Conversion of carbon nanotubes to diamond by spark plasma sintering

被引：59
|
作者：
Zhang, FM
Shen, J
Sun, JF
Zhu, YQ
Wang, G
McCartney, G
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Univ Nottingham, Sch Mech Mat & Mfg Engn, Nottingham NG7 2RD, England
来源：
CARBON | 2005年 / 43卷 / 06期
基金：
英国工程与自然科学研究理事会; 中国国家自然科学基金;
关键词：
carbon nanotube; carbon onions; diamond; sintering; phase transitions;
D O I：
10.1016/j.carbon.2004.12.019
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The diamond phase has been converted directly from carbon nanotubes by spark plasma sintering (SPS), at 1500 degrees C under 80 MPa pressure, without any catalyst being involved. Well-crystallized diamond crystals, with particle sizes ranging from 300 nm to 10 pro were obtained. After sintering at 1200 degrees C, the tips of the carbon nanotubes were found to be open and the conversion from carbon nanotubes to diamond started. The mechanism for carbon nanotube to diamond conversion in SPS may be described as that from carbon nanotubes to an intermediate phase of carbon nano-onion, and then to diamond. It is believed that the plasmas generated by the low-voltage, vacuum spark, via a pulsed DC in the SPS process, played a critical role in the low pressure diamond formation. This SPS process provides an alternative approach to diamond synthesis. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1254 / 1258
页数：5
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