Microwave conductivity of sorted CNT assemblies.
Recent progress with tailored growth and post-process sorting enables carbon nanotube (CNT) assemblies with predominantly metallic or semi-conducting concentrations. Cryogenic and microwave measurements performed here show transport dimensionality and overall order increasing with increasing metallic concentration, even in atmospheric doping conditions. By 120 GHz, the conductivity of predominantly semi-conducting assemblies grew to 400% its DC value at an increasing growth rate, while other concentrations a growth rate that tapered off. A generalized Drude model fits to the different frequency dependent behaviors and yields useful quality control parameters such as plasma frequency, mean free path, and degree of localization. As one of the first demonstrations of waveguides fabricated from this material, sorted CNTs from both as-made and post-process sources were inserted into sections of practical micro-strip. With both sources, sorted CNT micro-strip increasingly outperformed the unsorted with increasing frequency-- illustrating that sorted CNT assemblies will be important for high frequency applications.
Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
John S
JS
Bulmer
Anritsu Corporation, 490 Jarvis Dr Morgan Hill, CA 95037.
Jon
J
Martens
Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
Lukasz
L
Kurzepa
Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
Tomasz
T
Gizewski
1] Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK [2] American University of Sharjah, Department of Physics, UAE, PO26666.
M
M
Egilmez
Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
M G
MG
Blamire
Universiti Teknologi PETRONAS, Department of Fundamental and Applied Science, Bandar Seri Iskandar, 31750, Tronoh, Perak, Malaysia.
Noorhana
N
Yahya
Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
Krzysztof K K
KK
Koziol
D004553:Electric Conductivity; D008872:Microwaves; D037742:Nanotubes, Carbon / Q000737:chemistry*
D037742:Nanotubes, Carbon