Single crystal growth of monoisotopic hexagonal boron nitride from a Fe–Cr flux

Li, Jiahan; Elias, Christine; Ye, Gaihua; Evans, Dylan; Liu, Song; He, Rui; Cassabois, Guillaume; Gil, Bernard; Valvin, Pierre; Liu, Bin; Edgar, James H.

doi:10.1039/d0tc02143a

Cited by 24 publications

(14 citation statements)

References 30 publications

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“…a massive hydraulic press) is required, which strongly limits any upscaling or industrial production. It is worth noticing that more recently, samples demonstrating almost similar quality were achieved by an atmospheric pressure HT (AP/HT) method [12][13][14][15]. This process requires a very slow cooling at HT (a few days long) limiting once more its upscaling.…”

Section: Introductionmentioning

confidence: 99%

From the synthesis of hBN crystals to their use as nanosheets in van der Waals heterostructures

Maestre

Garnier

et al. 2022

2D Mater.

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In the wide world of 2D materials, hexagonal boron nitride (hBN) holds a special place due to its excellent characteristics. In addition to its thermal, chemical and mechanical stability, hBN demonstrates high thermal conductivity, low compressibility, and wide band gap around 6 eV, making it a promising candidate for many groundbreaking applications and more specifically in van der Waals heterostructures. Millimeters scale hexagonal boron nitride crystals are obtained through a disruptive dual method (PDC/PCS) consisting in a complementary coupling of the Polymer Derived Ceramics route and a Pressure-Controlled Sintering process. In addition to their excellent chemical and crystalline quality, these crystals exhibit a free exciton lifetime of 0.43 ns, as determined by time-resolved cathodoluminescence measurements, confirming their interesting optical properties. To go further in applicative fields, hBN crystals are then exfoliated, and resulting Boron Nitride NanoSheets (BNNSs) are used to encapsulate transition metal dichalcogenides (TMDs). Such van der Waals heterostructures are tested by optical spectroscopy. BNNSs do not luminesce in the emission spectral range of TMDs and the photoluminescence width of the exciton at 4K is in the range 2-3 meV. All these results demonstrate that these BNNSs are of high quality and relevant for future opto-electronic applications.

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Section: Introductionmentioning

confidence: 99%

From the synthesis of hBN crystals to their use as nanosheets in van der Waals heterostructures

Maestre

Garnier

et al. 2022

2D Mater.

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“…-Page 11 of 39 -Methods Sample Growth: hBN crystals were grown at atmospheric pressure from a molten iron-chromium solution using a 10 B isotopically enriched boron source 42 . Flakes were then chemically exfoliated and transferred onto lacey carbon TEM grids, where the flakes were only supported by the thin carbon web.…”

Section: Discussionmentioning

confidence: 99%

“…Sample Growth: hBN crystals were grown at atmospheric pressure from a molten iron-chromium solution using a 10 B isotopically enriched boron source. [53] Flakes were then chemically exfoliated and transferred onto lacey carbon TEM grids, where the flakes were only supported by the thin carbon web. The sizes of the flakes varied from tens of micrometers to tens of nanometers in diameter and a few layers to a few hundred nanometers in thickness.…”

Section: Methodsmentioning

confidence: 99%

Revealing Nanoscale Confinement Effects on Hyperbolic Phonon Polaritons with an Electron Beam

Konečná

Edgar

et al. 2021

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Hyperbolic phonon polaritons (HPhPs) in hexagonal boron nitride (hBN) enable the direct manipulation of mid‐infrared light at nanometer scales, many orders of magnitude below the free‐space light wavelength. High‐resolution monochromated electron energy‐loss spectroscopy (EELS) facilitates measurement of excitations with energies extending into the mid‐infrared while maintaining nanoscale spatial resolution, making it ideal for detecting HPhPs. The electron beam is a precise source and probe of HPhPs, which allows the observation of nanoscale confinement in HPhP structures and directly extract hBN polariton dispersions for both modes in the bulk of the flake and modes along the edge. The measurements reveal technologically important nontrivial phenomena, such as localized polaritons induced by environmental heterogeneity, enhanced and suppressed excitation due to 2D interference, and strong modification of high‐momenta excitations such as edge‐confined polaritons by nanoscale heterogeneity on edge boundaries. The work opens exciting prospects for the design of real‐world optical mid‐infrared devices based on hyperbolic polaritons.

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“…The hexagonal boron nitride crystal flakes were grown at atmospheric pressure using an ironchromium solvent, isotopically-enriched boron-10 (>99% 10 B) and nitrogen. The crystal growth process was previously described in detail 57 .…”

Section: Hbnmentioning

confidence: 99%

Reconfigurable Hyperbolic Polaritonics with Correlated Oxide Metasurfaces

Aghamiri¹,

Fali³

et al. 2021

Preprint

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Polaritons enable subwavelength confinement and highly anisotropic flows of light over a wide spectral range, holding the promise for applications in modern nanophotonic and optoelectronic devices. However, to fully realize their practical application potential, facile methods enabling nanoscale active control of polaritons are needed. Here, we introduce a hybrid polaritonic-oxide heterostructure platform consisting of van der Waals crystals, such as hexagonal boron nitride (hBN) or alpha-phase molybdenum trioxide (α-MoO3), transferred on nanoscale oxygen vacancy patterns on the surface of prototypical correlated perovskite oxide SmNiO3 (SNO). Using a combination of scanning probe microscopy and infrared nanoimaging techniques, we demonstrate nanoscale real-time reconfigurability of complex hyperbolic phonon polaritons patterned at the nanoscale with unmatched resolution. Hydrogenation and temperature modulation allow spatially localized conductivity modulation of SNO nanoscale patterns, enabling robust real-time modulation and nanoscale reconfiguration of hyperbolic polaritons. Our work paves the way towards nanoscale programmable metasurface engineering as a new paradigm for reconfigurable nanophotonic applications facilitated by a hybrid material platform exploiting extreme light-matter interactions in polaritonic systems.

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Single crystal growth of monoisotopic hexagonal boron nitride from a Fe–Cr flux

Abstract:
High-quality monoisotopic hBN were synthesized using Fe-Cr flux. Boron and nitrogen were dissolved at a high temperature, then hBN single crystals were precipitated during cooling process.

Cited by 24 publications

References 30 publications

From the synthesis of hBN crystals to their use as nanosheets in van der Waals heterostructures

From the synthesis of hBN crystals to their use as nanosheets in van der Waals heterostructures

Revealing Nanoscale Confinement Effects on Hyperbolic Phonon Polaritons with an Electron Beam

Reconfigurable Hyperbolic Polaritonics with Correlated Oxide Metasurfaces

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Single crystal growth of monoisotopic hexagonal boron nitride from a Fe–Cr flux

Abstract: High-quality monoisotopic hBN were synthesized using Fe-Cr flux. Boron and nitrogen were dissolved at a high temperature, then hBN single crystals were precipitated during cooling process.

Cited by 24 publications

References 30 publications

From the synthesis of hBN crystals to their use as nanosheets in van der Waals heterostructures

From the synthesis of hBN crystals to their use as nanosheets in van der Waals heterostructures

Revealing Nanoscale Confinement Effects on Hyperbolic Phonon Polaritons with an Electron Beam

Reconfigurable Hyperbolic Polaritonics with Correlated Oxide Metasurfaces

Contact Info

Product

Resources

About

Abstract:
High-quality monoisotopic hBN were synthesized using Fe-Cr flux. Boron and nitrogen were dissolved at a high temperature, then hBN single crystals were precipitated during cooling process.