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Thermal conductivity of benzothieno-benzothiophene derivatives at the nanoscale.

Author information

Affiliations

  • 1. Institute for Electronics Microelectronics and Nanotechnology (IEMN), CNRS, Av. Poincaré, Villeneuve d'Ascq, France.
      Authors
    • Gueye MN 1
    • Guérin D 1
    • Lenfant S 1
    • Vuillaume D 1
    (4 authors)
  • 2. Laboratory for Chemistry of Novel Materials, University of Mons, Place du Parc 20, Mons, Belgium.
      Authors
    • Vercouter A 2
    • Lemaur V 2
    • Cornil J 2
    (3 authors)
  • 3. Laboratoire de Chimie des Polymères, Faculté des Sciences, Université Libre de Bruxelles (ULB), Boulevard du Triomphe, 1050, Brussels, Belgium.
      Authors
    • Jouclas R 3
    • Schweicher G 3
    (2 authors)
  • 4. Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193, Barcelona, Spain.
      Authors
    • Antidormi A 4
    (1 author)
  • 5. Laboratoire de Chimie des Polymères, Faculté des Sciences, Université Libre de Bruxelles (ULB), Boulevard du Triomphe, 1050, Brussels, Belgium.and International Solvay Institutes for Physics and Chemistry, Brussels, Belgium.
      Authors
    • Geerts Y 5
    (1 author)
    • Show all (6)

ORCIDs linked to this article

Show all (12)

Nanoscale, 10 Feb 2021, 13(6):3800-3807
https://doi.org/10.1039/d0nr08619c PMID: 33565562 

Abstract 

We study by scanning thermal microscopy the nanoscale thermal conductance of films (40-400 nm thick) of [1]benzothieno[3,2-b][1]benzothiophene (BTBT) and 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT-C8). We demonstrate that the out-of-plane thermal conductivity is significant along the interlayer direction, larger for BTBT (0.63 ± 0.12 W m-1 K-1) compared to C8-BTBT-C8 (0.25 ± 0.13 W m-1 K-1). These results are supported by molecular dynamics calculations (approach to equilibrium molecular dynamics method) performed on the corresponding molecular crystals. The calculations point to significant thermal conductivity (3D-like) values along the 3 crystalline directions, with anisotropy factors between the crystalline directions below 1.8 for BTBT and below 2.8 for C8-BTBT-C8, in deep contrast with the charge transport properties featuring a two-dimensional character for these materials. In agreement with the experiments, the calculations yield larger values in BTBT compared to C8-BTBT-C8 (0.6-1.3 W m-1 K-1versus 0.3-0.7 W m-1 K-1, respectively). The weak thickness dependence of the nanoscale thermal resistance is in agreement with a simple analytical model.

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Read article at publisher's site: https://doi.org/10.1039/d0nr08619c

Read article for free, from open access legal sources, via Unpaywall: https://arxiv.org/pdf/2102.05377Unpaywall

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Funding 

Funders who supported this work.

Agence Nationale de la Recherche (1)

Fonds De La Recherche Scientifique - FNRS (6)