Facile synthesis of 3D boron nitride nanoflowers composed of vertically aligned nanoflakes and fabrication of graphene-like BN by exfoliation

Lian, Gang; Zhang, Xiao; Tan, Miao; Zhang, Shunjie; Cui, Deliang; Wang, Qilong

doi:10.1039/c0jm04503a

Cited by 87 publications

(55 citation statements)

References 75 publications

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“…Both the as‐prepared BNQDs and BNNSs exhibit absorption at around 1378 and 800 cm −1 , which are attributed to B–N stretching and B–N bending modes, respectively . Clearly, the peaks coming from methyl (CH 3 , 2931 and 2857 cm −1 ) groups of DMF can be observed in the FT‐IR spectrum of BNNSs after exfoliation and these two peaks become more obvious after solvothermal treatment, demonstrating that DMF molecules are attached to the surface of the BNNSs via a nucleophilic attack of O to B in terms of the Lewis acid–base interaction . Meanwhile, the vibrations at the regions of 1750–1550, 1150–850, and 750–450 cm −1 might be attributed to the C–(BN), B–O, and O–B–O vibrations, respectively.…”

Section: Resultsmentioning

confidence: 96%

Controllable Synthesis of Highly Luminescent Boron Nitride Quantum Dots

Tay

Tsang³

et al. 2015

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Boron nitride quantum dots (BNQDs), as a new member of heavy metal-free quantum dots, have aroused great interest in fundamental research and practical application due to their unique physical/chemical properties. However, it is still a challenge to controllably synthesize high-quality BNQDs with high quantum yield (QY), uniform size and strong fluorescent. In this work, BNQDs have been successfully fabricated by the liquid exfoliation and the subsequent solvothermal process with respect to its facileness and easy large scale up. Importantly, BNQDs with high-quality can be controllably obtained by adjusting the synthetic parameters involved in the solvothermal process including filling factor, synthesis temperature, and duration time. Encouragingly, the as-prepared BNQDs possess strong blue luminescence with QY as high as 19.5%, which can be attributed to the synergetic effect of size, surface chemistry and edge defects. In addition, this strategy presented here provides a new reference for the controllable synthesis of other heavy metal-free QDs. Furthermore, the as-prepared BNQDs are non-toxic to cells and exhibit nanosecond-scaled lifetimes, suggesting they have great potential biological and optoelectronic applications.

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Section: Resultsmentioning

confidence: 96%

Controllable Synthesis of Highly Luminescent Boron Nitride Quantum Dots

Tay

Tsang³

et al. 2015

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“…The as‐prepared b1‐BNQDs, b2‐BNQDs, g‐BNQDs, and bulk BN all showed absorption at around 1390 and 784 cm −1 , which should be attributed to B–N stretching and B–N bending modes, respectively. [15a] Compared with the bulk BN starting materials, new characteristic peaks in the FTIR spectrum of BNQDs were observed at 2931, ≈1637, and ≈1098 cm −1 , corresponding to –CH 3 , C–(BN), and N–B–O vibrations, respectively, which demonstrated the attachment of the solvent molecules and oxygen‐containing functional groups onto the BNQDs surface . In addition, the relative intensity of N–B–O to B–N was the highest in g‐BNQDs and the smallest in b1‐BNQDs, suggesting the oxygen‐containing functional groups attached to the surface of g‐BNQDs were more than those to other two.…”

Section: Resultsmentioning

confidence: 99%

Boron Nitride Quantum Dots with Solvent‐Regulated Blue/Green Photoluminescence and Electrochemiluminescent Behavior for Versatile Applications

