Controlled Gas Exfoliation of Boron Nitride into Few-Layered Nanosheets

Zhu, Wenshuai; Gao, Xiang; Li, Qian; Li, Hongping; Chao, Yanhong; Li, Meijun; Mahurin, Shannon M.; Li, Huaming; Zhu, Huiyuan; Dai, Sheng

doi:10.1002/anie.201605515

Controlled Gas Exfoliation of Boron Nitride into Few-Layered Nanosheets

Journal Article · Fri Jul 22 00:00:00 EDT 2016 · Angewandte Chemie (International Edition)

DOI:https://doi.org/10.1002/anie.201605515· OSTI ID:1324184

Zhu, Wenshuai ^[1]; Gao, Xiang ^[2]; Li, Qian ^[2]; Li, Hongping ^[3]; Chao, Yanhong ^[3]; Li, Meijun ^[4]; Mahurin, Shannon M. ^[2]; Li, Huaming ^[3]; Zhu, Huiyuan ^[2]; Dai, Sheng ^[5]

Jiangsu Univ., Zhenjiang (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Jiangsu Univ., Zhenjiang (China)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

The controlled exfoliation of hexagonal boron nitride (h-BN) into single- or few-layered nanosheets remains a grand challenge and becomes the bottleneck to essential studies and applications of h-BN. Here, we present an efficient strategy for the scalable synthesis of few-layered h-BN nanosheets (BNNS) via a novel gas exfoliation of bulk h-BN in liquid N₂ (L-N₂). The essence of this strategy lies in the combination of a high temperature triggered expansion of bulk h-BN and the cryogenic L-N₂ gasification to exfoliate the h-BN. The produced BNNS after ten cycles (BNNS-10) consisted primarily of fewer than five atomic layers with high a mass yield of 16~20%. N₂ sorption and desorption isotherms show that the BNNS-10 exhibited a much higher specific surface area of 278 m²/g^–1 than that of bulk BN (10 m²/g^–1). Through the investigation of the exfoliated intermediates combined with a theoretical calculation, we found that the huge temperature variation initiates the expansion and curling of the bulk h-BN. Subseqently, the L-N₂ penetrates into the interlayers of h-BN along the curling edge, followed by an immediate drastic gasification of L-N₂, further peeling off h-BN. In conclusion, this novel gas exfoliation of high surface area BNNS not only opens up potential opportunities for wide applications, but also can be extended to produce other layered materials with high yeilds.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: ORNL LDRD Director's R&D; USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1324184

Journal Information:: Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 36 Vol. 55; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
boron nitride
exfoliation
liquid nitrogen
nanosheets
thermal expansion

Controlled Gas Exfoliation of Boron Nitride into Few-Layered Nanosheets

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