Environmentally friendly, scalable exfoliation for few-layered hexagonal boron nitride nanosheets (BNNSs) by multi-time thermal expansion based on released gases
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A novel approach to exfoliate BNNSs on a large scale Keywords:
Exfoliation joint
Environmentally Friendly
Hexagonal boron nitride
Hexagonal boron nitride (h-BN), graphite analogous structure, has many interesting applications due to its excellent thermal, electrical and mechanical properties. In this study, different routes of liquid exfoliation using solvent and ultrasound were used to obtain two-dimensional (2D) nanosheets of h-BN. The efficiency of the exfoliative routes was evaluated by Transmission electron microscopy (TEM) and UV-Vis spectroscopy. Results demonstrated that the technique was effective in the exfoliation of h-BN bulk and that the solvent's choice, considering an optimum surface tension of the solvent-solute system, and the rotation of the centrifugation in the selection of the exfoliated nanosheets, are crucial for the performance of the technique. The most promising exfoliation route has been found to be the dispersion of h-BN in solvent mixture (20% IPA in water) for 3 h on ultrasound, followed by centrifugation at 1500 or 3000 rpm.
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Direct and scalable electrochemical exfoliation of nonconductive boron nitride (h -BN) nanosheets by bipolar electrochemistry method.
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Boron nitride nanosheets (BNNSs) have been widely used in many fields due to their excellent properties. However, low preparation rates and difficulty in functionalization hinder their further development. This study proposes a novel glucose-assisted ultrasonic cavitation exfoliation (GAUCE) method with glucose as an auxiliary solution to prepare BNNSs. Results show that the method has a high preparation yield of 55.58%, which is higher than the average preparation yield of 33.86%. The mechanism of preparing BNNSs by GAUCE was also investigated. The exfoliation of BNNSs was achieved using the energy of ultrasonic cavitation bubble collapse, which will break the interlayer forces in h-BN. The grafting of hydroxyl groups decomposed by glucose on the edge and surface of BNNSs during cavitation prevented the re-aggregation of the nanosheets, thereby increasing the exfoliation yield of BNNSs. In addition, the contact angle of BNNSs prepared by GAUCE was reduced, and the hydrophilicity was greatly improved.
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Boron Nitride - a wide bandgap insulating material can be suitably tuned to produce boron nitride nanosheets (BNNS) with strengthened properties. Bulk material upon exfoliation and surface treatment could make structural improvements leads to the change in electrical and optical properties. The present work is focused to produce BNNS followed by chemical treatment of its surface in order to tune its optical properties. Herein BNNS is produced through solvent assisted exfoliation and property tuning via fluorination. The prepared samples were subjected to FTIR, Raman, XRD and UV studies.
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Herein, a scalable and controllable approach is proposed to exfoliate high quality hexagonal boron nitride nanosheets (h-BNNSs) from h-BN flakes, which relies on the efficient reduction of h-BNNS interlayer interaction by rapid volume expansion of water in icing. Water can enter into the h-BNNS interlayer through the “entry” caused by the hydroxyl induced local structure distortion as demonstrated by molecular dynamics simulations. The entered water could form fairly compact initial nuclei, and then ice and rapidly expand as temperature drops sharply, resulting in the interlayer space increase and interlayer force reduction between h-BNNSs and thus achieving efficient exfoliation of h-BNNSs in subsequent ultrasonication. The thicknesses of h-BNNSs are dominated by freezing and exfoliation cycles, and monolayer h-BNNSs can be obtained after five cycles of freezing and exfoliation currently. The as-obtained h-BNNSs have excellent dispersibility in water enabling their versatile applications as polymer additives, thermal conductive fillers, and flame-retardants, etc.
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A novel, simple, and efficient method for the preparation of the fluorinated hexagonal boron nitride nanosheets (F-BNNSs) and the corresponding magnetic properties is presented. A one-step route is used to exfoliate and fluorinate the BNNSs by ammonium fluoride (NH4F) from hexagonal boron nitride (h-BN) powder. Through related instrument characterizations and theoretical calculations, we confirm that large-area and few-layer F-BNNSs were successfully produced by this method, which can be attributed to a fluorination-assisted exfoliation mechanism from the bulk h-BN in NH4F. More intriguingly, we initially verified that the as-prepared F-BNNSs exhibit ferromagnetic characteristics, which would have good potential applications in spintronic devices.
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Owning many peculiar properties, hexagonal boron nitride nanosheets (BNNSs) have lots of potential applications, such as electronic devices and deep ultraviolet emitters. In this article, a chemical exfoliation method to prepare few-layer and large size BNNSs is reported. Through related instrument characterizations, we demonstrated that this preparation method can allow the exfoliation of BNNSs from bulk BN powder successfully. From CL spectra, the as-prepared BNNSs were proved to show stronger CL emission ability than BN powder. Based on the experiment results analysis, we proposed an exfoliation mechanism and verified it through in situ SEM detection.
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The miniaturisation of electronic components requires high-performance materials with insulating and thermal conductive properties for electronic packaging and thermal management. Boron nitride nanosheets (BNNS) are a desirable thermal conductive filler due to their excellent thermal stability, chemical stability, and high thermoconductivity. However, it remains challenging to mass produce ultra-thin large-scale BNNS and combine them with small amounts of polymers to fabricate malleable thermoconductive composites for flexible electronic devices. Herein, we report a new method to prepare BNNS at high yield by high-temperature oxidation treatment followed by hydrothermal exfoliation in NaOH-LiCl solution. We further fabricated flexible, insulating, and highly thermoconductive BNNS/PI ( polyimide ) nanocomposite paper, via a scalable layer-by-layer process that involves electrospinning of PI fibres and eletrospraying of BNNS. The prepared BNNS have a transverse size of 1.18 µm and a thickness of 1–2.9 nm, with a high yield of 75.48% at a concentration of 3.38 mg/mL. The BNNS/PI nanocomposite paper exhibited an ultrahigh in-plane thermal conductivity (7.58 W m -1 K -1 ), 2005% higher than that of the pure PI nanofibre composite. This simple method has wide application potential in next-generation electronic devices to design thermal interface materials with excellent electrical insulation, thermostability, and flexibility.
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Abstract A novel, simple, and efficient method for the preparation of the fluorinated hexagonal boron nitride nanosheets (F‐BNNSs) and the corresponding magnetic properties is presented. A one‐step route is used to exfoliate and fluorinate the BNNSs by ammonium fluoride (NH 4 F) from hexagonal boron nitride (h‐BN) powder. Through related instrument characterizations and theoretical calculations, we confirm that large‐area and few‐layer F‐BNNSs were successfully produced by this method, which can be attributed to a fluorination‐assisted exfoliation mechanism from the bulk h‐BN in NH 4 F. More intriguingly, we initially verified that the as‐prepared F‐BNNSs exhibit ferromagnetic characteristics, which would have good potential applications in spintronic devices.
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Hexagonal boron nitride
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