Magnesium Diboride MgB<sub>2</sub>: A Simple Compound with Important Physical Properties

Pissas, M.

doi:10.1002/9780470661406.ch5

Cited by 2 publications

(3 citation statements)

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“…Figure 6 represents a map of PL intensity plotted as a function of excitation and emission wavelengths. The broad range of permissible transitions indicates that a number of new electron states have been generated in CMMBs as compared to pristine MgB 2 that is known for exhibiting two band gaps of 2.2 meV and 7.1 meV 18 . Pristine MgB 2 didn’t exhibit any native photoluminescence supporting that the PL is attained as a consequence of exfoliation (see Supplementary information S13 for more information ).…”

Section: Characterizationmentioning

confidence: 99%

“…In this pursuit of exploring layered boron-based compounds alternative to h -BN, we investigated the possibility of exfoliating magnesium diboride (MgB 2 ): a layered compound with Mg atoms sandwiched in between 2-D boron honeycomb planes, the adjacent layers being held together by ionic bonding 18 19 20 21 ( Fig. 1a ).…”

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confidence: 99%

“…The presence of metal-boron and boron-boron bonds renders high chemical stabilities, high melting points, ultra-mechanical hardness, and high electrical and thermal conductivities to the metal borides. It is expected that nano scaling the metal borides would enable utilizing these properties to their full potential 18 22 23 24 25 26 . Moreover, the structural resemblance of MgB 2 to intercalated graphite and the presence of boron honeycomb planes make it an extremely promising candidate for potentially yielding nanostructures which can facilitate access to the quasi-planar form of boron.…”

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Aqueous dispersions of few-layer-thick chemically modified magnesium diboride nanosheets by ultrasonication assisted exfoliation

Das

Bedar

Kannan

et al. 2015

Sci Rep

105

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The discovery of graphene has led to a rising interest in seeking quasi two-dimensional allotropes of several elements and inorganic compounds. Boron, carbon’s neighbour in the periodic table, presents a curious case in its ability to be structured as graphene. Although it cannot independently constitute a honeycomb planar structure, it forms a graphenic arrangement in association with electron-donor elements. This is exemplified in magnesium diboride (MgB2): an inorganic layered compound comprising boron honeycomb planes alternated by Mg atoms. Till date, MgB2 has been primarily researched for its superconducting properties; it hasn’t been explored for the possibility of its exfoliation. Here we show that ultrasonication of MgB2 in water results in its exfoliation to yield few-layer-thick Mg-deficient hydroxyl-functionalized nanosheets. The hydroxyl groups enable an electrostatically stabilized aqueous dispersion and create a heterogeneity leading to an excitation wavelength dependent photoluminescence. These chemically modified MgB2 nanosheets exhibit an extremely small absorption coefficient of 2.9 ml mg−1 cm−1 compared to graphene and its analogs. This ability to exfoliate MgB2 to yield nanosheets with a chemically modified lattice and properties distinct from the parent material presents a fundamentally new perspective to the science of MgB2 and forms a first foundational step towards exfoliating metal borides.

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Section: Characterizationmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Aqueous dispersions of few-layer-thick chemically modified magnesium diboride nanosheets by ultrasonication assisted exfoliation

Das

Bedar

Kannan

et al. 2015

Sci Rep

105

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Simple, Green, and High‐Yield Production of Boron‐Based Nanostructures with Diverse Morphologies by Dissolution and Recrystallization of Layered Magnesium Diboride Crystals in Water

Gunda

Das

2018

ChemPhysChem

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Layered metal diborides that contain metal atoms sandwiched between boron honeycomb planes offer a rich opportunity to access graphenic forms of boron. We recently demonstrated that magnesium diboride (MgB ) could be exfoliated by ultrasonication in water to yield boron-based nanosheets. However, knowledge of the fate of metal boride crystals in aqueous phases is still in its incipient stages. This work presents our preliminary findings on the discovery that MgB crystals can undergo dissolution in water under ambient conditions to result in precursors (prenucleation clusters) that, upon aging, undergo nonclassical crystallization preferentially growing in lateral directions by two-dimensional (2D) oriented attachment. We show that this recrystallization can be utilized as an avenue to obtain a high yield (≈92 %) of boron-based nanostructures, including nanodots, nanograins, nanoflakes, and nanosheets. These nanostructures comprise boron honeycomb planes chemically modified with hydride and oxy functional groups, which results in an overall negative charge on their surfaces. This ability of MgB crystals to yield prenucleation clusters that can self-seed to form nanostructures comprising chemically modified boron honeycomb planes presents a new facet to the physicochemical interaction of MgB with water. These findings also open newer avenues to obtain boron-based nanostructures with tunable morphologies by varying the chemical milieu during recrystallization.

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Magnesium Diboride MgB₂: A Simple Compound with Important Physical Properties

Cited by 2 publications

References 196 publications

Aqueous dispersions of few-layer-thick chemically modified magnesium diboride nanosheets by ultrasonication assisted exfoliation

Aqueous dispersions of few-layer-thick chemically modified magnesium diboride nanosheets by ultrasonication assisted exfoliation

Simple, Green, and High‐Yield Production of Boron‐Based Nanostructures with Diverse Morphologies by Dissolution and Recrystallization of Layered Magnesium Diboride Crystals in Water

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Magnesium Diboride MgB2: A Simple Compound with Important Physical Properties

Cited by 2 publications

References 196 publications

Aqueous dispersions of few-layer-thick chemically modified magnesium diboride nanosheets by ultrasonication assisted exfoliation

Aqueous dispersions of few-layer-thick chemically modified magnesium diboride nanosheets by ultrasonication assisted exfoliation

Simple, Green, and High‐Yield Production of Boron‐Based Nanostructures with Diverse Morphologies by Dissolution and Recrystallization of Layered Magnesium Diboride Crystals in Water

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Magnesium Diboride MgB₂: A Simple Compound with Important Physical Properties