Graphene platelets/aluminium nitride metacomposites with double percolation property of thermal and electrical conductivity
Author(s)
Yin, Rui
Zhang, Yubai
Zhao, Wen
Huang, Xiaoshuai
Li, Xiaomin
Qian, Lei
Griffith University Author(s)
Year published
2018
Metadata
Show full item recordAbstract
Graphene platelets/aluminium nitride (GPLs/AlN) metacomposites with double percolation property of thermal
and electrical conductivity were successfully fabricated by spark plasma sintering. Microstructures and phase
composition of the GPLs/AlN metacomposites were investigated by field emission scanning electron microscopy,
X-ray diffraction and Raman spectroscopy. With increase of the GPLs contents, the double percolation property
of thermal (19.27 wt% GPL) and electrical conductivity (19.03 wt% GPL) was found. Moreover, the negative
permittivity behavior was also observed when the GPLs content reached 19.50 wt%, which was ...
View more >Graphene platelets/aluminium nitride (GPLs/AlN) metacomposites with double percolation property of thermal and electrical conductivity were successfully fabricated by spark plasma sintering. Microstructures and phase composition of the GPLs/AlN metacomposites were investigated by field emission scanning electron microscopy, X-ray diffraction and Raman spectroscopy. With increase of the GPLs contents, the double percolation property of thermal (19.27 wt% GPL) and electrical conductivity (19.03 wt% GPL) was found. Moreover, the negative permittivity behavior was also observed when the GPLs content reached 19.50 wt%, which was attributed to the formation of continuous GPLs networks. Finally, the equivalent circuit models were used to analyze the negative permittivity behavior. As the reactance (Z′′) converted from negative to positive, the inductors were introduced into the equivalent circuit models, and the GPLs/AlN metacomposites went through the capacitive-inductive transition with the increasing GPLs content, corresponding to the negative permittivity behavior.
View less >
View more >Graphene platelets/aluminium nitride (GPLs/AlN) metacomposites with double percolation property of thermal and electrical conductivity were successfully fabricated by spark plasma sintering. Microstructures and phase composition of the GPLs/AlN metacomposites were investigated by field emission scanning electron microscopy, X-ray diffraction and Raman spectroscopy. With increase of the GPLs contents, the double percolation property of thermal (19.27 wt% GPL) and electrical conductivity (19.03 wt% GPL) was found. Moreover, the negative permittivity behavior was also observed when the GPLs content reached 19.50 wt%, which was attributed to the formation of continuous GPLs networks. Finally, the equivalent circuit models were used to analyze the negative permittivity behavior. As the reactance (Z′′) converted from negative to positive, the inductors were introduced into the equivalent circuit models, and the GPLs/AlN metacomposites went through the capacitive-inductive transition with the increasing GPLs content, corresponding to the negative permittivity behavior.
View less >
Journal Title
Journal of the European Ceramic Society
Volume
14
Subject
Materials engineering
Materials engineering not elsewhere classified
Double percolation
Aluminum nitride
Graphene platelets
Negative permittivity