Preparation of few layers hexagonal boron nitride nanosheets via high-pressure homogenization

Shang, Jingqi; Xue, Feng; Fan, Chaojun; Ding, Enyong

doi:10.1016/j.matlet.2016.05.154

Cited by 45 publications

(27 citation statements)

References 25 publications

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“…Liquid phase exfoliation is a versatile nanosheet production method which exfoliates layered crystals down to few-layered nanosheets in appropriate stabilizing liquids. [23][24] It has been applied to a range of layered crystals including graphite, h-BN [5][6][25][26][27][28][29] and MoS 2 and tends to yield polydisperse samples of nanosheets with broad lateral size (~100-1000 nm) and thickness (~1-20 layers) distributions. 23,[30][31] As a result, centrifugation-based size selection is required to enable any study where well-defined sizes are required.…”

Section: Size Selection Of Bnmentioning

confidence: 99%

Spectroscopic Size and Thickness Metrics for Liquid-Exfoliatedh-BN

et al. 2018

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For many 2D materials, optical and Raman spectra are richly structured, and convey information on a range of parameters including nanosheet size and defect content. By contrast, the equivalent spectra for h-BN are relatively simple, with both the absorption and Raman spectra consisting of a single feature each, disclosing relatively little information.Here, the ability to size-select liquid-exfoliated h-BN nanosheets has allowed us to comprehensively study the dependence of h-BN optical spectra on nanosheet dimensions. We find the optical extinction coefficient spectrum to vary systematically with nanosheet lateral size due to the presence of light scattering. Conversely, once light scattering has been decoupled to give the optical absorbance spectra, we find the size dependence to be mostly removed save for a weak but well-defined variation in energy of peak absorbance with nanosheet thickness. This finding is corroborated by our ab initio GW and Bethe Salpeter equation calculations, which include electron correlations and quasiparticle self-consistency (QSGW). In addition, while we find the position of the sole h-BN Raman line to be invariant with nanosheet dimensions, the linewidth appears to vary weakly with nanosheet thickness.These size-dependent spectroscopic properties can be used as metrics to estimate nanosheet thickness from spectroscopic data.

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Section: Size Selection Of Bnmentioning

confidence: 99%

Spectroscopic Size and Thickness Metrics for Liquid-Exfoliatedh-BN

et al. 2018

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“…It is in the form of a white powder, hence sometimes it is also known as “white graphite” [6] . Just as the carbon atoms inside the graphite join to form an sp 2 hexagonal structure, the atoms of boron and nitrogen in a layer of h‐BN are also alternately linked to each other by strong covalent bonds and thus form a honeycomb‐like structure [7–9] . All layers of h‐BN are associated due to weak Vander Waals forces [10] .…”

Section: Introductionmentioning

confidence: 99%

An Innovative Method for Large‐Scale Synthesis of Hexagonal Boron Nitride Nanosheets by Liquid Phase Exfoliation

Mittal

Kedawat²,

Kanika

et al. 2020

ChemistrySelect

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Hexagonal boron nitride nanosheets (h‐BNNSs), the geometry similar to that of two‐dimensional (2D) graphene has engrossed substantial attention due to its promising superior thermal, electrical, and dielectric properties for both fundamental studies as well as potential applications. Due to the strong covalent bond interactions in bulk hexagonal boron nitride (h‐BN), the high yield synthesis of large‐size h‐BNNSs is still a challenging task. In this report, a facile and innovative mixed solvent was carried out in the liquid phase exfoliation method via ultra‐sonication to obtain h‐BNNSs in large quality. The mixed solventconsisting of a mixture of Isopropyl alcohol (IPA) and De‐ionized (DI) water (in 3 : 7 ratio) is used for the highly efficient and cost‐effective synthesis of h‐BNNSs. In an optimized condition, the production yield of h‐BNNSs is approximately 90 % with a concentration of 0.6mg/mL. Here, the Lewis acid‐base interaction mechanism is responsible for the exfoliation of h‐BN due to the electron deficient boron atoms. The exfoliated ultra‐thin h‐BNNSs show better results, which is confirmed by Raman spectroscopy. Hence, our study provides a simple, large scale and economical exfoliation approach for the preparation of h‐BNNSs in next generation potential applications.

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“…The physicochemical properties of BNNS was examined thoroughly by surface characterization, morphology determination, crystallographic and thermal analysis, which are essential to reveal nanostructure and material properties. A laboratory scale (0.5g) high-pressure homogenisation process was used recently to prepare BNNS [30].…”

Section: Introductionmentioning

confidence: 99%