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Growth and Characterization of Cobalt-filled Carbon Nanotubes Prepared by a Simple Catalytic Method

Published online by Cambridge University Press:  15 February 2011

Xicheng Ma ,
Yuanhua Cai ,
Xia Li ,
Ning Lun  and
Shulin Wen
Xicheng Ma
Affiliation:
School of Chemistry and Chemical Engineering Shandong University, Jinan 250061, PR China
Yuanhua Cai
Affiliation:
School of Material Science and Engineering, Characterization and Analysis Center for Materials
Xia Li
Affiliation:
School of Material Science and Engineering, Characterization and Analysis Center for Materials
Ning Lun
Affiliation:
School of Material Science and Engineering, Characterization and Analysis Center for Materials
Shulin Wen
Affiliation:
School of Material Science and Engineering, Characterization and Analysis Center for Materials
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Abstract

High-quality cobalt-filled carbon nanotubes (CNTs) were prepared in situ in the decomposition of benzene over Co/silica-gel nano-scale catalysts. Unlike the previous reports, the catalysts needn't be pre-reduced prior to the forming of Co-filled CNTs, thus the advantage of this method is that Co-filled CNTs can be produced in one step, at a relatively low cost. Transmission electron microscopy (TEM) investigation showed that the products contained abundance of CNTs and most of them were filled with metallic nanoparticles or nanorods. High-resolution TEM (HRTEM), selected area electron diffraction (SAED) patterns and energy dispersive X-ray spectroscopy (EDS) confirmed the presence of Co inside the nanotubes. The encapsulated Co was further identified always as high temperature alpha-Co phase with fcc structure, which frequently consists of twinned boundaries and stacking faults. Based on the experimental results, a possible growth mechanism of the Co-filled CNTs was proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 776: Symposium Q – Unconventional Approaches to Nanostructures with Applications in Electronics, Photonics, Information Storage and Sensing , 2003 , Q8.17
Copyright
Copyright © Materials Research Society 2003

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