Wet chemical synthesis and magnetic properties of single crystal Co nanochains with surface amorphous passivation Co layers
Key Lab for Special Functional Materials of Ministry of Education, Henan University, 475004 Kaifeng, People's Republic of China
Nanoscale Research Letters 2011, 6:285 doi:10.1186/1556-276X-6-285Published: 4 April 2011
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.