Introduction of Protonated Sites on Exfoliated, Large-Area Sheets of Hexagonal Boron Nitride

ACS Nano
Kabeer JasujaVikas Berry

Abstract

Hexagonal boron nitride (h-BN) sheets possess an exclusive set of properties, including wide energy band gap, high optical transparency, high dielectric breakdown strength, high thermal conductivity, UV cathodoluminescence, and pronounced thermochemical stability. However, functionalization of large h-BN layers has remained a challenge due to their chemical resistance and unavailable molecular-binding sites. Here we report on the protonation of h-BN via treatment with chlorosulfonic acid that not only exfoliates "large" h-BNs (up to 10 000 μm2) at high yields (∼23%) but also results in their covalent functionalization by introducing four forms of aminated nitrogen (N) sites within the h-BN lattice: sp2-delocalized and sp3-quaternary protonation on internal N sites (>N+═ and >NH+-) and pyridinic-like protonation on the edge N sites (═NH+- and -NH-). The presence of these groups transforms the chemically passive h-BN sheets to their chemically active form, which as demonstrated here can be used as scaffolds for forming composites with plasmonic gold nanoparticles and organic dye molecules. The dispersion of h-BNs exhibits an optical energy band gap of 5.74 eV and a zeta potential of ζ = +36.25 mV at pH = 6.1 (ζmax = +150 mV), con...Continue Reading

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Citations

Jan 28, 2021·ACS Applied Materials & Interfaces·Jasneet KaurHadis Zarrin
Feb 16, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Wen-Qiang XieYu-Jun Zhao
Oct 10, 2021·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Mohammed J MezianiYa-Ping Sun

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