Morphology and Size Dependent Optical Properties of CdS Nanostructures

2006 ◽  
Vol 6 (3) ◽  
pp. 771-776 ◽  
Author(s):  
Soumitra Kar ◽  
S. K. Panda ◽  
B. Satpati ◽  
P. V. Satyam ◽  
S. Chaudhuri
Keyword(s):  
Particle Size ◽  
Optical Properties ◽  
Aspect Ratio ◽  
Optical Absorption ◽  
Cds Nanoparticles ◽  
Solvothermal Process ◽  
Optical Absorption Spectra ◽  
Size Dependent ◽  
Cds Nanostructures ◽  
Size And Morphology

CdS nanoparticles with different sizes ranging from 2.5 nm to 300 nm and nanorods with aspect ratio ∼32 were synthesized by simple solvothermal process with a view to explore the effect of size and shape on the optical properties of these nanoforms. Solvent, temperature and the Cd source played important role in determining the morphologies and sizes of the nanocrystals. Comparative study of the optical properties of these nanoforms showed systematic changes in the optical absorption spectra with the reduction in particle size. Nanorods showed bulk like properties. Photoluminescence and Raman studies were carried out to explore the size and morphology dependent optical properties of the CdS nanoforms.

scholarly journals Электронная структура и спектры оптического поглощения золотых фуллеренов Au-=SUB=-16-=/SUB=- и Au-=SUB=-20-=/SUB=-

2019 ◽  
Vol 61 (6) ◽  
pp. 1204
Author(s):  
Г.И. Миронов
Keyword(s):  
Optical Properties ◽  
Energy Spectrum ◽  
Optical Absorption ◽  
Near Infrared ◽  
Fourier Transforms ◽  
Green Functions ◽  
Optical Absorption Spectra ◽  
New Class ◽  
Infrared Spectral ◽  
Neighboring Site

AbstractThe electronic and optical properties of gold fullerenes are studied in the framework of the Hubbard model. The expressions of the Fourier transforms of anticommutator Green functions have been obtained for gold fullerenes Au_16 and Au_20, the poles of which determine the energy spectrum of the system under consideration. The calculations are performed for the thermodynamic means that characterize jumps of electrons from a nanosystem site to a neighboring site, the correlation functions demonstrating the possibility of existing two d electrons with oppositely oriented spin projections on the same site of the fullerenes consisting of gold atoms. The optical absorption spectra are presented. The optical absorption peaks of ions $${\text{Au}}_{{20}}^{ - }$$ and $${\text{Au}}_{{16}}^{ - }$$ correspond to a near-infrared spectral region, where the light absorption by blood or a soft tissue is vanishingly small; thus, these ions can be used as a new class of contrast improvements and phototherapeutic means for diagnostics and treatment of cancer.

scholarly journals Optical properties of size selected neutral Ag clusters: electronic shell structures and the surface plasmon resonance

Nanoscale ◽  
2018 ◽  
Vol 10 (44) ◽  
pp. 20821-20827 ◽  
Author(s):  
Chongqi Yu ◽  
Romain Schira ◽  
Harald Brune ◽  
Bernd von Issendorff ◽  
Franck Rabilloud ◽  
...  
Keyword(s):  
Optical Properties ◽  
Surface Plasmon Resonance ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Shell Structures ◽  
Optical Absorption Spectra ◽  
Electronic Shell ◽  
Ag Clusters

We present optical absorption spectra from the ultraviolet to the visible for size selected neutral Agn clusters (n = 5–120) embedded in solid Ne.

