Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 8, Pages 7988-7994Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c01283
Keywords
molten salt; boron nitride; nanosheets; hydrogels; ammonia borane
Funding
- Australian Research Council's Future Fellowship [FT190100658]
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A new method has been developed to prepare few-layered BNNS with lateral sizes of a few microns using molten salt-assisted synthesis, producing hydroxylated BNNS after sonication in water. The functionalized BNNS as an additive can significantly improve the mechanical modulus of PU hydrogels without compromising their optical properties.
Two-dimensional hexagonal boron nitride nanosheets (BNNS) are an outstanding filler and additive, since they are transparent, thermally stable, and chemically inert. However, it is difficult to obtain few-layered BNNS with large lateral sizes in an efficient way due to the strong interlayer interactions in h-BN. Herein, a facile and efficient molten salt-assisted synthesis has been developed to prepare few-layered BNNS with a few microns in lateral size. Ammonia borane was mixed with KCl and NaCl and then heated to 1000 degrees C and held for 2 min, and the resultant powders were sonicated in water to produce hydroxylated BNNS. Used as an additive with 0.066 wt % loading, the functionalized BNNS can effectively improve the mechanical modulus of polyurethane (PU) hydrogels from 1635 to 2776 kPa, and the optical property of the hydrogel is not compromised. The BNNS-reinforced PU hydrogel with significantly improved mechanical properties can be highly useful in the application of printed electronics.
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