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  • Title: Synthesis of wafer-scale hexagonal boron nitride monolayers free of aminoborane nanoparticles by chemical vapor deposition.
    Author: Han J, Lee JY, Kwon H, Yeo JS.
    Journal: Nanotechnology; 2014 Apr 11; 25(14):145604. PubMed ID: 24633210.
    Abstract:
    Hexagonal boron nitride (h-BN) has gained great attention as a two-dimensional material, along with graphene. In this work, high-quality h-BN monolayers were grown in wafer scale (7 × 7 cm(2)) on Cu substrates by using low-pressure chemical vapor deposition (LPCVD). We created h-BN monolayers that were free of polymeric aminoborane (BH2NH2) nanoparticles, which are undesirable by-products of the ammonia borane precursor, by employing a simple filtering system in the CVD process. The optical band gap of 6.06 eV and sharp and symmetric Raman peak measured at 1371 cm(-1) indicate the synthesis of monolayer h-BN. In addition, spherical aberration (CS)-corrected high-resolution transmission electron microscopic images confirm the production of a single-layer hexagonal array of boron and nitrogen atoms.
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