coils

Aly Saad Aly, Mohammed and Lopez-Rios, Nobardo and Weyers, Daniel and Rasheed, Sarbast and Abdul-Rahman, Eihab and Hajian, Arsen (2011) Investigating the Use of Carbon Nanotubes in MRI Receiver Coils. In: International Society for Magnetic Resonance in Medicine ISMRM 2011, May 7-13, 2011, Montreal, Quebec, Canada.

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Single-wall carbon nanotubes (SWCNT) demonstrate intriguing electrical properties that may be useful to MR coil designers. Recent literature revealed that charge transport in SWCNTs networks has minimum scattering, leading to expectations of high electrical conductivity [1]. It is thought that replacing or coating copper coils with a sufficient thickness layer of highly conductive SWCNT in RF receiver coil might enhance the coil’s overall conductivity and contribute to improving the coil quality factor. As frequency increases, copper suffers from the skin and proximity effects, which negatively influence its resistance and inductance. Furthermore, Cu becomes highly sensitive to signal frequency, therefore affecting the coil’s performance. Literature indicates that the skin effect in CNT bundles is significantly reduced compared to that in conventional metal conductors [2, 3], which make them attractive for high-frequency applications, specifically high-quality factor inductor design. The unique high-frequency properties of CNTs arise due to their large momentum relaxation time (leading to large kinetic inductance) [3], which causes the skin depth to saturate with frequency and, thereby, limits resistance increases at high frequencies. [1] M Jaiswal, W Wang, K. A. Shiral Fernando, Y.-P. Sun and R. Menon, “Charge transport in transparent single-wall carbon nanotube networks”, Journal of Physics: Condensed Matter, Vol. 19, No. 44, pp. 446006, 2007. [2] H. Li and K. Banerjee, “High--frequency analysis of carbon nanotube interconnects and implications for on-chip inductor design”, IEEE Transactions on Electron Devices, Vol. 56, No. 10, pp. 2202-2214, Oct. 2009. [3] R. Viswanathan, B. Goldstein, K. Anderson, M. J. Bronskill, R. Baughman, M. Zhang, S. Fang, A. Zakhidov, and A. Aliev, "Beyond copper: MR imaging with carbon nanotube receiver coils", Proceedings, ISMRM 2009, p. 504.

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Depositing User: Dr. Sarbast Rasheed
Date Deposited: 29 Aug 2016 08:05
Last Modified: 29 Aug 2016 08:05

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