Microwave conductivity of sorted CNT assemblies.

Microwave conductivity of sorted CNT assemblies.
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DOI:
10.1038/srep03762
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发表时间:
2014-01-21
期刊:
影响因子:
4.6
通讯作者:
Koziol KK
Koziol KK
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bulmer JS;Martens J;Kurzepa L;Gizewski T;Egilmez M;Blamire MG;Yahya N;Koziol KK

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定制生长和后处理分选的最新进展使碳纳米管(CNT)组件具有主要的金属或半导体浓度。低温和微波测量在这里进行的运输维数和整体秩序随着金属浓度的增加,即使在大气掺杂条件下。到120 GHz时,主要半导体组件的电导率以不断增加的增长率增长到其DC值的400%,而其他浓度的增长率逐渐减弱。广义Drude模型适合于不同的频率依赖性行为,并产生有用的质量控制参数,如等离子体频率,平均自由程,和本地化程度。作为由这种材料制成的波导的第一个演示之一,将来自制造和后处理来源的分选的CNT插入到实际微带的部分中。对于这两种来源,随着频率的增加,分选的CNT微带越来越优于未分选的CNT微带-说明分选的CNT组件对于高频应用将是重要的。
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.
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