DataVXACS Applied Materials & InterfacesPaper
journal article·2017-11-01Open access

Record Low Thermal Conductivity of Polycrystalline MoS2 Films: Tuning the Thermal Conductivity by Grain Orientation

Marianna Sledzinska, Romain Quey, Bohayra Mortazavi, Bartlomiej Graczykowski, Marcel Placidi, David Saleta Reig, Daniel Navarro-Urrios, Francesc Alzina, Luciano Colombo, Stephan Roche, Clivia M. Sotomayor Torres

ACS Applied Materials & Interfaces· Volume 9· Issue 43
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Source abstract

Abstract

We report a record low thermal conductivity in polycrystalline MoS 2 obtained for ultrathin films with varying grain sizes and orientations. By optimizing the sulfurization parameters of nanometer-thick Mo layers, five MoS 2 films containing a combination of horizontally and vertically oriented grains, with respect to the bulk (001) monocrystal, were grown. From transmission electron microscopy, the average grain size, typically below 10 nm, and proportion of differently oriented grains were extracted. The thermal conductivity of the suspended samples was extracted from a Raman laser-power-dependent study, and the lowest value of thermal conductivity of 0.27 W m –1 K –1, which reaches a similar value as that of Teflon, is obtained in a polycrystalline sample formed by a combination of horizontally and vertically oriented grains in similar proportion. Analysis by means of molecular dynamics and finite element method simulations confirm that such a grain arrangement leads to lower grain boundary conductance. We discuss the possible use of these thermal insulating films in the context of electronics and thermoelectricity.
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Research context

Nanomaterials

OpenAlex topics: Thermal properties of materials · Machine Learning in Materials Science · Advanced Thermoelectric Materials and Devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, E-08193 Barcelona, Spain

Ecole des Mines de Saint-Étienne, CNRS UMR 5307, 158 cours Fauriel, F-42023 Saint-Étienne, Cedex 2, France

Advanced Materials Multiscale Modeling, Institute of Structural Mechanics, Bauhaus-Universität Weimar, Marienstr. 15, D-99423 Weimar, Germany

Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany

NanoBioMedical Centre, Adam Mickiewicz University, ul. Umultowska 85, PL-61614 Poznan, Poland

Catalonia Institute for Energy Research (IREC), Jardíns de les Dones de Negre 1, E-08930 Sant Adrià de Besòs, Spain

Departament de Física, Universitat Autònoma de Barcelona, Bellaterra, E-08193 Barcelona, Spain

Dipartimento di Fisica, Università di Cagliari, Cittadella Universitaria, Monserrato, I-09042 Cagliari, Italy

ICREA − Institució Catalana de Recerca i Estudis Avancats, E-08010 Barcelona, Spain

Funding

Ministerio de Ciencia e Innovaci?n · European Regional Development Fund · Ministerio de Econom?a y Competitividad · Horizon 2020 Framework Programme · Generalitat de Catalunya · Alexander von Humboldt-Stiftung · FP7 Ideas: European Research Council · Fundacja na rzecz Nauki Polskiej · FP7 Energy

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