High-Efficient Liquid Exfoliation of Boron Nitride Nanosheets Using Aqueous Solution of Alkanolamine

Zhang, Bangwen; Wu, Qian; Yu, Hang; Bulin, Chaoke; Sun, He; Li, Ruihong; Ge, Xin; Xing, Ruiguang

doi:10.1186/s11671-017-2366-4

Cited by 94 publications

(58 citation statements)

References 37 publications

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“…In contrast, these peaks show reduced intensity for exfoliated h‐BNNSs. Moreover, the intensity of the major peak (002) of exfoliated h‐BN decreases due to density change in the exfoliation process [12,13] . Furthermore, the major peak is also slightly shifted to the lower angle (2θ value changes from 26.71° (bulk h‐BN) to 26.68° (exfoliated h‐BNNSs)) which signifies that the interlayer spacing increases after exfoliation and polar solvent molecules are easily entered into the specified interlayer structure.…”

Section: Resultsmentioning

confidence: 97%

“…All layers of h‐BN are associated due to weak Vander Waals forces [10] . Many similarities are also found in the mechanical and thermal properties of graphite and h‐BN [11,12] . An inequality between h‐BN and graphite is found to be that h‐BN is a wide bandgap (∼5–6 eV) semiconductor, whereas graphite is an amazing conductor [13–15] .…”

Section: Introductionmentioning

confidence: 97%

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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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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

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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“…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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“…However, for co-solvents with easily tuneable surface tension (by varying the components ratio), it is found out that the optimal surface tension value is variable, dependent on the type of selected co-solvents. For example, the optimal surface tensions of co-solvents of water with tert-butanol, isopropanol, 1-propyl alcohol, ethanol, methanol, and monoethanolamine are 21.3, 24.5, 25.3, 28, 32.9, and 55 mJ•m −2 respectively [29,32]. In this case, surface tension is not the sole factor that influences the effectiveness of co-solvent exfoliation.…”

Section: Introductionmentioning

confidence: 99%

Co-Solvent Exfoliation of Hexagonal Boron Nitride: Effect of Raw Bulk Boron Nitride Size and Co-Solvent Composition

Nie

Jiang

et al. 2020

Nanomaterials

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Exfoliation of two-dimensional boron nitride nanosheets (BNNSs) from parent bulk material has been receiving intensive attention because of its fascinating physical properties. Liquid exfoliation is a simple, scalable approach to produce single-layer or few-layer BNNS. In this paper, water/propanol co-solvent exfoliation of bulk boron nitride under the assistance of sonication was investigated in detail. Special attention was paid on the effect of raw bulk boron nitride size and co-solvent composition. The results show that sonication of small-size hexagonal boron nitride tends to generate large nanosheets, due to a predominant solvent wedge effect. In addition, it is found that the composition of water/propanol co-solvent has an important effect on exfoliation efficiency. Interestingly, although two isomers of 1-propanol (NPA) and 2-propanol (IPA) have the same molecular weight and similar surface tension, their aqueous solutions allow the formation of boron nitride nanosheets dispersion with markedly different concentrations. It is proposed that due to their spatial configuration difference, NPA with its longer molecular chain and fewer hydrophobic methyl group tends to form dynamic water-NPA clusters with larger size than water-IPA clusters. The hydrodynamic radius of the co-solvent “clusters” was calculated to be 0.72 nm for water/NPA system and 0.44 nm for water/IPA system at their maximum, respectively. Their size changes, represented by two curves, indicate a strong “cluster size” effect on exfoliation efficiency. Our work provides an insight into co-solvent exfoliation of hexagonal boron nitride and emphasizes the importance of co-solvent cluster size in exfoliation efficiency.

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High-Efficient Liquid Exfoliation of Boron Nitride Nanosheets Using Aqueous Solution of Alkanolamine

Cited by 94 publications

References 37 publications

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

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

Spectroscopic Size and Thickness Metrics for Liquid-Exfoliatedh-BN

Co-Solvent Exfoliation of Hexagonal Boron Nitride: Effect of Raw Bulk Boron Nitride Size and Co-Solvent Composition

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