scholarly journals Formation and Characterization ofTiO2/CNTNanomaterials Dried under Supergravity Conditions

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Minerva Vargas ◽  
Marina E. Rincón ◽  
Eduardo Ramos
Keyword(s):  
Optical Properties ◽  
Chemical Method ◽  
Bond Number ◽  
Red Shift ◽  
Gravity Force ◽  
Bilayer Film ◽  
Water Molecules ◽  
Layer By Layer ◽  
Terrestrial Gravity ◽  
Layer Solution

The elaboration of bilayerTiO2/CNTfilms dried under terrestrial gravity conditions (g) and on a centrifuge with 1.3gand 7gis reported. The changes in microstructure and thickness of these coatings under supergravity environment cause a red-shift tendency in the optical properties at increasing values of acceleration. Experiments of a drop under enhanced gravity force in the range of 3.7 < Bo (bond number) < 51.5 suggest the incomplete elimination of surfactant-water molecules in theTiO2/CNTbilayer film. Increasing acceleration up to 14gwill widen the optical differences found, proving the layer-by-layer solution-chemical method in combination with these drying protocols, an alternative to produce thickness-sensitive solar-selective absorbing coatings.

Structural and optical properties of layer-by-layer solution deposited Cu2SnS3 films

2014 ◽  
Vol 25 (9) ◽  
pp. 3687-3694 ◽  
Author(s):  
Devendra Tiwari ◽  
Tapas K. Chaudhuri ◽  
T. Shripathi ◽  
U. Deshpande ◽  
V. G. Sathe
Keyword(s):  
Optical Properties ◽  
Layer By Layer ◽  
Structural And Optical Properties ◽  
Layer Solution

Electronic Structure and Optical Properties of Non-Metals (N, F, P, Cl, S)-Doped Cubic NaTaO3 by Density Functional Theory

2009 ◽  
Vol 79-82 ◽  
pp. 1245-1248 ◽  
Author(s):  
Pei Lin Han ◽  
Xiao Jing Wang ◽  
Yan Hong Zhao ◽  
Chang He Tang
Keyword(s):  
Density Functional Theory ◽  
Optical Properties ◽  
Electronic Structure ◽  
Visible Light ◽  
Absorption Edge ◽  
Density Functional ◽  
Red Shift ◽  
Functional Theory ◽  
Photoactive Materials ◽  
Metal Doped

Electronic structure and optical properties of non-metals (N, S, F, P, Cl) -doped cubic NaTaO3 were investigated systematically by density functional theory (DFT). The results showed that the substitution of (N, S, P, Cl) for O in NaTaO3 was effective in narrowing the band-gap relative to the F-doped NaTaO3. The larger red shift of the absorption edge and the higher visible light absorption at about 520 nm were found for the (N and P)-doped NaTaO3. The excitation from the impurity states to the conduction band may account for the red shift of the absorption edge in an electron-deficiency non-metal doped NaTaO3. The obvious absorption in the visible light region for (N and P)-doped NaTaO3 provides an important guidance for the design and preparation of the visible light photoactive materials.

Structure and optical properties of cerium(III)-doped PbWO4 micro-crystals synthesized by a facile wet chemical method

2009 ◽  
Vol 11 (6) ◽  
pp. 1131-1136 ◽  
Author(s):  
Yan Fang ◽  
Ying Xiong ◽  
Yuanlin Zhou ◽  
Jinxiang Chen ◽  
Kaiping Song ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chemical Method ◽  
Wet Chemical Method ◽  
Wet Chemical

scholarly journals Optical properties of SixTiyCzOw composite nanopowder obtained by pulsed plasma chemical method

2018 ◽  
Vol 1115 ◽  
pp. 022029
Author(s):  
G Kholodnaya ◽  
F Konusov ◽  
R Sazonov ◽  
D Ponomarev ◽  
M Kaikanov
Keyword(s):  
Optical Properties ◽  
Chemical Method ◽  
Pulsed Plasma ◽  
Plasma Chemical

scholarly journals Optical properties of nanocrystal films: blue shifted transitions as signature of strong coupling

2020 ◽  
Vol 2 (1) ◽  
pp. 384-393
Author(s):  
Erik S. Skibinsky-Gitlin ◽  
Salvador Rodríguez-Bolívar ◽  
Marco Califano ◽  
Francisco M. Gómez-Campos
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Strong Coupling ◽  
Conduction Band ◽  
Red Shift ◽  
Nanocrystal Films ◽  
Interdot Coupling

Large blue shifts in the intra-conduction-band transitions and the red shift of the band gap absorption are both the manifestation of strong interdot coupling in the film.

Effects of Cu Dopant on Lattice and Optical Properties of ZnS Quantum Dots

2016 ◽  
Vol 16 (4) ◽  
pp. 3816-3820
Author(s):  
Lu Shuhua ◽  
Wang Aiji ◽  
Chen Tingfang ◽  
Wang Yinshu
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Quantum Dot ◽  
Blue Shift ◽  
Red Shift ◽  
Colloidal Nanocrystals ◽  
Long Tail ◽  
Low Concentrations ◽  
Cu Dopant ◽  
Cu Ions

Doped and undoped ZnS colloidal nanocrystals have drawn much attention due to their versatile applications in the fields of optoelectronics and biotechnology. In this paper, Cu doped ZnS quantum dots were synthesized via the simple thermolysis of ethylxanthate salts. The lattice and optical properties of the nanocrystals were then studied in detail. The quantum dot lattice contracted linearly between Cu concentrations of 0.2–2%, while it continued to contract more gradually as Cu concentrations were further increased from 4 to 6%, due in part to the Cu ions located on the surface of the ZnS lattice. Cu incorporation induces a long tail in absorption at long wavelengths. The PL spectrum shows a red shift at first, and then a blue shift with increases in Cu concentration. Cu doped at low concentrations (0.2–1%) enhanced the emission, while high Cu concentrations (2–6%) quenched emissions.

scholarly journals Layer-by-Layer synthesis and tunable optical properties of hybrid magnetic–plasmonic nanocomposites using short bifunctional molecular linkers

2014 ◽  
Vol 118 ◽  
pp. 99-102 ◽  
Author(s):  
Ward Brullot ◽  
Rik Strobbe ◽  
Maud Bynens ◽  
Maarten Bloemen ◽  
Pieter-Jan Demeyer ◽  
...  
Keyword(s):  
Optical Properties ◽  
Layer By Layer ◽  
Tunable Optical Properties

Direct thermal oxidization evaporation growth, structure, and optical properties of single-crystalline nanobelts of molybdenum trioxide

2007 ◽  
Vol 22 (6) ◽  
pp. 1609-1617 ◽  
Author(s):  
W.G. Chu ◽  
L.N. