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CARBON NANOTUBES

Oxidized Graphite Nanoplatelets as an Improved Filler for Thermally Conducting Epoxy-Matrix Composites

[+] Author and Article Information
Xiaobo Sun, Palanisamy Ramesh, Elena Bekyarova, Mikhail E. Itkis

Center for Nanoscale Science and Engineering, Departments of Chemistry and Chemical and Environmental Engineering,  University of California-Riverside, Riverside, CA 92521

Aiping Yu

Department of Chemical Engineering,  University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada

Robert C. Haddon1

Center for Nanoscale Science and Engineering, Departments of Chemistry and Chemical and Environmental Engineering,  University of California-Riverside, Riverside, CA 92521haddon@ucr.edu

1

Corresponding author.

J. Electron. Packag 133(2), 020905 (Jun 07, 2011) (6 pages) doi:10.1115/1.4003988 History: Received April 04, 2010; Revised March 23, 2011; Published June 07, 2011; Online June 07, 2011

We report a 40% improvement of the thermal conductivity of graphite nanoplatelets–epoxy composites by chemical functionalization of graphite nanoplatelets utilizing nitric acid treatment, which also serves to enhance the spreadability of the material. FTIR and Raman spectroscopy confirmed the presence of a variety of oxygen functional groups at the edges and basal plane of the functionalized graphite nanoplatelets, which contributed to improved interaction with the polymer matrix. A comparative statistical analysis of the particle size distributions in pristine and functionalized graphite nanoplatelets based on scanning electron microscopy showed an increasing degree of exfoliation of the functionalized material. We compare the performance of the functionalized graphite nanoplatelets and carbon nanotubes as fillers in the polymer matrix and discuss the prospects for utilization of graphite nanoplatelets-based thermal interface materials in electronic packaging.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

FTIR spectra of GNPs and nitric acid treated GNPs − GNPOX

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Figure 2

Raman spectra of GNPs and nitric acid treated GNPs − GNPOX

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Figure 3

Thermal conductivities of GNP-epoxy with GNP filler before and after oxidation at 5 and 10 wt.% filler loading in comparison with thermal conductivity of neat epoxy. The increase of thermal conductivity due to oxidation of GNPs Δκox is shown by cross-hatching.

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Figure 4

SEM images of graphite nanoplatelets before (a)–(c) and after (d)–(f) oxidation. Note increasing magnification from left to right with corresponding scale bars: (a), (d): 100 μm; (b), (e): 20 μm; (c), (f): 5 μm.

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Figure 5

Lateral particle size distribution of GNPs before (a) and after (b) oxidation. Pie charts of volume distribution of GNPs before (c) and after (d) oxidation.

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Figure 6

(a) Thermal conductivity enhancement of epoxy composites for SWNT, GNP, hybrid GNP-SWNT, and GNPOX nanofillers at 10 wt.% filler loading; (b) comparison of spreadabilities for epoxy pastes with different nanofillers indicated in the figure at 10 wt.% filler loading under 0.42 MPa pressure.

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