28 research outputs found
Prediction of a Novel 2D Porous Boron Nitride Material with Excellent Electronic, Optical and Catalytic Properties
Holey graphyne (HGY) is a recently synthesized two-dimensional semiconducting
allotrope of carbon composed of a regular pattern of six and eight-vertex
carbon rings. In this study, based on first-principles density functional
theory and molecular dynamics simulations, we predict a similar stable porous
boron nitride holey graphyne-like structure that we call BN-holey-graphyne
(BN-HGY). The dynamical and thermal stability of the structure at room
temperature is confirmed by performing calculations of the phonon dispersion
relations, and also ab-initio molecular dynamics simulations. BN-HGY structure
has a wide direct bandgap of 5.18 eV, which can be controllably tuned by
substituting carbon, aluminum, silicon, and phosphorus atom in place of sp and
sp hybridized boron and nitrogen atoms of BN-HGY. We have also calculated
the optical properties of the HGY and BN-HGY structures for the first time and
found that the optical absorption spectra of these structures span full visible
and a wide range of ultraviolet regions. We have found that the Gibbs free
energy of the BN-HGY structure for the hydrogen adsorption process is very
close to zero (-0.04 eV) and, therefore, the BN-HGY structure can be utilized
as a potential catalyst for HER. Therefore, we propose that the boron nitride
analog of holey graphyne can be synthesized and that it has a wide range of
applications in nanoelectronics, optoelectronics, spintronics, ultraviolet
laser, and solar cell devices.Comment: main text (33 pages, 12 figures), supporting information (10 pages, 5
figures
Enhancing the ultrafast third order nonlinear optical response by charge transfer in VSe2-reduced graphene oxide hybrid
Nonlinear optical phenomena play a critical role in understanding microscopic
light-matter interactions and have far-reaching applications across various
fields, such as biosensing, quantum information, optical switching, and
all-optical data processing. Most of these applications require materials with
high third-order absorptive and refractive optical nonlinearities. However,
most materials show weak nonlinear optical responses due to their perturbative
nature and often need to be improved for practical applications. Here, we
demonstrate that the charge donor-acceptor hybrid of VSe2-reduced graphene
oxide (rGO) hybrid exhibits enhanced ultrafast third-order absorptive and
refractive nonlinearities compared to the pristine systems, at least by one
order of magnitude. Through density functional theory and Bader charge
analysis, we elucidate the strong electronic coupling in the VSe2-rGO hybrid,
involving the transfer of electrons from VSe2 to rGO. Steady-state and
time-resolved photoluminescence (PL) measurements confirm the electronic
coupling and charge transfer. Furthermore, we fabricate an ultrafast optical
limiter device with better performance parameters, such as an onset threshold
of 2.5 mJ cm-2 and differential transmittance of 0.42
Erratum to: 36th International Symposium on Intensive Care and Emergency Medicine
[This corrects the article DOI: 10.1186/s13054-016-1208-6.]
Optical absorption spectra of boron clusters
Boron nano-clusters of various shapes and sizes have potential applications as
scintillating detector and hydrogen storage material. Using time dependent density
functional theory (TDDFT) as implemented in CASIDA we have studied the linear optical
absorption spectra for boron clusters Bn (n = 2–5) and compared with
previously reported results using Hatree-Fock (H-F) based method where the spectrum is
limited to 8 eV due to exclusion of excitation into very high energy unoccupied orbital.
The optical spectra fall in the visible and near UV region and are very much dependent on
the shape of the isomer. We have obtained additional peaks for B2 linear, B3 triangular, B4 rhombus and square shaped
isomers beyond 8 eV which were missing in the previous H-F based study and has
significance as they fall below the ionization potential. We correlate the optical
spectrum with the shape of the Kohn-Sham orbitals and HUMO-LUMO gap and assess comparative
stability of various Bn (n = 2–5) clusters in terms
of HUMO-LUMO gap, bond-length and relative energy. TDDFT computed optical spectroscopy
correlated with Kohn-Sham orbitals and HUMO-LUMO gap and its comparison with H-F based
method may give significant knowledge regarding geometry and optical properties of
Bn (n = 2–5) clusters enabling
to distingush between various isomers of Bn clusters
Maxwell-Stefan Diffusion And Dynamical Correlation In Molten LiF-KF: A Molecular Dynamics Study
In this work our main objective is to compute Dynamical correlations, Onsager coefficients and Maxwell-Stefan (MS) diffusivities for molten salt LiF-KF mixture at various thermodynamic states through Green-Kubo formalism for the first time. The equilibrium molecular dynamics (MD) simulations were performed using BHM potential for LiF-KF mixture. The velocity autocorrelations functions involving Li ions reflect the endurance of cage dynamics or backscattering with temperature. The magnitude of Onsager coefficients for all pairs increases with increase in temperature. Interestingly most of the Onsager coefficients has almost maximum magnitude at the eutectic composition indicating the most dynamic character of the eutectic mixture. MS diffusivity hence diffusion for all ion pairs increases in the system with increasing temperature. Smooth variation of the diffusivity values denies any network formation in the mixture. Also, the striking feature is the noticeable concentration dependence of MS diffusivity between cation-cation pair, DLi-K which remains negative for most of the concentration range but changes sign to become positive for higher LiF concentration. The negative MS diffusivity is acceptable as it satisfies the non-negative entropy constraint governed by 2nd law of thermodynamics. This high diffusivity also vouches the candidature of molten salt as a coolant
First principles DFT investigation Of Yttrium-decorated Boron-Nitride Nanotube: Electronic Structure and Hydrogen Storage
The electronic structure and hydrogen storage capability of Yttrium-doped BNNTs has been theoretically investigated using first principles density functional theory (DFT). Yttrium atom prefers the hollow site in the center of the hexagonal ring with a binding energy of 0.8048eV. Decorating by Y makes the system half-metallic and magnetic with a magnetic moment of 1.0 mu(B). Y decorated Boron-Nitride (8,0) nanotube can adsorb up to five hydrogen molecules whose average binding energy is computed as 0.5044eV. All the hydrogen molecules are adsorbed with an average desorption temperature of 644.708 K. Taking that the Y atoms can be placed only in alternate hexagons, the implied wt% comes out to be 5.31%, a relatively acceptable value for hydrogen storage materials. Thus, this system can serve as potential hydrogen storage medium