Few-step synthesis, thermal purification and structural characterization of porous boron nitride nanoplatelets

2D boron nitride nanosheets (BNNS) prepared by high-pressure homogenisation: structure and morphology

“…where, d hkl is the interlayer distance in nm corresponding to the crystalline plane (hkl), λ is the X-Ray wavelength source (nm) and θ is the diffraction angle (rad) corresponding to the plane (hkl). By considering the crystalline plane (002) at 2θ = 31°, the interlayer distance is 0.335 nm, in good agreement with values reported previously [36][37][38].…”

“…It should be noted that the peaks are slightly shifted compared to earlier reports, as the diffractometer used in this work has a cobalt X-ray source rather than copper. Therefore, the experimental wavelength is λ CoKα1 = 1.789 Å and not λ CuKα1 = 1.5418 Å [36][37][38]. By comparing the h-BN bulk and BNNS XRD spectra, it is evident that the peaks remained unchanged in both materials in terms of diffraction angle and shape, suggesting that the high-pressure homogenisation exfoliation process did not damage the 10 crystalline structure of the pristine material.…”

Scalable Exfoliation and High‐Efficiency Separation Membrane of Boron Nitride Nanosheets

“…Figure (b) shows two peaks at 816 cm −1 (B−N−B) and 1378 cm −1 (B−N) in the FTIR spectrum of h‐BN, which are attributed to the characteristic bending and stretching vibrations of h‐BN . Two new peaks appear in the FTIR spectrum of h‐BNNS at 3134 cm −1 and 1027 cm −1 , suggesting that the hydroxyl portion of sucrose was grafted to h‐BNNS during the exfoliation .…”

Hydroxylated boron nitride materials: from structures to functional applications

“…The treatment can generate some other defects in HO-BNs. If the temperature reaches 1500°C, the products have to be hydroxylated by the above methods [47][48][49][50][51][52][53] h-BNNSs Sonication-assisted exfoliation It is a facile method to directly exfoliate BN bulk into HO-BNNSs The hydroxyl degree is relatively low For a high hydroxyl degree, some additives have to be introduced, such as, acid, base, salt, etc [31,[55][56][57][58][59][60][61][62][63] Ball-milling-assisted exfoliation Situations similar to ''sonication-assisted exfoliation'' [64][65][66][67][68][69][70][71][72] Hummer's-like routes The use of strong oxidants (i.e., H 2 SO 4 , H 2 O 2 , KMnO 4 , and their mixtures) requires an extra attention Sometimes the oxidization process can lead to the presence of a few by-products of BN dots [73][74][75][76] Multi-step functionalization method It can be divided into two stages: one is from BN to BNNS and then to HO-BNNS, the other is from BN to HO-BN and then to HO-BNNS [82][83][84][85][86][87][88][89][90][91][92] Bottom-up routes It generally requires high temp...…”

“…Bottom-up synthesis routes are also popular for the preparation of hydroxylated BNs. As summarized in Table 1, the resulted products can be divided into two categories: (i) HO-BNs directly obtained via heating temperature in the range of 850-1100°C [47][48][49][50][51]; (ii) h-BNs hydroxylated via post-processing at the temperature of 1500°C [52,53].…”