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Basal-plane thermal conductivity of nanocrystalline and amorphized thin germanane

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4963704· OSTI ID:1327610
 [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
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.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725; FG02-07ER46377
OSTI ID:
1327610
Alternate ID(s):
OSTI ID: 1327552
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 13 Vol. 109; ISSN APPLAB; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Recent Progress on Germanene and Functionalized Germanene: Preparation, Characterizations, Applications, and Challenges journal February 2019
Tunable gap in stable arsenene nanoribbons opens the door to electronic applications journal January 2019
Identification of turbostratic twisting in germanane journal January 2019
Optoelectronic properties of methyl-terminated germanane journal July 2019

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