Impact of Bi Doping into Boron Nitride Nanosheets on Electronic and Optical Properties Using Theoretical Calculations and Experiments (original) (raw)

Boron Radicals Identified as the Source of the Unexpected Catalysis by Boron Nitride Nanosheets

ACS Nano, 2019

Atomically thin boron nitride (BN) nanosheets were generally considered to be chemically inert until the recent discovery of the surprising catalysis. However, the origin of this unusual catalytic activity remains unclear. We have observed the free boron radicals at the edges and defective sites of boron nitride nanosheets, and demonstrated with both experimental and theoretical approaches that the boron radicals in the nanosheets can catalyze the chromogenic

Functionalized boron nitride with enhanced property

3RD INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC-2019)

Boron nitride (BN) is a highly stable two-dimensional layered material with equal number of boron and nitrogen atoms covalently bonded to each other. Atomically thin BN have enhanced properties over its bulk material. Atomically thin BN or exfoliated BN have better heat conducting properties, mechanical properties, optical and electrical properties. In the present work, BN has been exfoliated by ultrasonication method using an organic solvent N, N-Dimethyl Formamide commonly called as DMF. Hexagonal BN nanoparticles have been commonly used as perfect filler material for the preparation of nanocomposites. In the present work, boron nitride nanosheets (BNNS) has been prepared and functionalized with ferrous sulphate to enhance the optical property of the material. The prepared sample were characterized by XRD analysis, FTIR spectroscopy, Raman spectroscopy and UV-Visible spectroscopy.

Bactericidal behavior of chemically exfoliated boron nitride nanosheets doped with zirconium

In this work, boron nitride nanosheets (BNNS) were produced through chemical exfoliation of bulk boron nitride (BN). Furthermore, hydrothermal technique was used to incorporate various concentrations (2.5, 5, 7.5, and 10 wt%) of zirconium (Zr) as a dopant. The prepared undoped and doped BN samples were evaluated for its antimicrobial activity against E. coli and S. aureus. Structural analysis was undertaken using x-ray diffraction which identified the presence of hexagonal BN. FTIR and Raman spectroscopy were utilized to outline IR fingerprint and electronic properties of the synthesized material. Morphological information was obtained through micrographs extracted using field emission scanning electron spectroscope (FESEM) and high resolution transmission electron microscope (HRTEM), while d-spacing was also calculated through HRTEM analysis. Optical properties and emission spectra were examined by applying UV-vis and photoluminescence spectroscope (PL); whereas, band gap analysis was carried out via Tauc plot. Zr-doped BN nanosheets at increasing concentrations (0.5, 1.0 mg/50 μl) revealed enhanced antibacterial activity against E. coli compared to S. aureus (p < 0.05).

Boron carbon nitride nanosheets in water and wastewater treatment: A critical review

Desalination

The availability and accessibility of clean and secure water supplies are pressing technological and scientific issues worldwide. As a result of global water constraints, wastewater treatment and reuse are being evaluated as feasible alternatives to fresh water for agricultural irrigation and domestic and industrial purposes. Boron carbon nitride (BCN) nanosheets have been studied intensively in the last decade in batteries, biosensors, and capacitors, and for use as catalysts, and they have recently been used in wastewater treatment. BCN materials, along with their synthesis processes, characteristics, and application areas in water and wastewater treatment, are discussed thoroughly in this paper. Additionally, synthesis processes for ternary BCN compounds, including chemical vapor deposition, ion beam-aided deposition, magnetron sputtering, and pulsed laser deposition, are described. BCN materials have also been explored because of their flexible electrical features, excellent mechanical strength, outstanding unreactivity, and significant stability, which make them appropriate for a range of severe environment applications. Thus, the use of BCN materials as photocatalysts and adsorbents and in electrochemical reduction and capacitive deionization are also discussed thoroughly. The highest ammonia production of 172,226.5 μg/h.mg.cat and faradic efficiency of 95.3% have been obtained using the BCN@Cu/CNT catalyst, whereas the ammonia production and FE values for metal-free BCN are 7.75 μg/h.mg.cat and 13.8%. Moreover, the maximum attained adsorption capacities of BCN nanosheets for Pb 2+ and Hg 2+ are 210 and 625 mg/g, respectively. Overall, this review indicates that essential work on BCN nanosheets is still needed. Future research should focus on the development of BCN nanostructures to encourage multidisciplinary research.

Hydrothermal synthesis of highly stable boron nitride nanoparticles

Materials Today: Proceedings, 2020

In this work, Boron Nitride (BN) nano-particles have been synthesized by hydrothermal treatment using boric acid and an amine-based nitrogen source. BN, a structural analogue of carbon, has garnered considerable attention in the recent years due to its high thermal conductivity, chemical stability, low toxicity, large intrinsic band gap and chemical inertness. The synthesized nanoparticles are non-toxic and heavy metal free exhibiting strong blue fluorescence under UV illumination. The BN nanoparticles were characterized by Transmission Electron Microscopy (TEM), UV-Vis Spectroscopy and Fourier Transform Infrared Spectroscopy (FT-IR) and Zeta Potential measurement. FT-IR analysis revealed the formation of B-N, O-H and N-H bonds. In case of UV-Vis spectroscopy, absorption wavelength was observed at 264 nm. The synthesized nanoparticles may have potential applications in the field of fluorescence sensing and bioimaging.

Electronic Structure and Reactivity of Boron Nitride Nanoribbons with Stone-Wales Defects

Journal of Chemical Theory and Computation, 2009

Gradient-corrected density functional theory (DFT) computations were performed to investigate the geometry, electronic property, formation energy, and reactivity of Stone-Wales (SW) defects in zigzag-edge and armchair-edge boron nitride nanoribbons (BNNRs). The formation energies of SW defects increase with an increase in the widths of BNNRs and are orientation-dependent. SW defects considerably reduce the band gaps of BNNRs independent of the defect orientations. In addition, the local chemical reactivity of SW defects and edge sites in zigzag-edge and armchair-edge BNNRs was probed with the CH 2 cycloaddition reaction. Independent of the nanoribbon types and the SW defect orientations, the reactions at SW defect sites are more exothermic than those at the center of perfect BNNRs, and the newly formed B-B and N-N bonds are the most reactive sites, followed by the 5-7 ring fusions.