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Open Access Nano Express

Synthesis and Characterization of Magnetic Metal-encapsulated Multi-walled Carbon Nanobeads

A Leela Mohana Reddy and S Ramaprabhu*

Author Affiliations

Department of Physics, Alternative Energy Technology Laboratory, Indian Institute of Technology Madras, Chennai, 600036, India

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Nanoscale Research Letters 2008, 3:76-81  doi:10.1007/s11671-008-9116-6

Published: 26 January 2008

Abstract

A novel, cost-effective, easy and single-step process for the synthesis of large quantities of magnetic metal-encapsulated multi-walled carbon nanobeads (MWNB) and multi-walled carbon nanotubes (MWNT) using catalytic chemical vapour deposition of methane over Mischmetal-based AB3alloy hydride catalyst is presented. The growth mechanism of metal-encapsulated MWNB and MWNT has been discussed based on the catalytically controlled root-growth mode. These carbon nanostructures have been characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM and HRTEM), energy dispersive analysis of X-ray (EDAX) and thermogravimetric analysis (TGA). Magnetic properties of metal-filled nanobeads have been studied using PAR vibrating sample magnetometer up to a magnetic field of 10 kOe, and the results have been compared with those of metal-filled MWNT.

Keywords:
Magnetic metal-filled multi-walled carbon nanobeads (MWNB); Alloy hydride catalyst; Chemical vapour deposition; Magnetization