Physicochemical Properties of Calcium Phosphate–Chitosan Composites and Scaffolds

Ultralow thermal conductivity of turbostratically disordered MoSe2 ultra-thin films and implications for heterostructures

“…The a-axis lattice parameters of the different MoSe 2 films were determined using LaBail fits of the diffraction patterns. The value obtained, 0.331(1) nm, agrees with literature values for MoSe 2 , which range from 0.329 nm for MoSe 2 prepared at high temperature [54][55][56][57] to as low as 3.22 for films prepared at low temperature [7]. The Debye-Scherrer equation was used with line widths obtained from the LaBail fits to obtain an estimate of 10 nm for the in-plane grain sizes [64].…”

“…The line widths of the reflections broaden as the number of layers decreases and the coherence length becomes limited by the film thickness. c-axis lattice parameters were calculated for the different samples (see table 1), yielding an average value of 0.6531(2) nm, which is larger than the individual layer thicknesses calculated from previously reported c-axis lattice parameters (0.646(1) nm) for 2H, 3R, or 4H MoSe 2 prepared by high temperature syntheses [53][54][55][56][57]. We believe that this increased thickness per MoSe 2 trilayer is a consequence of the rotational disorder between adjacent MoSe 2 layers.…”

“…Specular x-ray diffraction (XRD) analysis indicates that the films are crystallographically aligned to the substrate and uniform in thickness over a large area (∼2 cm × 2 cm). The spacing between MoSe 2 layers (0.6531 (2) nm) is larger than that reported for the crystalline polymorphs (∼0.646(1) nm) for 2H, 3R, or 4H MoSe 2 ) [53][54][55][56][57].…”

Magnetism between magnetic adatoms on monolayer NbSe2

“…The magnetic adatoms addressed in our study were Cr, Mn, Fe, and Co. A vacuum region of 14 Å was considered between two monolayers in the adjacent supercells along the z-direction to eliminate any unphysical inter-layer interactions. The inplane lattice constant was fixed to the experimental value of 3.45 Å corresponding to the NbSe 2 unit cell [53]. The internal positions of the atoms were optimized towards the minimum energy configuration until the forces were found to be less than 10 −3 eV Å −1 .…”