r-BN: A fine hyperbolic dispersion modulator for bulk metamaterials consisting of heterostructured nanohybrids of h-BN and graphene

Lee, Myeongjeong; Lee, Eunsil; Byun, Sejin; Kim, Jaegyeom; Yun, Jooyeong; So, Sunae; Lee, Hyungseok; Pee, Jae-Hwan; Shim, Wooyoung; Cho, Sung‐Pyo; Rho, Junsuk; Chung, In Jae

doi:10.1016/j.jssc.2022.122937

Cited by 3 publications

(5 citation statements)

References 34 publications

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“…The crystal structures (upper) and (112̅0)-plane views (down) of the schematic illustration of h -BN and r -BN are shown in Figure d,e, respectively. Both the a axis lattice constant and the interlayer spacing of h -BN and r -BN are 2.504 and 3.333 Å, respectively, and the sole difference between them is whether they are the ABAB··· stacking sequence or the ABCABC··· stacking sequence, as shown in Figure d,e. ,, Every subsequent basal plane in h -BN revolves 180° around the c axis in relation to the basal plane that comes before it, while each subsequent basal plane in r -BN shifts 1.45 Å along the [1100] direction. In the atomic arrangement of the (112̅0)-plane, the atomic arrangement presents a vertical distribution of h -BN and an angle of 23.5° of r -BN, as shown by the red and orange lines in Figure d,e, respectively.…”

Section: Resultsmentioning

confidence: 99%

Flow Modulation Epitaxy of Thick Boron Nitride Epilayers and Wafer-Level Exfoliation

Duo,

Yang,

Wang

et al. 2024

Crystal Growth & Design

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Uniform and continuous wafer-level sp 2 -hybridized boron nitride (sp 2 -BN) is essential for the development of other III-nitride semiconductors in alleviating lattice mismatch and constructing flexible devices. In this work, we realize wafer-level thick sp 2 -BN on 2 in. c-plane sapphire with a flow modulation epitaxy (FME) method by metal−organic chemical vapor deposition (MOCVD). It is revealed that the pulsed ammonia and triethylboron interruptions greatly improve the surface morphology and crystalline quality of sp 2 -BN, attributed to the unintentional nitridation, the decrease of C impurity concentration, and the increase of B atom surface mobility. The root-mean-square roughness of 6.5 nm sp 2 -BN is only 1.6 nm, and the full width at half-maximum of the Raman spectrum is only 31.18 cm −1 . Besides the flat morphology with uniform wrinkles, a well-ordered layered sp 2 -BN structure with a lattice spacing of 0.34 nm is also revealed. Furthermore, thick sp 2 -BN demonstrates controllable exfoliated characteristics due to a weak interfacial force. These findings highlight the comprehension of the growth behavior and exfoliated characteristics of sp 2 -BN on the sapphire substrate and provide opportunities for flexible nitride devices in mass production.

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Section: Resultsmentioning

confidence: 99%

Flow Modulation Epitaxy of Thick Boron Nitride Epilayers and Wafer-Level Exfoliation

Duo,

Yang,

Wang

et al. 2024

Crystal Growth & Design

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“…The low-loss, natural, hyperbolic PhP material is an attractive alternative, 3,16 and there are various modulation methods. 17,18 They simplify the synthesis of microstructures and support higher electromagnetic confinement and photon state densities. 3 Extensive research has been conducted in natural hyperbolic PhP materials, including hexagonal boron nitride (h-BN), 19 α-MoO 3 , 20 calcite, 21 and Ca 2 N. 11 Our study aimed to search for more natural hyperbolic PhP materials with wide hyperbolic bands.…”

