Synthesis of Low-Density, Carbon-Doped, Porous Hexagonal Boron Nitride Solids

Gautam, Chandkiram; Tiwary, Chandra Sekhar; Jose, Sujin P.; Brunetto, Gustavo; Özden, Şehmus; Vinod, Soumya; Raghavan, Praveen; Biradar, Santoshkumar; Galvão, Douglas S.; Ajayan, Pulickel M.

doi:10.1021/acsnano.5b05847

Cited by 84 publications

(42 citation statements)

References 48 publications

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“…Consequently, while idealised basal surfaces should contain hexagons composed of boron and nitrogen alone, it is likely that the edges of hBN sheets will contain species such as hydroxyl groups. Indeed, examination of the as-supplied hBN power used here by Fourier-transform infrared spectroscopy (FTIR) revealed the presence of weak absorption bands centred at 3131 and 3420 cm -1 , which can be associated the stretching of O-H and N-H bonds, as reported elsewhere [27][28][29][30][31]. However, if the true structure were to differ markedly from the ideal, then the presence of many polar surface groups would be expected to lead to hydrogen bonds with any labile polar species present in the system, most notably, water.…”

Section: Resultssupporting

confidence: 80%

Enhanced dielectric properties of polyethylene/hexagonal boron nitride nanocomposites

et al. 2017

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A range of nanocomposites based on a polyethylene polymer and hexagonal boron nitride (hBN) filler have been explored in this study. The dielectric properties of the nanocomposites, which consisted of 2, 5, 10, 20 and 30 wt% of hBN, have been compared to the dielectric properties of the unfilled polyethylene blend. Scanning electron microscopy revealed that the hBN was uniformly distributed in the polyethylene matrix, although large amounts of agglomerates were present in the nanocomposites containing more than 10 wt% of hBN. The incorporation of hBN into polyethylene resulted in a highly disordered morphology in comparison with the unfilled polyethylene, in which this effect was more pronounced with increasing hBN content. This is consistent with the increasing crystallisation temperature as the hBN content increases, as shown by differential scanning calorimetry, where the hBN acted as a highly effective nucleating due to the strong interactions between the polyethylene and the hBN. This strong interaction is again reflected in the thermal decomposition temperature which similarly increases with increasing hBN content. The study demonstrates the remarkable electrical properties of the prepared nanocomposites, where the breakdown strength monotonically increased as a function of hBN content, even with a very high 30 wt% of hBN. The improvement in electrical properties, even at high hBN concentrations, is contradictory to the reported results in the literature and is mainly attributed to the hydrophobic surface of the hBN particles.

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Section: Resultssupporting

confidence: 80%

Enhanced dielectric properties of polyethylene/hexagonal boron nitride nanocomposites

et al. 2017

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“…The TEM images at low magnification (Figure c,f, inset, and Figures S16 and S17, Supporting Information) also further affirm the different shapes between h‐CBN and h‐BN . Meanwhile, compared to h‐BN, the selected area electron diffraction pattern of h‐CBN shows some weak diffraction spots in the (002) diffraction ring (Figure S18, Supporting Information) . In addition, h‐CBN sheets are thinner than h‐BN (Figure S19, Supporting Information).…”

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confidence: 68%

Doping Nanoscale Graphene Domains Improves Magnetism in Hexagonal Boron Nitride

Fan

Yuan

et al. 2019

Advanced Materials

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Carbon doping can induce unique and interesting physical properties in hexagonal boron nitride (h‐BN). Typically, isolated carbon atoms are doped into h‐BN. Herein, however, the insertion of nanometer‐scale graphene quantum dots (GQDs) is demonstrated as whole units into h‐BN sheets to form h‐CBN. The h‐CBN is prepared by using GQDs as seed nucleations for the epitaxial growth of h‐BN along the edges of GQDs without the assistance of metal catalysts. The resulting h‐CBN sheets possess a uniform distrubution of GQDs in plane and a high porosity macroscopically. The h‐CBN tends to form in small triangular sheets which suggests an enhanced crystallinity compared to the h‐BN synthesized under the same conditions without GQDs. An enhanced ferromagnetism in the h‐CBN emerges due to the spin polarization and charge asymmetry resulting from the high density of CN and CB bonds at the boundary between the GQDs and the h‐BN domains. The saturation magnetic moment of h‐CBN reaches 0.033 emu g−1 at 300 K, which is three times that of as‐prepared single carbon‐doped h‐BN.

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“…Benefiting from its strong resistance to oxidation, the materials with saturated adsorption can be cleaned just by burning in air (Figure e–h). The temperature of heat treatment in this method can be reduced from ≈1000 °C to 300 °C by changing the sources to melamine and boric acid . However, the carbon component cannot be completely removed at this low temperature, and the resulting sample is highly carbon doped.…”

Section: Synthesis Properties and Applications Of Two Dimensional H‐bnmentioning

confidence: 99%

Boron Nitride Nanostructures: Fabrication, Functionalization and Applications

Yin

Yang

et al. 2016

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Boron nitride (BN) structures are featured by their excellent thermal and chemical stability and unique electronic and optical properties. However, the lack of controlled synthesis of quality samples and the electrically insulating property largely prevent realizing the full potential of BN nanostructures. A comprehensive overview of the current status of the synthesis of two-dimensional hexagonal BN sheets, three dimensional porous hexagonal BN materials and BN-involved heterostructures is provided, highlighting the advantages of different synthetic methods. In addition, structural characterization, functionalizations and prospective applications of hexagonal BN sheets are intensively discussed. One-dimensional BN nanoribbons and nanotubes are then discussed in terms of structure, fabrication and functionality. In particular, the existing routes in pursuit of tunable electronic and magnetic properties in various BN structures are surveyed, calling upon synergetic experimental and theoretical efforts to address the challenges for pioneering the applications of BN into functional devices. Finally, the progress in BN superstructures and novel B/N nanostructures is also briefly introduced.

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Synthesis of Low-Density, Carbon-Doped, Porous Hexagonal Boron Nitride Solids

Cited by 84 publications

References 48 publications

Enhanced dielectric properties of polyethylene/hexagonal boron nitride nanocomposites

Enhanced dielectric properties of polyethylene/hexagonal boron nitride nanocomposites

Doping Nanoscale Graphene Domains Improves Magnetism in Hexagonal Boron Nitride

Boron Nitride Nanostructures: Fabrication, Functionalization and Applications

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