title: Synthesis of wafer-scale hexagonal boron nitride monolayers free of aminoborane nanoparticles by chemical vapor deposition.
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.
authors.affiliation: School of Integrated Technology, Yonsei University, Songdo-dong, Yeonsu-gu, Incheon 406-840, Korea. Yonsei Institute of Convergence Technology, Yonsei University, Songdo-dong, Yeonsu-gu, Incheon 406-840, Korea.
authors.forename: Jaehyun
authors.initials: J
authors.lastname: Han
authors.forename: Jun-Young
authors.initials: JY
authors.lastname: Lee
authors.forename: Heemin
authors.initials: H
authors.lastname: Kwon
authors.forename: Jong-Souk
authors.initials: JS
authors.lastname: Yeo