Liquid‐Phase Exfoliation of Hexagonal Boron Nitride into Boron Nitride Nanosheets in Common Organic Solvents with Hyperbranched Polyethylene as Stabilizer

Ye, Huijian; Lu, Tiemei; Xu, Chenxi; Han, Bo; Meng, Nan; Xu, Lixin

doi:10.1002/macp.201700482

Cited by 55 publications

(41 citation statements)

References 50 publications

(126 reference statements)

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“…The LPE method consists of separating the layers by applying a gentler shear stress to the raw powder material (instead of the extreme mechanical force used during mechanical exfoliation), by immersing it in a liquid solvent exposed to ultrasonication . Depending on the interplane van der Waals forces of each material and the thickness desired, the power, time and type of solvent used during the sonication process should be adjusted . After sonication, a centrifugation step is necessary to separate thin flakes from bigger (useless) particles.…”

Section: Device Fabricationmentioning

confidence: 99%

Engineering Field Effect Transistors with 2D Semiconducting Channels: Status and Prospects

Illarionov

Yalon

et al. 2019

Adv Funct Materials

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The continuous miniaturization of field effect transistors (FETs) dictated by Moore's law has enabled continuous enhancement of their performance during the last four decades, allowing the fabrication of more powerful electronic products (e.g., computers and phones). However, as the size of FETs currently approaches interatomic distances, a general performance stagnation is expected, and new strategies to continue the performance enhancement trend are being thoroughly investigated. Among them, the use of 2D semiconducting materials as channels in FETs has raised a lot of interest in both academia and industry. However, after 15 years of intense research on 2D materials, there remain important limitations preventing their integration in solid-state microelectronic devices. In this work, the main methods developed to fabricate FETs with 2D semiconducting channels are presented, and their scalability and compatibility with the requirements imposed by the semiconductor industry are discussed. The key factors that determine the performance of FETs with 2D semiconducting channels are carefully analyzed, and some recommendations to engineer them are proposed. This report presents a pathway for the integration of 2D semiconducting materials in FETs, and therefore, it may become a useful guide for materials scientists and engineers working in this field.

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Section: Device Fabricationmentioning

confidence: 99%

Engineering Field Effect Transistors with 2D Semiconducting Channels: Status and Prospects

Illarionov

Yalon

et al. 2019

Adv Funct Materials

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“…Up to now, a large number of organic solvents have been explored for liquid exfoliation process of h-BN, including nonvolatile solvents, such as N-methyl-2-pyrrolidone, dimethyl-formanmide, dimethyl sulfoxide [20][21][22], and volatile solvents such as chloroform, isopropyl alcohol, t-butyl alcohol, etc. [23][24][25]. As the most abundant solvent resource on Earth, water is also found to assist with exfoliation and dispersion of BNNSs [26,27].…”

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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“…Ye et al exfoliated bulk h-BN powder in chloroform under sonication using hyperbranched polyethylene (HBPE) as stabilizer. They obtained stable dispersion of h-BNNS in chloroform [ 22 ]. Griffin et al used an aqueous solution of sodium chlorate combined with ultrasonic power to exfoliate h-BN.…”

Section: Introductionmentioning

confidence: 99%

Exfoliation of Hexagonal Boron Nitride (h-BN) in Liquide Phase by Ion Intercalation

et al. 2018

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A green approach to prepare exfoliated hexagonal boron nitride nanosheets (h-BNNS) from commercially pristine h-BN involving a two-step procedure was investigated. The first step involves the dispersion of pristine h-BN within an aqueous solution containing gelatin and potassium or zinc chloride using a sonication method. The second involves the removal of larger exfoliated h-BNNS through a centrifugation procedure. The exfoliation was caused not only by the sonication effect but also by intercalation of K+ and Zn2+ ions. Transmission electronic microscopy, X-ray diffraction and Raman spectroscopy techniques show that the obtained h-BNNS generally display a thickness of about a few (2–3) layers with an exfoliation efficiency as high as 16.3 ± 0.4%.

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Liquid‐Phase Exfoliation of Hexagonal Boron Nitride into Boron Nitride Nanosheets in Common Organic Solvents with Hyperbranched Polyethylene as Stabilizer

Cited by 55 publications

References 50 publications

Engineering Field Effect Transistors with 2D Semiconducting Channels: Status and Prospects

Engineering Field Effect Transistors with 2D Semiconducting Channels: Status and Prospects

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

Exfoliation of Hexagonal Boron Nitride (h-BN) in Liquide Phase by Ion Intercalation

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