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Effects of pyrocarbon on morphology stability of SiC nanowires at high temperatures
Author(s) -
Cheng Chunyu,
Li Hejun,
Fu Qiangang,
Li Lu,
Guo Liping,
Yin Xuemin,
Tian Xinfa
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15524
Subject(s) - nanowire , nucleation , materials science , layer (electronics) , morphology (biology) , stacking , microstructure , chemical vapor deposition , phase (matter) , nanotechnology , chemical engineering , vapor–liquid–solid method , composite material , chemistry , organic chemistry , biology , engineering , genetics
To understand the effect of pyrocarbon (PyC) on the morphology stability of SiC nanowires at high temperatures (1800‐2100°C), a PyC layer was prepared to wrap the 3C‐SiC nanowire by chemical vapor deposition. The results showed that the existence and thickness of PyC layer played a crucial role in stabilizing the structures and morphology of SiC nanowires. The SiC nanowires without PyC layer transformed to platelet‐shaped structures above 1800°C. The SiC nanowires with a ~1.5 μm PyC layer could keep their structures and morphology at 2100°C, while the SiC nanowires with a ~1 μm PyC layer could not maintain their microstructures at this temperature. The stability of SiC nanowires at high temperature might be related to the vapor phase nucleation, thermodynamics phase transformation and the stacking faults ( SF s) expansion, which could be limited by the PyC layer. Therefore, preparing a protective PyC layer with an appropriate thickness might be a potential method to extend the practical applications of SiC nanowires at high temperatures.