Title :
Microwave characterization of multi-walled carbon nanotube arrays
Author :
Katsounaros, Anestis ; Rajab, Khalid Z. ; Hao, Yang ; Mann, Mark ; Milne, William I.
Author_Institution :
Sch. of Electron. Eng. & Comput. Sci., Queen Mary Univ. of London, London, UK
Abstract :
A vertically aligned multi-walled carbon nanotube (VACNT) film has been characterized by rectangular waveguide measurements. The complex scattering parameters (S-parameters) are measured by a vector network analyzer at X-band frequencies. The effective complex permittivity and permeability of the VACNT film have been extracted using the Nicolson-Ross-Weir (NWR) approach. The extracted parameters are verified by full wave simulations (CST - Microwave Studio) and very good agreement has been obtained. A systematic error analysis is presented and the errors are within the acceptable range. The performance of VACNT films as an absorber is examined, and comparison with the conventional carbon loaded materials shows that a 90% size reduction is possible whilst maintaining the same absorption level.
Keywords :
S-parameters; carbon nanotubes; measurement errors; network analysers; permittivity; rectangular waveguides; Nicolson-Ross-Weir approach; S-parameters; X-band frequencies; complex scattering parameters; effective complex permittivity; full wave simulations; microwave characterization; permeability; rectangular waveguide measurements; systematic error analysis; vector network analyzer; vertically aligned multiwalled carbon nanotube; Carbon nanotubes; Films; Permeability; Permittivity; Permittivity measurement; Scattering parameters; absorption; permeability; permittivity; vertically aligned multiwalled carbon nanotubes (VACNT); waveguide;
Conference_Titel :
Microwave Conference (EuMC), 2011 41st European
Conference_Location :
Manchester
Print_ISBN :
978-1-61284-235-6
