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Title: Effects of functional group mass variance on vibrational properties and thermal transport in graphene

Journal Article · · Physical Review B
 [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  2. Jinan Univ., Guangzhou, Guangdong (China). School of Mechanics and Construction Engineering

Intrinsic thermal resistivity critically depends on features of phonon dispersions dictated by harmonic interatomic forces and masses. We present the effects of functional group mass variance on vibrational properties and thermal conductivity (κ ) of functionalized graphene from first principles calculations. We also use graphane, a buckled graphene backbone with covalently bonded Hydrogen atoms on both sides, as the base material and vary the mass of the Hydrogen atoms to simulate the effect of mass variance from other functional groups. We find non-monotonic behavior of κ with increasing mass of the functional group and an unusual cross-over from acoustic-dominated to optic-dominated thermal transport behavior. We connect this cross-over to changes in the phonon dispersion with varying mass which suppress acoustic phonon velocities, but also give unusually high velocity optic modes. Further, we show that out-of-plane acoustic vibrations contribute significantly more to thermal transport than in-plane acoustic modes despite breaking of a reflection symmetry based scattering selection rule responsible for their large contributions in graphene. Our work demonstrates the potential for manipulation and engineering of thermal transport properties in two dimensional materials toward targeted applications.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231
OSTI ID:
1347327
Alternate ID(s):
OSTI ID: 1346767
Journal Information:
Physical Review B, Vol. 95, Issue 12; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (5)

2D Boron Sheets: Structure, Growth, and Electronic and Thermal Transport Properties journal August 2019
Giant thermal conductivity in diamane and the influence of horizontal reflection symmetry on phonon scattering journal January 2019
Suppressed thermal conductivity in fluorinated diamane: Optical phonon dominant thermal transport journal October 2019
Ab initio phonon thermal transport in monolayer InSe, GaSe, GaS, and alloys journal October 2017
Anomalously temperature-dependent thermal conductivity of monolayer GaN with large deviations from the traditional 1 / T law journal May 2017

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