Functionalization and Dispersion of Hexagonal Boron Nitride (h‐BN) Nanosheets Treated with Inorganic Reagents

Abstract

A mixture of bulk hexagonal boron nitride (h-BN) with hydrazine, 30% H(2)O(2), HNO(3)/H(2)SO(4), or oleum was heated in an autoclave at 100 °C to produce functionalized h-BN. The product formed stable colloid solutions in water (0.26-0.32 g L(-1)) and N,N-dimethylformamide (0.34-0.52 g L(-1)) upon mild ultrasonication. The yield of "soluble" h-BN reached about 70 wt%. The dispersions contained few-layered h-BN nanosheets with lateral dimensions in the order of several hundred nanometers. The functionalized dispersible h-BN was characterized by IR spectroscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV/Vis spectroscopy, X-ray diffraction (XRD), dynamic light scattering (DLS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM). It is shown that h-BN preserves its hexagonal structure throughout the functionalization procedure. Its exfoliation into thin platelets upon contact with solvents is probably owing to the attachment of hydrophilic functionalities.

Tunable porous boron nitride: Investigating its formation and its application for gas adsorption

“…As seen in 191.1 eV for B 1s and 397.6-398.7 eV for N 1s for boron nitride [35,36]. The B 1s and N 1s spectra of porous BN also exhibited shake-up satellite peaks, which confirm the presence of sp 2 -hybridised BN in the hexagonal phase, as previously reported [37][38][39]. In addition to BN, XPS revealed the presence of between 10 and 13 at.% ± 1 at.% of oxygen impurities (Fig.…”

Stable colloidal boron nitride nanosheet dispersion and its potential application in catalysis

“…29 Considering the detection limit of XRD measurement, Raman spectroscopy was further applied to explore the phase purity of the as-obtained h-BN powder. 11,24,45 In N1s spectra, the binding energy at 398.2 eV is referred to N-B bonds, 24,46 accompanied by a rather small peak attributed to N-C bonds at 399.3 eV. 2a illustrates the Raman spectrum of the h-BN powder conducted under ambient conditions with a 785 nm laser line.…”

Surface modification to test “gaseous model” for BN nanotubes formation under the concentrated light and its application for graphene

“…It was demonstrated that h-BN saves its hexagonal structure throughout the functionalization procedure. Its exfoliation into thin platelets upon contact with solvents is probably owing to the attachment of hydrophilic functionalities [12]. The chemical stability of BN heated at high temperatures increases as compared to the chemical stability of untreated powders due to decrease in the reactive surface and formation of more perfect crystal structure.…”