Theoretical and Experimental Studies of the Optical Properties of Conjoined Gold−Palladium Nanospheres

2010 ◽  
Vol 114 (49) ◽  
pp. 21247-21251 ◽  
Author(s):  
Andrew J. Logsdail ◽  
Nikki J. Cookson ◽  
Sarah L. Horswell ◽  
Z. W. Wang ◽  
Z. Y. Li ◽  
...  
Keyword(s):  
Optical Properties ◽  
Experimental Studies

Band structures and optical properties of Al-doped α-Si 3 N 4 : theoretical and experimental studies

2016 ◽  
Vol 42 (2) ◽  
pp. 3681-3686 ◽  
Author(s):  
Zhifeng Huang ◽  
Zhihao Wang ◽  
Fei Chen ◽  
Qiang Shen ◽  
Lianmeng Zhang
Keyword(s):  
Optical Properties ◽  
Experimental Studies ◽  
Band Structures

scholarly journals Structure and Optical Properties of B'- Phase of Ag8SnSe6

2016 ◽  
Vol 17 (3) ◽  
pp. 346-349
Author(s):  
І.V. Semkiv
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Absorption Spectrum ◽  
Optical Absorption ◽  
Experimental Studies ◽  
Energy Dispersive Spectrum ◽  
Energy Dispersive ◽  
Interatomic Distances ◽  
X Ray ◽  
Good Agreement

Energy dispersive x-ray spectroscopy of lowtemperature b¢-Ag8SnSe6 crystalcarried out. Energy dispersive spectrum shows only peaks related to Ag8SnSe6. Experimental optical absorption spectrum and band gap value 0.82 eV are determined. Theoretical calculation of absorption spectrum shows good agreement with experimental studies. Modeling of crystal structure of Ag8SnSe6 argyrodite and interatomic distances calculation are carried out.

scholarly journals Carbon Nanoparticles. Production, properties, perspectives of use

2020 ◽  
Vol 21 (1) ◽  
pp. 13-18
Author(s):  
P. P. Maksimyak ◽  
C. Yu. Zenkova ◽  
V. M. Tkachuk
Keyword(s):  
Optical Properties ◽  
Carbon Nanoparticles ◽  
Carbon Nanostructures ◽  
Experimental Studies ◽  
Optimal Conditions ◽  
Blue Region ◽  
The Creation

The paper is devoted to the study of the optical properties of carbon nanoparticles synthesized by the method developed during our experimental studies. The optimal conditions for the creation of carbon nanostructures with predetermined properties are defined. Nanoparticles of the size of about 100 nm were obtained, the maximum of absorption of which is localized at wavelengths in the violet-blue region of the spectrum, while the maximum of luminescence – in the green region of the spectrum. The assumption is made about the possibility of using the obtained particles for correlation diagnostics of optical speckle fields.

scholarly journals Structural, Electronic and Optical Properties of Cubic Perovskite Cspbx3 (X= Br, Cl and I)

2020 ◽  
Vol 8 (1) ◽  
pp. 23-28
Author(s):  
Aawzad A. Abdulkareem ◽  
Sarkawt A. Sami ◽  
Badal H. Elias
Keyword(s):  
Optical Properties ◽  
Density Functional ◽  
Structural Parameters ◽  
Plane Waves ◽  
Experimental Studies ◽  
Visible Region ◽  
Electromagnetic Spectrum ◽  
Generalized Gradient ◽  
Electronic And Optical Properties ◽  
Low Energies

Plane waves with norm conserving pseudopotentials (PW-PP) method in conjunction with density functional theory (DFT) frame work have been used to investigate structural, electronic and optical properties of lead-halide cubic perovskite CsPbX3 (X=Br, Cl and I). The generalized gradient approximation (GGA), specifically Perdew-Burke-Ernzerhof (PBE) flavor, has been chosen to treat the exchange correlation term of Kohn-Sham equation. Structural parameters are comparable with other theoretical and experimental studies. In spite of good agreement of our band gap values  with other theoretical works, however, they were not comparable when compared to the experimental  values due to the well-known problem of Eg value underestimation of DFT. To update the  value, we have used GW method as a self-consistent quasiparticle method on energies and wave functions and indeed they have been improved. Optical properties have been calculated using density functional perturbation theory (DFPT). Our results show that CsPbX3 (X=Br, Cl, I) has maximum response to the electromagnetic spectrum at low energies (visible region) but minimum response at high energies.

