Structure and electrical conductivity of nitrogen-doped carbon nanofibers
Structure and electrical conductivity of nitrogen-doped carbon nanofibers
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DOI：
10.1016/j.carbon.2009.02.034
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发表时间：
2009-07-01
期刊：
影响因子：
10.9
通讯作者：
Tkachev, Evgeniy N.
中科院分区：
文献类型：
--
作者：
Ismagilov, Zinfer R.;Shalagina, Anastasia E.;Tkachev, Evgeniy N.
研究了碳纳米纤维(CNF)中氮含量对碳材料结构和电学性能的影响。以65Ni-25Cu-10Al(2)O(3)(wt.%)为催化剂，在823K下，乙烯和乙烯混合物与氨水反应，制得了N-CNF和N-CNF，N-CNF的含氮量在0~8.2wt.%之间。随着N-CNF中氮含量的增加，这两种效应都变得更加明显。不同氮含量的N-CNF的导电性是由于在类石墨材料的离域pi体系中引入氮原子和额外的电子掺杂后，纳米纤维类石墨结构的无序竞争所致。因此，当N-CNF中的氮浓度等于3.1wt.%(C)2009Elsevier Ltd.时，所研究的样品的电导率最大。保留所有权利。
The effect of nitrogen concentration in carbon nanofibers (CNFs) on the structural and electrical properties of the carbon material was studied. CNFs with nitrogen concentration varied from 0 to 8.2 wt.% (N-CNFs) with "herringbone" structure were prepared by decomposition of ethylene and ethylene mixture with ammonia over 65Ni-25Cu-10Al(2)O(3) (wt.%) catalyst at 823 K. Detailed investigation of the CNFs and N-CNFs by XPS, FTIR and Raman spectroscopy showed that the nitrogen introduction in carbon material distorts the graphite-like lattice and increases the structure defectiveness. Both effects become more significant as the nitrogen concentration in N-CNFs grows.The electrical conductivity of N-CNFs with different nitrogen concentrations is caused by the competition of the nanofiber graphite-like structure disordering after introduction of nitrogen atoms and doping of an additional electron into the delocalized pi-system of the graphite-like material. As a result, the maximum electrical conductivity among the samples studied was observed at nitrogen concentration in N-CNFs equal to 3.1 wt.% (C) 2009 Elsevier Ltd. All rights reserved.