A new
method for exfoliation of hexagonal boron nitride (h-BN)
into few-layered nanosheets has been developed by employing noncovalent
assembly of networks upon association with a supramolecular polymer.
In this work, we developed a simple, reliable, effective approach
for preparation of exfoliated h-BN nanosheets from bulk h-BN via liquid-phase
exfoliation using a low-molecular weight adenine-functionalized polypropylene
glycol (A-PPG) supramolecular polymer. A-PPG self-assembled into either
long-range ordered lamellar or micelle-like structures on the surface
of h-BN because of the strong specific interactions between A-PPG
and h-BN. The level of h-BN nanosheet exfoliation could be controlled
by adjusting the amount of A-PPG incorporated. This newly developed
composite exhibited excellent phase transition behavior and thermal
stability, and few-layer thickness with good dispersion of h-BN nanosheets,
indicating self-assembled A-PPG functions as an efficient dispersant
and stabilizer to manipulate the physical and morphological properties
of exfoliated h-BN. This method of producing multifunctional exfoliated
h-BN provides a unique paradigm for developing the next generation
of thermoconductive devices and solution-processed semiconductors.
A ureido-cytosine-functionalized supramolecular polymer can be manipulated to control nano-scale microstructures and its ability to form long-range order during self-assembly.
Adenine-functionalized supramolecular micelles are rapidly endocytosed by cancer cells and enable selective induction of tumor cell death, without harming normal cells.
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