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      Modulating the thermal conductivity in hexagonal boron nitride via controlled boron isotope concentration

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          Two-dimensional flexible nanoelectronics.

          2014/2015 represents the tenth anniversary of modern graphene research. Over this decade, graphene has proven to be attractive for thin-film transistors owing to its remarkable electronic, optical, mechanical and thermal properties. Even its major drawback--zero bandgap--has resulted in something positive: a resurgence of interest in two-dimensional semiconductors, such as dichalcogenides and buckled nanomaterials with sizeable bandgaps. With the discovery of hexagonal boron nitride as an ideal dielectric, the materials are now in place to advance integrated flexible nanoelectronics, which uniquely take advantage of the unmatched portfolio of properties of two-dimensional crystals, beyond the capability of conventional thin films for ubiquitous flexible systems.
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            Thermal Conductivity of Silicon and Germanium from 3°K to the Melting Point

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              Pulse accumulation, radial heat conduction, and anisotropic thermal conductivity in pump-probe transient thermoreflectance.

              The relationship between pulse accumulation and radial heat conduction in pump-probe transient thermoreflectance (TTR) is explored. The results illustrate how pulse accumulation allows TTR to probe two thermal length scales simultaneously. In addition, the conditions under which radial transport effects are important are described. An analytical solution for anisotropic heat flow in layered structures is given, and a method for measuring both cross-plane and in-plane thermal conductivities of thermally anisotropic thin films is described. As verification, the technique is used to extract the cross-plane and in-plane thermal conductivities of highly ordered pyrolytic graphite. Results are found to be in good agreement with literature values.
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                Author and article information

                Journal
                Communications Physics
                Commun Phys
                Springer Science and Business Media LLC
                2399-3650
                December 2019
                May 2 2019
                December 2019
                : 2
                : 1
                Article
                10.1038/s42005-019-0145-5
                78363b3b-dab3-47a7-85bc-f1a513668cfb
                © 2019

                https://creativecommons.org/licenses/by/4.0

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