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Title: Controlled Gas Exfoliation of Boron Nitride into Few-Layered Nanosheets

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [2];  [3];  [3];  [4];  [2];  [3];  [2];  [5]
  1. Jiangsu Univ., Zhenjiang (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Jiangsu Univ., Zhenjiang (China)
  4. Univ. of Tennessee, Knoxville, TN (United States)
  5. 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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1324184
Journal Information:
Angewandte Chemie (International Edition), Vol. 55, Issue 36; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 230 works
Citation information provided by
Web of Science

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Construction of a Nanoporous Highly Crystalline Hexagonal Boron Nitride from an Amorphous Precursor for Catalytic Dehydrogenation journal June 2019
Enhancing flame retardance of epoxy resin by incorporation into ammonium polyphosphate/boron nitride nanosheets/zinc ferrite three‐dimensional porous aerogel via vacuum‐assisted infiltration journal October 2019
Boron and Nitride Dual vacancies on Metal‐Free Oxygen Doping Boron Nitride as Initiating Sites for Deep Aerobic Oxidative Desulfurization journal March 2020
2D Crystal–Based Fibers: Status and Challenges journal August 2019
The art of two-dimensional soft nanomaterials journal June 2019
Current Review on Synthesis, Composites and Multifunctional Properties of Graphene journal March 2019
Reversed thermo-switchable molecular sieving membranes composed of two-dimensional metal-organic nanosheets for gas separation journal February 2017
Tailoring exciton and excimer emission in an exfoliated ultrathin 2D metal-organic framework journal June 2018
Transforming ground mica into high-performance biomimetic polymeric mica film journal July 2018
Enhanced photocatalytic hydrogen evolution from in situ formation of few-layered MoS 2 /CdS nanosheet-based van der Waals heterostructures journal January 2017
Taming electronic properties of boron nitride nanosheets as metal-free catalysts for aerobic oxidative desulfurization of fuels journal January 2018
Fabrication of covalently linked exfoliated boron nitride nanosheet/multi-walled carbon nanotube hybrid particles for thermal conductive composite materials journal January 2018
Dynamic tungsten diselenide nanomaterials: supramolecular assembly-induced structural transition over exfoliated two-dimensional nanosheets journal January 2018
Highly thermally conductive flame retardant epoxy nanocomposites with multifunctional ionic liquid flame retardant-functionalized boron nitride nanosheets journal January 2018
Rapid synthesis of ultrathin 2D materials through liquid-nitrogen and microwave treatments journal January 2019
Gas-driven exfoliation for producing high-quality graphene journal January 2019
Electrochemically induced crystallization of amorphous materials in molten MgCl 2 : boron nitride and hard carbon journal January 2020
Molten salt assisted assembly growth of atomically thin boron carbon nitride nanosheets for photocatalytic H 2 evolution journal January 2020
The mechanism of thiophene oxidation on metal-free two-dimensional hexagonal boron nitride journal January 2019
Ultrathin metal/covalent–organic framework membranes towards ultimate separation journal January 2019
Microwave-assisted depolymerization of various types of waste lignins over two-dimensional CuO/BCN catalysts journal January 2020
Recent advances in exfoliation techniques of layered and non-layered materials for energy conversion and storage journal January 2019
Environmentally friendly, scalable exfoliation for few-layered hexagonal boron nitride nanosheets (BNNSs) by multi-time thermal expansion based on released gases journal January 2019
High-yield synthesis of extremely high concentrated and few-layered boron nitride nanosheet dispersions journal August 2018
Scalable exfoliation and gradable separation of boric-acid-functionalized boron nitride nanosheets journal April 2019
Surface modification of boron nitride nanosheets by polyelectrolytes via atom transfer radical polymerization journal April 2018
High yield and concentration exfoliation of defect-free 2D nanosheets via gentle water freezing-thawing approach and stabilization with PVP journal September 2019
A Non-Van der Waals two dimensional material from microwave synthesized Cu 2 ZnSnS 4 nanocrystal agglomerates journal September 2019
Exfoliation of Hexagonal Boron Nitride (h-BN) in Liquide Phase by Ion Intercalation journal September 2018
Tuning the Chemical Hardness of Boron Nitride Nanosheets by Doping Carbon for Enhanced Adsorption Capacity journal September 2017
A water-based green approach to large-scale production of aqueous compatible graphene nanoplatelets journal April 2018