boron nitride thermal conductivity

The electronic, optical and vibrational properties of boron nitride structures are widely studied, while the thermoelectric properties have not been thoroughly investigated. The higher the value of figure of merit (ZT), the greater is the production of electricity. Thermal transport properties of boron nitride based materials: A review. Copyright © 2020 Elsevier B.V. or its licensors or contributors. In this review, the different synthesis approaches adopted for BNNS are compared and the effects of BNNS dispersion on the thermal conduction of polymers are discussed. Therefore, there is a need of environment friendly, reusable and low cost thermoelectric materials. In the recent years, advances in the synthesis of boron nitride based structures which are analogous to carbon, have attracted significant interest by the researchers. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Theoretical studies have revealed that two dimensional (2D) BN has higher thermal conductivity (up to 400 Wm −1 K −1, in-plane) than bulk h-BN due to a reduction in phonon-phonon scattering when scaling down the thickness of the material. Key Boron Nitride Properties: High thermal conductivity: Low thermal expansion: Good thermal shock resistance: High electrical resistance: Low dielectric constant and loss tangent: Microwave transparency: Non toxic: Easily machined — non abrasive and lubricious: Chemically inert: Not wet by most molten metals: Typical Boron Nitride Uses The κ l of composite increases from 1.63 W/mK to 3.06 W/mK with BNNS loading of 25.1 vol% as shown in Fig. https://doi.org/10.1016/j.rser.2019.109622. This evolution in boron nitride based materials will elucidate their potential for developing high-performance next-generation thermoelectric devices. By continuing you agree to the use of cookies. By continuing you agree to the use of cookies. High thermal conductivity, structural stability, good mechanical and anti-oxidant properties makes hexagonal boron nitride (h-BN) a promising functional filler for polymers to produce composite materials where excellent thermal management is required, such as in electronic devices. Various methods have been explored to produce 2D BNNS including mechanical and chemical exfoliation of pristine bulk BN, chemical reaction, chemical vapour deposition (CVD) and electron irradiation. 19 (a) . Due to the interconnection between thermoelectric parameters it is difficult to achieve ZT up to 2 or 3. The era of thermoelectric materials has begun in the search of clean, green and renewable anticipated energy resources. Thermal conductivity of bulk BN is very high resulting into smaller value of ZT. Current advances in thermal transport on BN structures are explained. Thermal conductivity of 2D nano-structured boron nitride (BN) and its composites with polymers. Copyright © 2020 Elsevier B.V. or its licensors or contributors. Some perspectives and future directions on how to generate high thermally conductive composites of BNNS and polymer are proposed. However, over the past years, a significant effort has been directed towards the enhancement of their thermoelectric properties. For this reason, 2D boron nitride nanosheets (BNNS) are gaining intense interest since they could be utilised in the design of composite materials with excellent efficiency to dissipate heat. We use cookies to help provide and enhance our service and tailor content and ads. ZT can be enhanced by making composition of BN nanostructures with graphene. © 2018 Elsevier Ltd. All rights reserved. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Thermoelectric materials are attracting a lot of spotlights by directly converting waste heat in electricity and could be a valuable part in world's energy emergence. © 2019 Elsevier Ltd. All rights reserved. We use cookies to help provide and enhance our service and tailor content and ads. Commercially existing Pb–Te and Bi–Te based thermoelectric materials provide good thermoelectric efficiency but are toxic, denser and of high cost. Theoretical studies have revealed that two dimensional (2D) BN has higher thermal conductivity (up to 400 Wm−1 K−1, in-plane) than bulk h-BN due to a reduction in phonon-phonon scattering when scaling down the thickness of the material. To facilitate the dispersion of BNNS in polymers, different functionalization strategies have been applied for surface-treatment of BNNS. An extensive review of the thermoelectric characteristics of bulk phases of BN (like a-BN, c-BN, and w-BN), hexagonal-BN (h-BN), boron nitride nanotube (BNNT), boron nitride nanoribbon (ABNNR and ZBNNR), boron nitride quantum dots and boron nitride composites is presented. https://doi.org/10.1016/j.pmatsci.2018.10.002. Boron nitride nanosheets being highly thermal conductive were used as fillers with silver nanoparticle deposition to increase the thermal conductivity of polymer . Hexagonal boron nitride can be exfoliated to mono or few atomic layer sheets. Different technologies were adopted by researchers in developing the thermoelectric efficiency. Due to its analogous structure to that of graphene, atomically thin boron nitride is sometimes called “white graphene”. Present review provides an insight into the emerging boron nitride (BN) structures on the basis of their thermoelectric properties. Increase in phonon scattering region lowers thermal conductance and improves ZT. The factors influencing the mechanism of thermal conduction such as materials crystallinity, filler geometry, filler surface functionalization and alignment, filler/matrix interface and processing conditions are discussed.

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