Liu

Wang

et al. 2016

Advanced Optical Materials

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such as layered transition metal dichalcogenides (TMDs), [2] hexagonal boron nitride (h-BN), [3] metal halides, [4] and black phosphorus, [5] which opened up a new horizon for a novel class of low-dimensional systems with superior properties for applications in optoelectronics, [6] energy conversion, [7] and catalysis. [8] Among these, h-BN nanosheet has its peculiar and fascinating properties such as good electrical insulation, [9] high-temperature stability, [10] high mechanical strength, [11] large thermal conductivity, [12] low toxicity and chemical stability, [13] leading to a variety of potential applications as both structural and electronic materials. [14] With further reducing the size of the layered BN sheets to less than 10 nm, 0D BN quantum dots (BNQDs) with excellent fluorescence properties and good dispersibility can be endowed due to the quantum confinement, edge effects, and defect centers. [13][14][15] Combining with the intrinsic properties of BN, BNQDs were supposed to be promising agents in biological and optoelectronic applications. [15b] However, compared with the widely studied 2D BN nanosheet, [9][10][11]16] BNQDs were much less reported than expected. [13][14][15] First, further exploration is required for the preparation of desired BNQDs products. BNQDs were initially prepared via high intensity ultrasound and subsequent refluxing. [14a] Allwood et al. have also successfully fabricated monolayer BNQDs via three steps of potassium-intercalation, deintercalation, and disintegration of BN edges, but only low quantum yield (QY) of 2.5% was achieved. [15a] Recently, sonication-solvothermal strategy was found to be a facile and universal method for the generation of BNQDs with relatively high QY of 8.6% or 19.5%. [13,15b] Although the filling factor of the autoclave, synthesis temperature and reaction time in the solvothermal process have been investigated, [13] little attention has been paid to how different solvents affect the properties of the BNQDs, which is usually an important parameter to influence the optical properties and QYs of the zero-dimensional QDs. [17] Second, besides the most frequently studied PL properties, electrochemiluminescence (ECL) is also an interesting characteristic Exploration of novel optical features, generation mechanisms, and versatile applicability of boron nitride quantum dots (BNQDs) is still in nascent stage. Herein, BNQDs are prepared using liquid exfoliation-solvothermal treatment of bulk BN in three different solvents. The photoluminescence of BNQDs is blue in ethanol (or N,N-dimethylformamide (DMF)) and green in N-methyl-2-pyrrolidone (NMP) under the same UV-irradiation, respectively.The quantum yields (QYs) and average lateral sizes of the BNQDs are 12.6% and 4.1 ± 0.2 nm, 16.4%, and 2.8 ± 0.3 nm, as well as 21.3% and 2.0 ± 0.2 nm in solvents of ethanol, DMF, NMP, respectively. The distinct sizes, QYs, and optical properties of the BNQDs are found to depend on the polarity of these solvents. Different BNQDs can be chosen on-demand for versatile...

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“…5,6 Liquid exfoliation performed by treating bulk h-BN powder with organic solvents and energy, is a simple method to produce BNNS. [7][8][9] However, many of these solvents to work with in this method are environmental unfriendly and the period of time for treating samples is long (~6-8 days). Therefore, it is of crucial importance to explore a simple and cost-effective strategy to generate large-scale and high quality BNNSs.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Hexagonal Boron Nitride Nanosheets by Using a Simple Thermal Exfoliation Process

Chen

2016

J Chinese Chemical Soc

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A simple and inexpensive method to exfoliate boron nitride powder to form boron nitride nanosheets (BNNSs) with few layers was achieved by using a physically thermal process. The obtained BNNSs were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), IR spectroscopy, and Raman spectroscopy. The size distribution of the sheets and average sheet size is in the range of 80-380 nm and 200 ± 62 nm, respectively, and the pure phase h-BN products were confirmed. XPS result showed the B/N atomic ratio to be 0.99. In addition, the BNNSs can well disperse in aqueous solution to form a cloudy suspension and importantly, can remain suspended for 1 month without precipitate, which would have good potential in a wide range of applications.

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Facile synthesis of 3D boron nitride nanoflowers composed of vertically aligned nanoflakes and fabrication of graphene-like BN by exfoliation

Cited by 87 publications

References 75 publications

Controllable Synthesis of Highly Luminescent Boron Nitride Quantum Dots

Controllable Synthesis of Highly Luminescent Boron Nitride Quantum Dots

Boron Nitride Quantum Dots with Solvent‐Regulated Blue/Green Photoluminescence and Electrochemiluminescent Behavior for Versatile Applications

Fabrication of Hexagonal Boron Nitride Nanosheets by Using a Simple Thermal Exfoliation Process

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