One‐Step Exfoliation and Fluorination of Boron Nitride Nanosheets and a Study of Their Magnetic Properties
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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.Keywords:
Exfoliation joint
Hexagonal boron nitride
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Nanosheet
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Thermal Stability
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Sulfate modified BNNS based gas sensors exhibit superior sensing performances, offering a powerful platform for NO2 sensing and/or capturing applications.
Hexagonal boron nitride
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Chemical sensor
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It is difficult for traditional cooling liquids to meet equipment requirements due to the high power and high integration they demand. Nanofluids are nanoparticle dispersions with high thermal conductivities, thus they have been proposed for heat transfer applications. Boron nitride nanosheets (BNNSs) possess high thermal conductivities and excellent insulation properties. Here, we fabricated BNNS nanofluids and investigated their effects on thermal conductivity enhancements. We find that BNNSs can effectively enhance the thermal conductivity of water. The thermal conductivity of the BNNS nanofluids reached 2.39 W mK-1 at 24 vol% loading. The surface temperature changes of the nanofluids and water were observed during the heating process using an infrared camera. The results show that the nanofluids transfer heat much faster than water, indicating that the fabricated BNNS nanofluids have excellent thermal transfer properties.
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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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Surface Modification
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This paper aims to investigate the vibrational properties of single-layered boron nitride nanosheet/single-walled boron nitride nanotube junctions. To this end, the finite element (FE) (approach is employed.Considering the similarity of molecular mechanics and structural mechanics, the mechanical properties of the utilized FE approach can be derived. The junctions with nanotubes at one side and both sides of the nanosheet are considered. It is shown that the frequencies of both sides located nanotubes are always larger than those of one side located nanotube. Moreover, the influences of geometrical parameters of nanosheet and nanotube on the frequencies of boron nitride nanosheet/nanotube junctions are studied. It is observed that the vibrational behavior of the considered junctions has an inverse relation to the nanotube and nanosheet dimensions.
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Molybdenum disulfide
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Nanomaterials
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Two-dimensional nanosheets have attracted tremendous attention because of their promising practical application and theoretical values. The atomic-thick nanosheets are able to not only enhance the intrinsic properties of their bulk counterparts but also give birth to new promising properties. Herein, we highlight an available pathway to prepare the ultrathin graphitic-phase C3N4 (g-C3N4) nanosheets by a "green" liquid exfoliation route from bulk g-C3N4 in water for the first time. The as-obtained ultrathin g-C3N4 nanosheet solution is very stable in both the acidic and alkaline environment and shows pH-dependent photoluminenscence (PL). Compared to the bulk g-C3N4, ultrathin g-C3N4 nanosheets show enhanced intrinsic photoabsorption and photoresponse, which induce their extremely high PL quantum yield up to 19.6%. Thus, benefiting from the inherent blue light PL with high quantum yields and high stability, good biocompatibility, and nontoxicity, the water-soluble ultrathin g-C3N4 nanosheet is a brand-new but promising candidate for bioimaging application.
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Biocompatibility
Quantum yield
Graphitic carbon nitride
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Specific surface area
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Fabrication of boron nitride nanosheet/polymer composites with tunable thermal insulating properties
Introduction of hydroxylated hBN improved the thermal insulation performance in binary composites, but enhanced the thermal conductivities in the ternary formula.
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The propensity of many 2D materials to oxidize in ambient conditions can complicate production and limit applications potential. Here we describe ambient liquid phase exfoliation of GeS, a layered material known for its chemical instability. Ambient exfoliation in organic solvents such as N-methyl-pyrrolidone yields good quality multi-layer GeS nanosheets. Although oxidation appears to occur with a time constant of ∼10 d, the data suggests it to be limited to nanosheet edges leaving the basal plane intact. The rate of oxidation is slow enough to allow processing of the dispersions. For example, it was possible to size-select GeS nanosheets and characterize the size-dependence of nanosheet optical properties, leading to the observation of significant changes in bandgap with nanosheet thickness. Additionally, we were able to fabricate the nanosheets into lithium ion battery anodes using carbon nanotubes as both binder and conductive additive. These electrodes were relatively stable, showing ∼0.2% capacity decay per cycle, and displayed low-rate capacity of 1523 mAh g−1 which is within 93% of the theoretical value. However, detailed analysis showed relatively poor rate performance, possibly due to nanosheet alignment.
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