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- Title
Enhancement of short/medium-range order and thermal conductivity in ultrahard sp<sup>3</sup> amorphous carbon by C<sub>70</sub> precursor.
- Authors
Shang, Yuchen; Yao, Mingguang; Liu, Zhaodong; Fu, Rong; Yan, Longbiao; Yang, Long; Zhang, Zhongyin; Dong, Jiajun; Zhai, Chunguang; Hou, Xuyuan; Fei, Liting; Zhang, GuanJie; Ji, Jianfeng; Zhu, Jie; Lin, He; Sundqvist, Bertil; Liu, Bingbing
- Abstract
As an advanced amorphous material, sp3 amorphous carbon exhibits exceptional mechanical, thermal and optical properties, but it cannot be synthesized by using traditional processes such as fast cooling liquid carbon and an efficient strategy to tune its structure and properties is thus lacking. Here we show that the structures and physical properties of sp3 amorphous carbon can be modified by changing the concentration of carbon pentagons and hexagons in the fullerene precursor from the topological transition point of view. A highly transparent, nearly pure sp3−hybridized bulk amorphous carbon, which inherits more hexagonal-diamond structural feature, was synthesized from C70 at high pressure and high temperature. This amorphous carbon shows more hexagonal-diamond-like clusters, stronger short/medium-range structural order, and significantly enhanced thermal conductivity (36.3 ± 2.2 W m−1 K−1) and higher hardness (109.8 ± 5.6 GPa) compared to that synthesized from C60. Our work thus provides a valid strategy to modify the microstructure of amorphous solids for desirable properties. sp3 amorphous carbon exhibits exceptional mechanical, thermal, and optical properties, but cannot be synthesized using traditional processes. Here authors report a nearly pure sp3−hybridized amorphous carbon synthesized from C70 which shows more short/medium-range order and enhanced thermal conductivity compared to C60.
- Subjects
THERMAL conductivity; AMORPHOUS substances; AMORPHOUS carbon; THERMAL properties; OPTICAL properties; PENTAGONS
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-42195-5