Journal
NATURE MATERIALS
Volume 11, Issue 3, Pages 203-207Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3207
Keywords
-
Categories
Funding
- National Science Foundation [1006350]
- W. M. Keck Foundation
- Office of Naval Research
- National Natural Science Foundation of China [91123009, 111104228, 10975115, 60827004, 90921002]
- '973' program [2012CB619301, 2011CB925600]
- Semiconductor Research Corporation-Defense Advanced Research Project Agency FCRP Functional Engineered Nano Architectonic centre, National Science Foundation
- US Office of Naval Research
- NRF of Korea through WCU [R-31-2008-000-10083-0]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1006350] Funding Source: National Science Foundation
Ask authors/readers for more resources
In addition to its exotic electronic properties(1,2) graphene exhibits unusually high intrinsic thermal conductivity(3-6). The physics of phonons-the main heat carriers in graphene-has been shown to be substantially different in two-dimensional (2D) crystals, such as graphene, from in three-dimensional (3D) graphite(7-10). Here, we report our experimental study of the isotope effects on the thermal properties of graphene. Isotopically modified graphene containing various percentages of C-13 were synthesized by chemical vapour deposition (CVD). The regions of different isotopic compositions were parts of the same graphene sheet to ensure uniformity in material parameters. The thermal conductivity, K, of isotopically pure C-12 (0.01% C-13) graphene determined by the optothermal Raman technique(3-7,10), was higher than 4,000 W mK(-1) at the measured temperature T-m similar to 320 K, and more than a factor of two higher than the value of K in graphene sheets composed of a 50:50 mixture of C-12 and C-13. The experimental data agree well with our molecular dynamics (MD) simulations, corrected for the long-wavelength phonon contributions by means of the Klemens model. The experimental results are expected to stimulate further studies aimed at a better understanding of thermal phenomena in 2D crystals.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available