Let G be a graph, u be a vertex of G, and B(u)(or BG(u)) be the set of u with all its neighbors in G. A sequence (B1, B2, ..., Bn) of subsets of an n-set S is a neighborhood sequence if there exists a graph G with a vertex set S and a permutation (v1, v2, ..., vn) of S such that B(vi) = Bi for i = 1, 2, ..., n. Define Aut(B1, B2, ..., Bn) as the set {f : f is a permutation of V (G) and (f(B1), ...

Rhombohedral dense forms of carbon, rh-C2 (or hexagonal h-C6), and boron nitride, rh-BN h-B3N3), are derived from rhombohedral 3R graphite based on original crystal chemistry scheme backed with full cell geometry optimization to minimal energy ground state computations within the quantum density functional theory. Considering throughout settings featuring extended lattices, calculation set elas...

The interesting properties of hexagonal boron nitride (h-BN) and its potential uses in thermo-structural advanced applications have been limited or restricted by inherent brittleness, which can easily be eliminated fibers nanoscale dimensions. current study is based on the synthesis 10B-enriched h-BN (10BNNFs) from 10B precursors instead B two-hour annealing at 900 °C one-hour growth 1000 °C. A...

Monolayer hexagonal boron–nitrogen–carbon (h-BNC) is considered a prominent candidate for the next generation of semiconductor electronic devices. Nevertheless, experimental evidence h-BNC formation limited, including detailed study its morphological and properties. Here, successful growth from an unexplored single molecular precursor (hexamethyl borazine, C6H18B3N3) using conventional CVD appr...

We report the achievement of highly efficient B enriched hexagonal boron nitride (h-BN) direct conversion neutron detectors. These detectors were realized from freestanding 4-in. diameter h-BN wafers 43 lm in thickness obtained from epitaxy growth and subsequent mechanical separation from sapphire substrates. Both sides of the film were subjected to ohmic contact deposition to form a simple ver...

Ultrafast optical-phonon dynamics and the related nonlinear lattice response of few-layer hexagonal boron nitride ($h$-BN) are elucidated in a combined experimental theoretical study. The lifetimes transverse optical (TO) phonons interlayer modes 1.2 20 ps. In-plane TO phonon displacements shown to couple shear breathing motions. In response, transient reduction frequency arises from this anhar...

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Fabian Schulz Name of the doctoral dissertation Ultra-thin insulating layers of hexagonal boron nitride for high-resolution scanning tunneling spectroscopy Publisher School of Science Unit Department of Applied Physics Series Aalto University publication series DOCTORAL DISSERTATIONS 163/2016 Field of research Manuscript submi...

We study hydrogen chemisorption at full coverage and low concentrations on hexagonal boron nitride (h-BN). Chemisorption trends reveal the complex nature of hydrogenation. Barriers for diffusion are found to be significantly altered by the presence of additional H atoms. Moreover, the presence of a Stone-Wales defect may dramatically enhance the bond strength of H to the h-BN surface. These fin...