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Open Access Nano Express

Wet chemical synthesis and magnetic properties of single crystal Co nanochains with surface amorphous passivation Co layers

Shao-Min Zhou*, Shi-Yun Lou, Yong-Qiang Wang, Xi-Liang Chen, Li-Sheng Liu and Hong-Lei Yuan

Author Affiliations

Key Lab for Special Functional Materials of Ministry of Education, Henan University, 475004 Kaifeng, People's Republic of China

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Nanoscale Research Letters 2011, 6:285  doi:10.1186/1556-276X-6-285

Published: 4 April 2011

Abstract

In this study, for the first time, high-yield chain-like one-dimensional (1D) Co nanostructures without any impurity have been produced by means of a solution dispersion approach under permanent-magnet. Size, morphology, component, and structure of the as-made samples have been confirmed by several techniques, and nanochains (NCs) with diameter of approximately 60 nm consisting of single-crystalline Co and amorphous Co-capped layer (about 3 nm) have been materialized. The as-synthesized Co samples do not include any other adulterants. The high-quality NC growth mechanism is proposed to be driven by magnetostatic interaction because NC can be reorganized under a weak magnetic field. Room-temperature-enhanced coercivity of NCs was observed, which is considered to have potential applications in spin filtering, high density magnetic recording, and nanosensors.

PACS: 61.46.Df; 75.50; 81.07.Vb; 81.07.