Effect of Li2O and Na2O on Optical Properties of Bismuth Borate Glasses

2016 ◽  
Vol 675-676 ◽  
pp. 322-326
Author(s):  
Narong Sangwaranatee ◽  
Jakrapong Kaewkhao ◽  
Yotsakit Ruangtaweep
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Molar Volume ◽  
Absorption Spectra ◽  
Borate Glasses ◽  
Optical Absorption Spectra ◽  
Melt Quenching ◽  
Bismuth Borate ◽  
Work Effect

In this work, effect of Li2O and Na2O on bismuth borate glasses have been investigated. The glass samples were prepared in composition 44B2O3 : 50Bi2O3 : 5Li2O : 1A2O3 and 44B2O3 : 50Bi2O3 : 5Na2O3 : 1A2O3 (where A2O3= Sm2O3 and Dy2O3).Glasses were prepared using the melt-quenching technique at 1,100 oc under normal atmosphere. The result found that, the density and molar volume of lithium bismuth borate glasses are less than sodium bismuth borate glasses both in Sm2O3 and Dy2O3. In addition, the optical absorption spectra and luminescence of lithium bismuth borate glasses are higher than sodium bismuth borate glasses both in Sm2O3 and Dy2O3.

Synthesis and Electroluminescence of Silver Doped ZnS/PVK Nanocomposite

2015 ◽  
Vol 361 ◽  
pp. 231-243 ◽  
Author(s):  
Amrita Dwivedi ◽  
Nisha Dwivedi ◽  
Nitendra Gautam ◽  
Meera Ramrakhiani ◽  
P.K. Khare
Keyword(s):  
Thin Films ◽  
Particle Size ◽  
Optical Absorption ◽  
Special Functions ◽  
Morphological Characterization ◽  
Host Material ◽  
Luminescent Materials ◽  
Optical Absorption Spectra ◽  
Chemical Route ◽  
Wide Range

Sulfide based luminescent materials have attracted a lot of attention for a wide range of photo-and electroluminescence applications. Among the sulfides, ZnS is promising host material for development of phosphors in different visible emission bands. Doping of Ag can affect the electroluminescence of the host material. Incorporation of host ZnS into the polymer matrix is one of the best method to display their special functions, which stabilize the nanoparticles. Here we report a synthesis and electroluminescence of silver doped ZnS/PVK nanocomposites thin films. Reported films were prepared by using chemical route with varying Ag doping and ZnS loading in the composite. Structural and morphological characterization were carried out through XRD and SEM techniques, which confirmed the particles in nanoregime. Though optical absorption spectra and band gap of ZnS semiconductor nanoparticles in ZnS:Ag/PVK matrix were estimated, and using EMA model, particle size was calculated which supports the results of XRD. Electroluminescence of nanocomposite samples was studied and it was found that threshold voltage depends on doping of Ag and also on loading of ZnS. Voltage brightness characteristics support the production of EL by acceleration-collision mechanism.Contents of Paper

The role of dysprosium ions on the physical and optical properties of lithium-borosulfophosphate glasses

2017 ◽  
Vol 31 (13) ◽  
pp. 1750101 ◽  
Author(s):  
Ibrahim Bulus ◽  
S. A. Dalhatu ◽  
R. Hussin ◽  
W. N. Wan Shamsuri ◽  
Y. A. Yamusa
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Physical Parameters ◽  
Potential Candidate ◽  
Optical Absorption Spectra ◽  
Absorption Bands ◽  
X Ray ◽  
Nir Absorption ◽  
Optical Applications

Achieving outstanding physical and optical properties of borosulfophosphate glasses via controlled doping of rare earth ions is the key issue in the fabrication of new and highly-efficient glass material for diverse optical applications. Thus, the effect of replacing P2O5 by Dy2O3 on the physical and optical properties of Dy[Formula: see text]-doped lithium-borosulfophosphate glasses with chemical composition of 15Li2O–30B2O3–15SO3–[Formula: see text]P2O5–[Formula: see text]Dy2O3 (where 0.0 mol.% [Formula: see text] mol.%) has been investigated. The glass samples were synthesized from high-purity raw materials via convectional melt-quenching technique and characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectrometry (EDX), density and UV–vis–NIR absorption measurements. The amorphous nature of the prepared glass samples was confirmed by XRD patterns whereas the EDX spectrum depicts elemental traces of O, C, B, S, P and Dy. The physical parameters such as density, refractive index, molar volume, polaron radius and field strength were found to vary nonlinearly with increasing Dy2O3 concentration. UV–vis–NIR absorption spectra revealed seven absorption bands with most dominant peak at 1269 nm (6H[Formula: see text]F[Formula: see text]H[Formula: see text]). From the optical absorption spectra, the optical bandgap and Urbach’s energy have been determined and are related with the structural changes occurring in these glasses with increase in Dy2O3 content. Meanwhile, the bonding parameters ([Formula: see text]) evaluated from the optical absorption spectra were found to be ionic in nature. The superior features exhibited by the current glasses nominate them as potential candidate for nonlinear optical applications.

