Spectroscopic study of partially oxidized BN nanoscrolls induced by low frequency ultrasonic irradiation

Miranti, Rany; Qayyum, Muhammad Saqib; Sharma, Anuvansh; Einarsrud, Mari‐Ann; Mestres, N.; Benelmekki, Maria

doi:10.1016/j.apsusc.2020.146055

Cited by 8 publications

(9 citation statements)

References 32 publications

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“…More recently, a two-step method for the simultaneous formation and functionalization of hBN NSHs and NSCs was presented [ 66 ]. The first step consisted of a conventional chemical exfoliation under alkaline conditions [ 51 ], and the second step was the exposure of the obtained NSHs to low-frequency ultrasonic irradiation.…”

Section: Methods Of Synthesis Of Nshsmentioning

confidence: 99%

“…In addition, the hBN NSHs undergo a phase transition from sp 2 bonding to a mixture of sp 2 and sp 3 bonding under ultrasonic irradiation. This phase transition was attributed to the asymmetric vibrations and bending deformations of hBN NSHs upon scrolling to form NSCs [ 66 ].…”

Section: Methods Of Synthesis Of Nshsmentioning

confidence: 99%

“…Nanosheets were observed to curl up and form NSCs under sonication, e.g., the case of graphene and hBN [ 62 , 66 ]. While NSHs are exposed to ultrasonic irradiation, the ultrasonic energy imparted to the surrounding medium leads to the activation energy of the NSHs to form NSCs.…”

Section: Mechanisms Behind the Scrolling And Unscrolling Of Nshsmentioning

confidence: 99%

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Stimulus-Responsive Ultrathin Films for Bioapplications: A Concise Review

Benelmekki

Kim

2023

Molecules

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The term “nanosheets” has been coined recently to describe supported and free-standing “ultrathin film” materials, with thicknesses ranging from a single atomic layer to a few tens of nanometers. Owing to their physicochemical properties and their large surface area with abundant accessible active sites, nanosheets (NSHs) of inorganic materials such as Au, amorphous carbon, graphene, and boron nitride (BN) are considered ideal building blocks or scaffolds for a wide range of applications encompassing electronic and optical devices, membranes, drug delivery systems, and multimodal contrast agents, among others. A wide variety of synthetic methods are employed for the manufacturing of these NSHs, and they can be categorized into (1) top-down approaches involving exfoliation of layered materials, or (2) bottom-up approaches where crystal growth of nanocomposites takes place in a liquid or gas phase. Of note, polymer template liquid exfoliation (PTLE) methods are the most suitable as they lead to the fabrication of high-performance and stable hybrid NSHs and NSH composites with the appropriate quality, solubility, and properties. Moreover, PTLE methods allow for the production of stimulus-responsive NSHs, whose response is commonly driven by a favorable growth in the appropriate polymer chains onto one side of the NSHs, resulting in the ability of the NSHs to roll up to form nanoscrolls (NSCs), i.e., open tubular structures with tunable interlayer gaps between their walls. On the other hand, this review gives insight into the potential of the stimulus-responsive nanostructures for biosensing and controlled drug release systems, illustrating the last advances in the PTLE methods of synthesis of these nanostructures and their applications.

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Section: Methods Of Synthesis Of Nshsmentioning

confidence: 99%

Section: Methods Of Synthesis Of Nshsmentioning

confidence: 99%

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Stimulus-Responsive Ultrathin Films for Bioapplications: A Concise Review

Benelmekki

Kim

2023

Molecules

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“…At present, there are two different ways of fabricating BN nanoparticles (BNNPs), namely, top-down and bottom-up approaches . The top-down procedures involve physical exfoliation or chemical modification of large-sized bulk h -BN crystals for obtaining small-sized nanoparticles . Among these techniques are liquid exfoliation, solvothermal/hydrothermal treatment, and ionic intercalation.…”

Section: Introductionmentioning

confidence: 99%

“…29 The top-down procedures involve physical exfoliation 32 or chemical modification of large-sized bulk h-BN crystals for obtaining small-sized nanoparticles. 33 Among these techniques are liquid exfoliation, solvothermal/hydrothermal treatment, and ionic intercalation. Significant disadvantages of the top-down method are time consumption, low yield of nanoparticles, and significant size variation.…”

Section: Introductionmentioning

confidence: 99%

Photocontrol of Single-Photon Generation in Boron Nitride Nanoparticles: Implications for Quantum Photon Sources, Sub-Diffraction Nanoscopy, and Bioimaging

Gritsienko

Matveev

Kurochkin

et al. 2022

ACS Appl. Nano Mater.

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Hexagonal boron nitride (h-BN) is a promising material for nanophotonics. Intrinsic and artificially induced defects in h-BN films, flakes, and nanoparticles are potential candidates as quantum emitters at room temperature. However, the energy structure and the methods for controlling these defects are still unclear. In this paper, we have obtained single-photon sources in ultrafine h-BN nanoparticles fabricated by a cost-effective ammonothermal dehydration. We demonstrate quantum-dot-like emission using photon autocorrelation and fluorescence intensity trace measurements in the red range. The results obtained using low-power near-ultraviolet coexcitation reveal the distinctive photophysical properties of fluorescent defects in the synthesized h-BN nanoparticles. We show that quantum emitters in nanoparticles can be switched from dark to bright mode by coexcitation photocontrol. The observed effects in nanoparticles were explained by various mechanisms of metastable state disabling. We also report a 2-fold improvement in the contrast of fluorescence images from h-BN nanoparticles under low-intensity laser scanning coexcitation. The research results can be used to develop efficient solid-state photon sources, as well as in nanoscopy employing biocompatible fluorescent nanoparticles.

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