Mechanochemistry of hexagonal boron nitride. 2. Reactivity upon interaction with water

Стрелецкий, А. Н.; Permenov, D. G.; Bokhonov, Boris B.; Леонов, А. В.; Mudretsova, S. N.

doi:10.1134/s1061933x10040174

Cited by 9 publications

(11 citation statements)

References 6 publications

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“…This claim is 5/11 supported by the TEM inspection of the irradiated areas in Fig. 2 and literature studying the reactivity of mechanically damaged bulk hBN in water 44 . This defect formation process specific of hBN flakes deposited on substrates with thicknesses much larger than the typical beam penetration depth (< 100 nm) 19 , due to the unique FIB-substrate interaction effects, illustrated in Fig.…”

Section: Resultssupporting

confidence: 61%

Engineering optically active defects in hexagonal boron nitride using focused ion beam and water

Glushkov¹,

Macha²,

Esther³

et al. 2021

Preprint

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Hexagonal boron nitride (hBN) has emerged as a promising material platform for nanophotonics and quantum sensing, hosting optically-active defects with exceptional properties such as high brightness and large spectral tuning. However, precise control over deterministic spatial positioning of emitters in hBN remained elusive for a long time, limiting their proper correlative characterization and applications in hybrid devices. Recently, focused ion beam (FIB) systems proved to be useful to engineer several types of spatially-defined emitters with various structural and photophysical properties. Here we systematically explore the physical processes leading to the creation of optically-active defects in hBN using FIB, and find that beam-substrate interaction plays a key role in the formation of defects. These findings are confirmed using transmission electron microscopy that reveals local mechanical deterioration of the hBN layers and local amorphization of ion beam irradiated hBN. Additionally, we show that upon exposure to water, amorphized hBN undergoes a structural and optical transition between two defect types with distinctive emission properties. Moreover, using super-resolution optical microscopy combined with atomic force microscopy, we pinpoint the exact location of emitters within the defect sites, confirming the role of defected edges as primary sources of fluorescent emission. This lays the foundation for FIB-assisted engineering of optically-active defects in hBN with high spatial and spectral control for applications ranging from integrated photonics, to quantum sensing to nanofluidics.

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Section: Resultssupporting

confidence: 61%

Engineering optically active defects in hexagonal boron nitride using focused ion beam and water

Glushkov¹,

Macha²,

Esther³

et al. 2021

Preprint

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show abstract

“…Similarly, at sufficiently high temperatures, BN particles with exposed defect sites react with oxygen to form boric acid and ammonia . After boric acid removal, further high-energy surfaces are exposed for reaction.…”

Section: Resultsmentioning

confidence: 99%

Scalable Purification of Boron Nitride Nanotubes via Wet Thermal Etching

Marincel

Adnan

et al. 2019

Chem. Mater.

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Boron nitride nanotubes (BNNT) are poised to fill an electrically insulating, high-temperature, highstrength niche. Despite significant progress over the past two decades, BNNTs are not yet synthesized in high enough quantity and quality to permit their use in engineering applications. The next necessary step to make BNNTs accessible for research and applications is to improve the availability of high-quality BNNTs. Here, we present a scalable bulk purification technique that yields high-purity BNNTs. Bulk synthesized material is introduced to a wet oxygen environment at elevated temperatures to remove elemental boron and hexagonal boron nitride impurities with a final yield of purified BNNTs near 10 wt %. This process shows full removal of impurities, as observed by scanning electron microscopy (SEM), cryogenic transmission electron microscopy (TEM), and high-resolution TEM. X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy show minimal BNNT functionalization, while high-resolution TEM shows damage to large-diameter BNNTs.

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“…[122][123][124] Traditional ball-milling methods are quite aggressive and non-selective, yielding h-BN products with a significant number of defects. 53,[125][126][127] Li et al reported a mild wet ball-milling process that yields few-layered crystalline BNNSs with slight lateral size reduction (Fig. 7a).…”

Section: Top-down Methodsmentioning

confidence: 99%

Advances in 2D boron nitride nanostructures: nanosheets, nanoribbons, nanomeshes, and hybrids with graphene

Lin

Connell²

2012

Nanoscale

801

588

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The recent surge in graphene research has stimulated interest in the investigation of various 2-dimensional (2D) nanomaterials. Among these materials, the 2D boron nitride (BN) nanostructures are in a unique position. This is because they are the isoelectric analogs to graphene structures and share very similar structural characteristics and many physical properties except for the large band gap. The main forms of the 2D BN nanostructures include nanosheets (BNNSs), nanoribbons (BNNRs), and nanomeshes (BNNMs). BNNRs are essentially BNNSs with narrow widths in which the edge effects become significant; BNNMs are also variations of BNNSs, which are supported on certain metal substrates where strong interactions and the lattice mismatch between the substrate and the nanosheet result in periodic shallow regions on the nanosheet surface. Recently, the hybrids of 2D BN nanostructures with graphene, in the form of either in-plane hybrids or inter-plane heterolayers, have also drawn much attention. In particular, the BNNS-graphene heterolayer architectures are finding important electronic applications as BNNSs may serve as excellent dielectric substrates or separation layers for graphene electronic devices. In this article, we first discuss the structural basics, spectroscopic signatures, and physical properties of the 2D BN nanostructures. Then, various top-down and bottom-up preparation methodologies are reviewed in detail. Several sections are dedicated to the preparation of BNNRs, BNNMs, and BNNS-graphene hybrids, respectively. Following some more discussions on the applications of these unique materials, the article is concluded with a summary and perspectives of this exciting new field.

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Mechanochemistry of hexagonal boron nitride. 2. Reactivity upon interaction with water

Cited by 9 publications

References 6 publications

Engineering optically active defects in hexagonal boron nitride using focused ion beam and water

Engineering optically active defects in hexagonal boron nitride using focused ion beam and water

Scalable Purification of Boron Nitride Nanotubes via Wet Thermal Etching

Advances in 2D boron nitride nanostructures: nanosheets, nanoribbons, nanomeshes, and hybrids with graphene

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