Thermal conductivity of ultra-thin chemical vapor deposited hexagonal boron nitride films

Alam, M.; Bresnehan, Michael S.; Robinson, Joshua A.; Haque, M. Shamsul

doi:10.1063/1.4861468

Cited by 53 publications

(32 citation statements)

References 23 publications

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“…Therefore, it is of great importance to improve the synthesis of BN nanosheets [4] Young's modulus 1.0 TPa [9,10] 0.71-0.97 TPa (theoretical) [5][6][7][8] Breaking strength 130 GPa [9,10] 120-165 GPa (theoretical) [5][6][7][8] Thermal conductivity 1800-5400 W m -1 K -1 [95,96] 100-270 W m -1 K -1 (few-layer) [11][12][13] Oxygen doping 250 °C [17] >700 °C [22] EtcEtching by oxidation 450 °C [17] >800 °C [22] Galvanic corrosion Yes [31,32] No [33] Protection barrier No [31,32] Yes [33] Reusable surfaceenhanced Raman spectroscopy substrate Many unique and exciting properties have been theoretically predicted for 1L BN and await experimental verifi cation, so they can act as guidance for future research in the fi eld.…”

Section: Discussionmentioning

confidence: 99%

Atomically Thin Boron Nitride: Unique Properties and Applications

Chen

2016

Adv Funct Materials

439

282

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Atomically thin boron nitride (BN) is an important two-dimensional (2D) nanomaterial, with many properties distinct from graphene. In this feature article, these unique properties and associated applications often not possible from graphene are outlined. The article starts with characterization and identification of atomically thin BN. It is followed by demonstrating their strong oxidation resistance at high temperatures and applications in protecting metals from oxidation and corrosion. As flat insulators, BN nanosheets are ideal dielectric substrates for surface enhanced Raman spectroscopy (SERS) and electronic devices based on 2D heterostructures. The light emission of BN nanosheets in the deep ultraviolet (DUV) and ultraviolet (UV) regions are also included for its scientific and technological importance. The last part is dedicated to synthesis, characterization, and optical properties of BN nanoribbons, a special form of nanosheets

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Section: Discussionmentioning

confidence: 99%

Atomically Thin Boron Nitride: Unique Properties and Applications

Chen

2016

Adv Funct Materials

439

282

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“…The more recent interest in hBN has been motivated by the search for an electrically insulating counterpart of graphene suitable for thermal management applications [5,6]. Apart from excellent dielectric properties, few atomic layer hBN crystals demonstrated high values of thermal conductivity approaching that of the bulk value [7][8][9]. Considering the rare combination of the electrical insulating behaviour with exceptionally high thermal conductivity, hexagonal boron nitride is a promising candidate for the next-generation of thermal management material.…”

Section: Introductionmentioning

confidence: 99%

High thermal conductivity of hexagonal boron nitride laminates

et al. 2016

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Abstract. Two-dimensional materials are characterised by a number of unique physical properties which can potentially make them useful to a wide diversity of applications. In particular, the large thermal conductivity of graphene and hexagonal boron nitride has already been acknowledged and these materials have been suggested as novel core materials for thermal management in electronics. However, it was not clear if mass produced flakes of hexagonal boron nitride would allow one to achieve an industrially-relevant value of thermal conductivity. Here we demonstrate that laminates of hexagonal boron nitride exhibit thermal conductivity of up to 20 W/mK, which is significantly larger than that currently used in thermal management. We also show that the thermal conductivity of laminates increases with the increasing volumetric mass density, which creates a way of fine tuning its thermal properties.

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“…is the ambient temperature. For small temperature difference, h can be expressed as [43]: Grain size-induced thermo-mechanical coupling in zirconium thin films 1199…”

Section: Methodsmentioning

confidence: 99%

Grain size-induced thermo-mechanical coupling in zirconium thin films

Wang

Pulavarthy

Haque

2015

J Therm Anal Calorim

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At the bulk scale, thermal conductivity of metals is not coupled with mechanical strain. However, this may not be the same for grain sizes below the electron mean free path, for which mechanical deformation mechanism and volume fraction of grain boundaries are drastically different from the bulk. To investigate this hypothesis of grain size-induced thermo-mechanical coupling, we developed an experimental setup to measure the thermal conductivity of 100-nm-thick freestanding nanocrystalline zirconium (Zr) films as a function of externally applied mechanical strain. Experimental results show strong mechanical strain-thermal conductivity coupling, thermal conductivity of Zr film dropped from 20 to 13 W m -1 K -1 with an increasing strain from 0 to 1.24 %. Thermal conductivity of Zr film was also measured as a function of average grain size ranging from as-deposited 10 nm to asgrown 250 nm. The results clearly show that for grain sizes above 10 nm, mechanical strain has no influence over thermal conductivity, which supports the proposed hypothesis.

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Thermal conductivity of ultra-thin chemical vapor deposited hexagonal boron nitride films

Cited by 53 publications

References 23 publications

Atomically Thin Boron Nitride: Unique Properties and Applications

Atomically Thin Boron Nitride: Unique Properties and Applications

High thermal conductivity of hexagonal boron nitride laminates

Grain size-induced thermo-mechanical coupling in zirconium thin films

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