Section: Introductionmentioning

confidence: 99%

“…The distinctive hyperbolic isofrequency surfaces have numerous new characteristics and applications, offering a tremendous opportunity to develop new technologies in the mid-infrared (mid-IR) for applications including enhanced and modulated sensing through vibrational spectroscopy, , enhanced radiative heat transfer, − enhanced spontaneous emission, , negative refraction, − and other optical applications. , While artificial hyperbolic metamaterials have been demonstrated, they suffer from high plasmonic losses and require complicated nanofabrication, which in turn induces size-dependent limitations on optical confinement. The low-loss, natural, hyperbolic PhP material is an attractive alternative, , and there are various modulation methods. , They simplify the synthesis of microstructures and support higher electromagnetic confinement and photon state densities . Extensive research has been conducted in natural hyperbolic PhP materials, including hexagonal boron nitride (h-BN), α-MoO 3 , calcite, and Ca 2 N .…”

Section: Introductionmentioning

confidence: 99%

Hyperbolic Phonon Polaritons and Wave Vector Direction-Dependent Dielectric Tensors in Anisotropic Crystals

Fang,

Chen,

et al. 2024

J. Phys. Chem. C

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Hyperbolic phonon polariton is important in precisely controlling photons at the nanoscale. It is a common practice to calculate the dielectric function of the phonon polariton system with the Drude−Lorenz model. We considered the impact of longitudinal optical−transverse optical splitting while applying the Drude−Lorenz model. Then, the dielectric functions became wave vector direction-dependent besides electric polarization direction-dependent. Our results show that considering longitudinal optical−transverse optical splitting can more accurately predict dielectric functions. Additionally, we discovered that, besides hexagonal BN, hexagonal AlN exhibits a wide hyperbolic frequency band range, while the other four III−V semiconductor materials (BP, AlP, GaN, GaP) display it scarcely. Furthermore, we found that the phonon frequency, lifetime, and the difference of infrared active transverse optical phonon frequencies with different wave vector directions are critical factors in determining the width of the hyperbolic frequency band range. We also found some dumbbell-shaped and butterfly-shaped isofrequency curves in h-AlN, h-GaP, and especially h-GaN. Our study provides a fresh perspective on understanding the dielectric properties of these materials and lays a theoretical foundation for further exploration and development of new hyperbolic phonon polariton materials.

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“…Yet, realizing control of heat transfer in bulk, solid materials has proved challenging in practical applications because of the limited material design freedom allowed in current fabrication methods. [12][13][14][15][16][17][18] One approach for macroscale thermal control is to elaborately tailor the spatial thermal conductivity. [19] This can be achieved for example in multilayered artificial structures, or by utilizing DOI: 10.1002/adma.202307071 phase-changing materials with temperature-dependent thermal conductivities.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Rectification in Modularly Designed Bulk Metamaterials

He,

Peng,

Le Ferrand

2023

Advanced Materials

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Thermal rectification is a phenomenon of great practical importance where heat transfer is preferential in one direction. Programmable control of heat transfer in 3D space is key to enable thermal rectification at the macroscale but is rarely realized in natural materials or in current existing devices that are constructed at the nano and microscales with high system complexity. Here, modularly designed bulk metamaterials that can break the symmetry of heat transfer from one direction to the other are created, leading to thermal rectification in convergent or divergent states by tuning the metamaterial microstructural design. These thermal metamaterials are microstructured composites made using one material composition, however, they offer sufficient microstructural design freedom to allow tunable local thermal properties for unusual macroscopic heat transfer. The strategy and performance achieved are promising for next‐generation thermal management.

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r-BN: A fine hyperbolic dispersion modulator for bulk metamaterials consisting of heterostructured nanohybrids of h-BN and graphene

Cited by 3 publications

References 34 publications

Flow Modulation Epitaxy of Thick Boron Nitride Epilayers and Wafer-Level Exfoliation

Flow Modulation Epitaxy of Thick Boron Nitride Epilayers and Wafer-Level Exfoliation

Hyperbolic Phonon Polaritons and Wave Vector Direction-Dependent Dielectric Tensors in Anisotropic Crystals

Thermal Rectification in Modularly Designed Bulk Metamaterials

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