Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5404085 | Journal of Luminescence | 2007 | 7 Pages |
Abstract
The thermal conductivity of thin-wall glassy carbon and graphitic carbon inverse opals, fabricated by templating of silica opal has been measured in the temperature range 10-400Â K using transient pulse method. The heat flow through 100Â Ã
-thick layers of graphite sheets tiled on spherical surfaces of empty overlapping spheres arrayed in face-centered-cubic lattices has been analyzed in term of anisotropy factor. Taking into account high anisotropy factor in graphite, γ=342, we found that the thermal conductivity of inverse opal prepared by chemical vapor deposition infiltration is limited by heat flow across the graphitic layers in bottleneck, κâ¥=3.95 W/m K. The electronic contribution to the thermal conductivity, κe(300 K)=3.7Ã10â3 W/m K is negligible comparing to the measured value, κ(300 K)=0.33 W/m K. The obtained phonon mean free path, l=90 nm is comparable with the graphite segments between hexagonal array of interconnections.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Ali E. Aliev, Sergey B. Lee, Ray H. Baughman, Anvar A. Zakhidov,