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Issue 3, 2013
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Super-stable ultrafine beta-tungsten nanocrystals with metastable phase and related magnetism

J. Xiao,a  P. Liu,a  Y. Liang,a  H. B. Lia  and  G. W. Yang*a 
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* Corresponding authors

a State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, Nanotechnology Research Center, School of Physics & Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
E-mail: stsygw@mail.sysu.edu.cn

Abstract

Ultrafine tungsten nanocrystals (average size of 3 nm) with a metastable phase (beta-tungsten with A15 structure, β-W) have been prepared by laser ablation of tungsten in liquid nitrogen. The as-prepared metastable nanocrystals exhibited super-stablity, and can keep the same metastable structure over a period of 6 months at room temperature. This super-stability is attributed to the nanosized confinement effect of ultrafine nanocrystals. The magnetism measurements showed that the β-W nanocrystals have weak ferromagnetic properties at 2 K, which may arise from surface defects and unpaired electrons on the surface of the ultrafine nanocrystals. These findings provided useful information for the application of ultrafine β-W nanocrystals in microelectronics and spintronics.

Graphical abstract: Super-stable ultrafine beta-tungsten nanocrystals with metastable phase and related magnetism

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Publication details

The article was received on 05 Nov 2012, accepted on 05 Dec 2012 and first published on 07 Dec 2012


Article type: Communication
DOI: 10.1039/C2NR33484D
Citation: Nanoscale, 2013,5, 899-903
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    Super-stable ultrafine beta-tungsten nanocrystals with metastable phase and related magnetism

    J. Xiao, P. Liu, Y. Liang, H. B. Li and G. W. Yang, Nanoscale, 2013, 5, 899
    DOI: 10.1039/C2NR33484D

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