Notizen: Preparation, Structures and Optical Properties of [H3N(CH2)6NH3]BiX5 (X=I, Cl) and [H3N(CH2)6NH3]SbX5 (X=I, Br)

1998 ◽  
Vol 53 (8) ◽  
pp. 927-932 ◽  
Author(s):  
G. A. Mousdis ◽  
G. C. Papavassiliou ◽  
A. Terzis ◽  
C. P. Raptopoulou
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Crystal Structures ◽  
Absorption Spectra ◽  
Blue Shift ◽  
Optical Absorption Spectra ◽  
Absorption Bands ◽  
One Dimensional ◽  
Excitonic Absorption

Abstract The preparation, crystal structures and optical absorption spectra of [H3N(CH2)6NH3]BiX5 (X= I, Cl) and [H3N(CH2)6NH3]SbX5 (X =I, Br) are reported. The anions of the compounds consist of MX6-octahedra (M =Bi, Sb) sharing cisvertices in one-dimensional zig-zag chains. Because of their one-dimensional character, a blue shift of the excitonic absorption bands, in com parison to those of higher dim ensionality systems (MX3), is observed.

Investigation on Physical and Optical Properties of Vanadium Oxide in Soda Lime Borate Glasses

2014 ◽  
Vol 979 ◽  
pp. 135-138 ◽  
Author(s):  
Yotsakit Ruangtaweep ◽  
Jakrapong Kaewkhao
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Optical Absorption ◽  
Vanadium Oxide ◽  
Absorption Spectra ◽  
Soda Lime ◽  
Borate Glasses ◽  
Optical Absorption Spectra ◽  
Color Coordinate ◽  
Uv Visible

In this work, the physical and optical properties of soda-lime-borate glasses doped with V2O5 concentration of 0.0 to 2.5 in mol% have been investigated. The glass samples were prepared by the normal melt-quench technique. The results show that the density and refractive index decreased with additional 0.5 mol% content of V2O5. Then both results increased with increasing V2O5 content from 1.0-2.5 mol%. The optical absorption spectra of glass samples were measured by UV-visible spectrophotometer in the wavelength range 300-1100 nm and color coordinate in CIEL*a*b* system. The absorption peaks locate around 605 and 960 nm for all V2O5 concentration that are associated to V4+ ions and produce the brown color.

scholarly journals Linear-scaling density functional simulations of the effect of crystallographic structure on the electronic and optical properties of fullerene solvates

2017 ◽  
Vol 19 (7) ◽  
pp. 5617-5628 ◽  
Author(s):  
Hong-Tao Xue ◽  
Gabriele Boschetto ◽  
Michal Krompiec ◽  
Graham E. Morse ◽  
Fu-Ling Tang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Dft Calculations ◽  
Density Functional ◽  
Large Scale ◽  
Crystallographic Structure ◽  
Linear Scaling ◽  
Optical Absorption Spectra ◽  
Novel Structure ◽  
Structural And Electronic Properties

Large-scale DFT calculations of fullerene solvates including one novel structure probe, the structural and electronic properties and optical absorption spectra.

Magneto-optical properties of ABC-stacked trilayer graphene

2015 ◽  
Vol 17 (24) ◽  
pp. 15921-15927 ◽  
Author(s):  
Yi-Ping Lin ◽  
Chiun-Yan Lin ◽  
Yen-Hung Ho ◽  
Thi-Nga Do ◽  
Ming-Fa Lin
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Tight Binding ◽  
Tight Binding Model ◽  
Optical Absorption Spectra ◽  
Binding Model ◽  
Trilayer Graphene

The generalized tight-binding model is developed to investigate the magneto-optical absorption spectra of ABC-stacked trilayer graphene.

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