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Journal of Nanomaterials
Volume 2015, Article ID 404698, 7 pages
http://dx.doi.org/10.1155/2015/404698
Research Article

Preparation and Microwave Absorbing Properties of an Electroless Ni-Co Coating on Multiwall Carbon Nanotubes Using [Ag(NH3)2]+ as Activator

Department of Chemistry, School of Science, North University of China, Taiyuan 030051, China

Received 16 December 2014; Accepted 17 April 2015

Academic Editor: Taeseup Song

Copyright © 2015 Qiao-ling Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Ni-Co-coated carbon nanotubes (CNTs) composites with different molar ratios of Ni/Co were synthesized using [Ag(NH3)2]+ as activator and as reductant, thereby replacing the conventional noble metal Pd salt activator and Sn2+ reductant. Scanning electron microscopy, X-ray diffraction, and X-ray energy dispersive spectrometry analyses demonstrated that the CNTs were deposited with a dense, uniform Ni-Co coating. The possible mechanism of the electroless method was studied, which indicates that pure Ag0 acted as a nucleation site for subsequent Ni-Co-P deposition. Network vector analyzer measurements indicated that the composite with only Ni coated had an absorbing value of −12.6 dB and the composite with a Ni/Co ratio of four had the maximum wave absorption (−15.6 dB) and the widest absorption bandwidth (800 MHz, RL < −10 dB), while the saturation magnetization (Ms) was 4.28 emug−1 and the coercive force (Hc) was 31.33 Oe.