Controllable preparation of tungsten/tungsten carbide nanowires or nanodots in nanostructured carbon with hollow macroporous core/mesoporous shell

doi:10.1088/1674-1056/26/3/038103

中国物理B ›› 2017, Vol. 26 ›› Issue (3): 38103-038103.doi: 10.1088/1674-1056/26/3/038103

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Controllable preparation of tungsten/tungsten carbide nanowires or nanodots in nanostructured carbon with hollow macroporous core/mesoporous shell

Xiao-Na Ren(任晓娜), Min Xia(夏敏), Qing-Zhi Yan(燕青芝), Chang-Chun Ge(葛昌纯)

Institute of Nuclear Energy and New Energy System Materials, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China

收稿日期:2016-11-04 修回日期:2016-12-22 出版日期:2017-03-05 发布日期:2017-03-05
通讯作者: Min Xia, Chang-Chun Ge E-mail:xmdsg@ustb.edu.cn;ccge@mater.ustb.edu.cn

Controllable preparation of tungsten/tungsten carbide nanowires or nanodots in nanostructured carbon with hollow macroporous core/mesoporous shell

Xiao-Na Ren(任晓娜), Min Xia(夏敏), Qing-Zhi Yan(燕青芝), Chang-Chun Ge(葛昌纯)

Institute of Nuclear Energy and New Energy System Materials, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2016-11-04 Revised:2016-12-22 Online:2017-03-05 Published:2017-03-05
Contact: Min Xia, Chang-Chun Ge E-mail:xmdsg@ustb.edu.cn;ccge@mater.ustb.edu.cn

摘要/Abstract

摘要：

Large scale tungsten nanowires and tungsten nanodots are prepared in a controllable way. The preparation is based on mechanisms of chemical vapor transportation and phase transformation during the reduction of ammonium metatungstate (AMT) in H₂. The AMT is first encapsulated into the hollow core of nanostructured carbon with hollow macroporous core/mesoporous shell (NC-HMC/MS) and forms nanorods, which are the precursors of both tungsten nanowires and tungsten nanodots. Just by controlling H₂ flow rate and heating rate in the reduction process, the AMT nanorods could turn into nanowires (under low rate condition) or nanodots (under high rate condition). Besides, via heat treatment at 1200℃, the as-obtained nano-sized tungsten could convert into W₂C nanorods or WC nanodots respectively. Furthermore, the diameter of the as-obtained tungsten or tungsten carbide is confined within 50 nm by the NC-HMC/MS, and no agglomeration appears in the obtained nanomaterials.

关键词: tungsten nanowires, tungsten nanodots, mesoporous carbon, self-assembly

Abstract:

Key words: tungsten nanowires, tungsten nanodots, mesoporous carbon, self-assembly

中图分类号: (Nanoscale materials and structures: fabrication and characterization)

81.07.-b

81.07.Gf (Nanowires) 81.10.St (Growth in controlled gaseous atmospheres) 81.16.Dn (Self-assembly)

任晓娜, 夏敏, 燕青芝, 葛昌纯. Controllable preparation of tungsten/tungsten carbide nanowires or nanodots in nanostructured carbon with hollow macroporous core/mesoporous shell[J]. 中国物理B, 2017, 26(3): 38103-038103.

Xiao-Na Ren(任晓娜), Min Xia(夏敏), Qing-Zhi Yan(燕青芝), Chang-Chun Ge(葛昌纯). Controllable preparation of tungsten/tungsten carbide nanowires or nanodots in nanostructured carbon with hollow macroporous core/mesoporous shell[J]. Chin. Phys. B, 2017, 26(3): 38103-038103.

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Controllable preparation of tungsten/tungsten carbide nanowires or nanodots in nanostructured carbon with hollow macroporous core/mesoporous shell

Controllable preparation of tungsten/tungsten carbide nanowires or nanodots in nanostructured carbon with hollow macroporous core/mesoporous shell

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