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This content will become publicly available on September 30, 2017

Title: Basal-plane thermal conductivity of nanocrystalline and amorphized thin germanane

Recently, we synthesized Germanane (GeH), a hydrogen-terminated layered germanium structure. We employed a four-probe thermal transport measurement method to obtain the basal-plane thermal conductivity of thin exfoliated GeH flakes and correlated the measurement results with the crystal structure. Furthermore, the obtained thermal conductivity increases with increasing temperature, suggesting that extrinsic grain boundary and defect scattering dominate intrinsic phonon-phonon scattering. Annealing a polycrystalline GeH sample at 195 C caused it to become amorphous, reducing the room-temperature thermal conductivity from 0.53± 0.03 W m-1 K-1, which is close to the value calculated for 3.3 nm grain size, to 0.29± 0.02 W m-1 K-1, which approaches the calculated amorphous limit in the basal plane thermal conductivity.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [1] ;  [1] ;  [2] ;  [5] ;  [3] ;  [4] ;  [6] ;  [2] ;  [1]
  1. Univ. of Texas, Austin, TX (United States). Dept. of Mechanical Engineering
  2. The Ohio State Univ., Columbus, OH (United States); Dept. of Chemistry
  3. French Atomic and Alternative Energy Commission, Grenoble (France)
  4. Boston College, Chestnut Hill, MA (United States). Dept. of Physics
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. The Ohio State Univ., Columbus, OH (United States). Dept. of Mechanical and Aerospace Engineering
Publication Date:
OSTI Identifier:
1327610
Grant/Contract Number:
AC05-00OR22725; FG02-07ER46377
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 13; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY