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Issue 25, 2017
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Scalable exfoliation for large-size boron nitride nanosheets by low temperature thermal expansion-assisted ultrasonic exfoliation

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Abstract

Hexagonal boron nitride nanosheets (BNNSs) hold great potential in many applications due to their intriguing properties. However, the high-yield preparation of large-size BNNSs still remains a key challenge. Herein, we report a scalable exfoliation process, named as ‘low temperature thermal expansion-assisted ultrasonic exfoliation’, to prepare BNNSs. This method firstly utilizes hydrogen induced low temperature thermal reduction of hydroxyl-functionalized bulk hexagonal boron nitride (BN-OH) to weaken interlayer interaction between adjacent layers, and then employs a brief sonication to completely exfoliate BNNSs from their bulk materials. Few-layer and large-size BNNSs with a high yield of 26% are successfully prepared by this method. Moreover, the large-area BNNSs can effectively enhance the thermal conductivity of thermoplastic polyurethane elastomer on account of the decrease of interfacial thermal resistance. Low temperature thermal expansion-assisted ultrasonic exfoliation can thus provide an efficient approach to scalable fabrication of high-quality BNNSs. Furthermore, this method is promising for the high-yield production of other nanosheets.

Graphical abstract: Scalable exfoliation for large-size boron nitride nanosheets by low temperature thermal expansion-assisted ultrasonic exfoliation

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Publication details

The article was received on 18 Apr 2017, accepted on 06 Jun 2017 and first published on 07 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01692A
Citation: J. Mater. Chem. C, 2017,5, 6359-6368
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    Scalable exfoliation for large-size boron nitride nanosheets by low temperature thermal expansion-assisted ultrasonic exfoliation

    F. Yuan, W. Jiao, F. Yang, W. Liu, J. Liu, Z. Xu and R. Wang, J. Mater. Chem. C, 2017, 5, 6359
    DOI: 10.1039/C7TC01692A

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