Experimental Studies on the Classification of Airborne Particles Based on Their Optical Properties

2018 ◽  
Vol 39 (3) ◽  
pp. 369-374 ◽  
Author(s):  
Kibong Choi ◽  
Young Jin Koh ◽  
Young-Su Jeong ◽  
Eugene Chong
Keyword(s):  
Optical Properties ◽  
Experimental Studies ◽  
Airborne Particles

THEORETICAL AND EXPERIMENTAL STUDIES ON SILOXENE

1993 ◽  
Vol 07 (21) ◽  
pp. 1343-1364 ◽  
Author(s):  
P. DEÁK ◽  
M. STUTZMANN ◽  
M. S. BRANDT ◽  
M. ROSENBAUER ◽  
S. FINKBEINER ◽  
...  
Keyword(s):  
Experimental Data ◽  
Optical Properties ◽  
Magnetic Resonance ◽  
Quantum Chemical ◽  
Experimental Studies ◽  
X Ray Diffraction ◽  
Absorption Coefficients ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Equilibrium Structures

Structural and optical properties of siloxene ( Si 6 O 3 H 6) and its derivatives obtained by chemical substitution or annealing are reviewed. The preparation of siloxene is briefly described and results of x-ray diffraction and infrared absorption are shown. The equilibrium structures of stoichiometric siloxene and the electronic properties of the corresponding 2, 1, and 0-dimensional Si-clusters are obtained from quantum chemical calculations and compared to other calculations. Experimental results concerning luminescence, luminescence excitation, absorption coefficients, magnetic resonance, and stability are presented. The origin of the optical properties of siloxene is discussed based on the accumulated experimental data and on the results of theoretical modeling.

Synthesis Structural and Optical Properties of CMC/MgO Nanocomposites

2021 ◽  
Vol 1039 ◽  
pp. 104-114
Author(s):  
Yaqoob M. Jawad ◽  
Mahasin F. Hadi Al-Kadhemy ◽  
Jehan Abdul Sattar Salman
Keyword(s):  
Optical Properties ◽  
Energy Gap ◽  
Experimental Studies ◽  
Polymer Nanocomposite ◽  
Nanocomposite Films ◽  
Structural And Optical Properties ◽  
Covalent Bonds ◽  
Magnesium Oxide Nanoparticles ◽  
Xrd Study ◽  
Method Of Solution

Nanocomposites were prepared by the method of solution casting with different proportions of magnesium oxide nanoparticles (0, 1, 3, 5, 7 and 9) wt%. The structural and optical properties of nanocomposites of CMC/MgO have been studied. It was well known that the increased content of MgONPs in the method contributes to the peaks of MgONPs being completely integrated and/or disappearing within the CMC diffraction halos in the experimental results of XRD study. The differences in the XRD spectrum indicate that doping with nanoparticles induced a disparity in the microstructure of the polymer. Nanocomposite film scanning electron microscopy (SEM) reveals that MgONPs appear to form aggregates and scatter well in (CMC/MgO) nanocomposite films and at apply 9 wt. It forms a continuous network within the polymer for the percentage of MgONPs to (CMC) polymer. FTIR spectrum revealed the MgONPs has no destructive influence on the polymer structure as no covalent bonds formed between CMC and MgONPs. The optical properties of CMC/MgO nanocomposites were measured in wavelength range (200–900) nm. Experimental studies have shown that the absorbance, absorption coefficient, extinction coefficient, refractive index, actual and imaginary dielectric constant of CMC polymer is improved with an increase in concentrations of MgONPs in nanocomposites. The transmittance and energy gap of CMC polymer are decreased with the increase in the concentrations of MgONPs.

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