Electrical conductivity and microwave absorption of shortened multi-walled carbon nanotube/alumina ceramic composites

Song Bi; Xunjia Su; Genliang Hou; Chaohui Liu; Wei Li Song; Mao Sheng Cao

doi:10.1016/j.ceramint.2012.12.057

Electrical conductivity and microwave absorption of shortened multi-walled carbon nanotube/alumina ceramic composites

Song Bi^*, Xunjia Su, Genliang Hou, Chaohui Liu, Wei Li Song, Mao Sheng Cao

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

67 Citations (Scopus)

Abstract

Multi-walled carbon nanotubes (MWCNTs) snipped by the acidification process were fabricated into alumina (Al₂O₃) matrices via hydrothermal crystallization and hot-pressing techniques for achieving MWCNT/Al₂O₃ composites. The electrical conductivity and complex permittivity of the as-fabricated composites were investigated in the range of 8.2-12.4 GHz, and the corresponding microwave reflection loss was evaluated. Compared to the pristine MWCNT/Al₂O₃ composites, the percolation threshold of electrical conductivity was observed to increase from the range of 0.094-2.5 wt% to 3.89 wt%, mainly owing to the decrease of MWCNT aggregations based on the shortened tubes. The resulting shortened MWCNTs/Al₂O₃ were found to demonstrate strong microwave absorption in the investigated region.

Original language	English
Pages (from-to)	5979-5983
Number of pages	5
Journal	Ceramics International
Volume	39
Issue number	5
DOIs	https://doi.org/10.1016/j.ceramint.2012.12.057
Publication status	Published - Jul 2013

Keywords

Ceramic composite
Microwave absorption
Percolation threshold
Shortened carbon nanotube

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10.1016/j.ceramint.2012.12.057

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title = "Electrical conductivity and microwave absorption of shortened multi-walled carbon nanotube/alumina ceramic composites",

abstract = "Multi-walled carbon nanotubes (MWCNTs) snipped by the acidification process were fabricated into alumina (Al2O3) matrices via hydrothermal crystallization and hot-pressing techniques for achieving MWCNT/Al2O3 composites. The electrical conductivity and complex permittivity of the as-fabricated composites were investigated in the range of 8.2-12.4 GHz, and the corresponding microwave reflection loss was evaluated. Compared to the pristine MWCNT/Al2O3 composites, the percolation threshold of electrical conductivity was observed to increase from the range of 0.094-2.5 wt% to 3.89 wt%, mainly owing to the decrease of MWCNT aggregations based on the shortened tubes. The resulting shortened MWCNTs/Al2O3 were found to demonstrate strong microwave absorption in the investigated region.",

keywords = "Ceramic composite, Microwave absorption, Percolation threshold, Shortened carbon nanotube",

author = "Song Bi and Xunjia Su and Genliang Hou and Chaohui Liu and Song, {Wei Li} and Cao, {Mao Sheng}",

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TY - JOUR

T1 - Electrical conductivity and microwave absorption of shortened multi-walled carbon nanotube/alumina ceramic composites

AU - Bi, Song

AU - Su, Xunjia

AU - Hou, Genliang

AU - Liu, Chaohui

AU - Song, Wei Li

AU - Cao, Mao Sheng

PY - 2013/7

Y1 - 2013/7

N2 - Multi-walled carbon nanotubes (MWCNTs) snipped by the acidification process were fabricated into alumina (Al2O3) matrices via hydrothermal crystallization and hot-pressing techniques for achieving MWCNT/Al2O3 composites. The electrical conductivity and complex permittivity of the as-fabricated composites were investigated in the range of 8.2-12.4 GHz, and the corresponding microwave reflection loss was evaluated. Compared to the pristine MWCNT/Al2O3 composites, the percolation threshold of electrical conductivity was observed to increase from the range of 0.094-2.5 wt% to 3.89 wt%, mainly owing to the decrease of MWCNT aggregations based on the shortened tubes. The resulting shortened MWCNTs/Al2O3 were found to demonstrate strong microwave absorption in the investigated region.

AB - Multi-walled carbon nanotubes (MWCNTs) snipped by the acidification process were fabricated into alumina (Al2O3) matrices via hydrothermal crystallization and hot-pressing techniques for achieving MWCNT/Al2O3 composites. The electrical conductivity and complex permittivity of the as-fabricated composites were investigated in the range of 8.2-12.4 GHz, and the corresponding microwave reflection loss was evaluated. Compared to the pristine MWCNT/Al2O3 composites, the percolation threshold of electrical conductivity was observed to increase from the range of 0.094-2.5 wt% to 3.89 wt%, mainly owing to the decrease of MWCNT aggregations based on the shortened tubes. The resulting shortened MWCNTs/Al2O3 were found to demonstrate strong microwave absorption in the investigated region.

KW - Ceramic composite

KW - Microwave absorption

KW - Percolation threshold

KW - Shortened carbon nanotube

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DO - 10.1016/j.ceramint.2012.12.057

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VL - 39

SP - 5979

EP - 5983

JO - Ceramics International

JF - Ceramics International

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ER -

Electrical conductivity and microwave absorption of shortened multi-walled carbon nanotube/alumina ceramic composites

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Keywords

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