Sonication-assisted alcoholysis of boron nitride nanotubes for their sidewalls chemical peeling

Kim, Dukeun; Nakajima, Sayuka; Sawada, Tatsuo; Iwasaki, Mahiro; Kawauchi, Susumu; Chen, Zhi; Bando, Yoshio; Golberg, Dmitri; Serizawa, Takeshi

doi:10.1039/c5cc00388a

Cited by 63 publications

(47 citation statements)

References 38 publications

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“…These thermal, elemental, and spectroscopy analyses results together provide strong evidence that the exfoliated BNNSs are covalently grafted with sucrose moieties and hydroxyl and amine groups (‐OH and ‐NH x ). It is likely that during the mechanochemical exfoliation, sucrose molecules react with active edges or surface defects in the fractured BNNSs, forming boronate ester, amine, and other possible functional groups, similar to the alcoholysis of BN nanotubes in liquid alcohols by ulrasonication reported earlier …”

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confidence: 59%

Simultaneous Production and Functionalization of Boron Nitride Nanosheets by Sugar‐Assisted Mechanochemical Exfoliation

et al. 2019

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Due to their extraordinary properties, boron nitride nanosheets (BNNSs) have great promise for many applications. However, the difficulty of their efficient preparation and their poor dispersibility in liquids are the current factors that limit this. A simple yet efficient sugar‐assisted mechanochemical exfoliation (SAMCE) method is developed here to simultaneously achieve their exfoliation and functionalization. This method has a high actual exfoliation yield of 87.3%, and the resultant BNNSs are covalently grafted with sugar (sucrose) molecules, and are well dispersed in both water and organic liquids. A new mechanical force–induced exfoliation and chemical grafting mechanism is proposed based on experimental and density functional theory investigations. Thanks to the good dispersibility of the nanosheets, flexible and transparent BNNS/poly(vinyl alcohol) (PVA) composite films with multifunctionality is fabricated. Compared to pure PVA films, the composite films have a remarkably improved tensile strength and thermal dissipation capability. Noteworthy, they are flame retardant and can effectively block light from the deep blue to the UV region. This SAMCE production method has proven to be highly efficient, green, low cost, and scalable, and is extended to the exfoliation and functionalization of other two‐dimensional (2D) materials including MoS2, WS2, and graphite.

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confidence: 59%

Simultaneous Production and Functionalization of Boron Nitride Nanosheets by Sugar‐Assisted Mechanochemical Exfoliation

et al. 2019

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“…With the assistance of sonication, the walls of highly-crystalline BNNTs were found to be peeled off and formed BN nanoribbons (BNNRs) in various primary alcohols solvents. 80 IR tracking revealed the formation of B-O, B-O-C and O-B-O vibration modes in a product, which were not originally present in the BNNTs. These alcoholysized compounds with their edges terminated by -OR groups can be well dispersed in alcohol solvents.…”

Section: Hydroxyl (-Oh) and Alkoxy (-Or) Groupsmentioning

confidence: 97%

Functionalized hexagonal boron nitride nanomaterials: emerging properties and applications

et al. 2016

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Functionalization is an important way to breed new properties and applications for a material. This review presents an overview of the progresses in functionalized hexagonal boron nitride (h-BN) nanomaterials. It begins with an introduction of h-BN structural features, physical and chemical properties, followed by an emphasis on the developments of BN functionalization strategies and its emerging properties/applications, and ends with the research perspectives. Different functionalization methods, including physical and chemical routes, are comprehensively described toward fabrication of various BN derivatives, hetero- and porous structures, etc. Novel properties of functionalized BN materials, such as high water solubility, excellent biocompatibility, tunable surface affinities, good processibility, adjustable band gaps, etc., have guaranteed wide applications in biomedical, electronic, composite, environmental and "green" energy-related fields.

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“…1 . Our previous work reported unzipping of BNNTs into BNNRs in alcohol under sonication which indicated that alcohol molecules activated BN bonds through coordination for subsequent hydrolysis [ 17 ]. Furthermore Liao et al [ 19 ] showed that chemical sharpening, shortening, and unzipping of BNNTs occurred in water-ammonia mixture because ammonia molecules coordinated to the B atoms as Lewis base, followed by hydrolysis of BN bonds.…”

Section: Resultsmentioning

confidence: 99%

“…Several researchers including our group have studied simple ways of producing BNNRs without using pre-production step, special treatment, and equipment. Our group discovered that longitudinally unzipped BNNTs can be produced via alcoholysis using alcohol with long alkyl chains under sonication because the chemical interaction between boron atom of BNNTs and oxygen atoms of alcohol lead to generation of alkyl chain-connected BNNRs [ 17 ]. However, alkyl chains attached on BNNR edges largely deteriorate their chemical reactivity.…”

Section: Introductionmentioning

confidence: 99%

Hydrolytic Unzipping of Boron Nitride Nanotubes in Nitric Acid

2017

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Boron nitride nanoribbons (BNNRs) have very attractive electrical and optical properties due to their unique edge states and width-related properties. Herein, for the first time, BNNRs were produced by a simple reflux of boron nitride nanotubes (BNNTs) in nitric acid containing water, which had led to unzipped sidewalls through hydrolysis. Their high reactivity that originated from edges was verified via a strong interaction with methylene blue.

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Sonication-assisted alcoholysis of boron nitride nanotubes for their sidewalls chemical peeling

Cited by 63 publications

References 38 publications

Simultaneous Production and Functionalization of Boron Nitride Nanosheets by Sugar‐Assisted Mechanochemical Exfoliation

Simultaneous Production and Functionalization of Boron Nitride Nanosheets by Sugar‐Assisted Mechanochemical Exfoliation

Functionalized hexagonal boron nitride nanomaterials: emerging properties and applications

Hydrolytic Unzipping of Boron Nitride Nanotubes in Nitric Acid

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