CUED Publications database

Microwave conductivity of sorted CNT assemblies.

Bulmer, JS and Martens, J and Kurzepa, L and Gizewski, T and Egilmez, M and Blamire, MG and Yahya, N and Koziol, KKK (2013) Microwave conductivity of sorted CNT assemblies. Sci Rep, 4. 3762-.

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: Electric Conductivity Microwaves Nanotubes, Carbon
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Div E > Manufacturing Systems
Div E > Production Processes
Depositing User: Cron Job
Date Deposited: 13 Sep 2017 20:05
Last Modified: 26 Sep 2017 01:41
DOI: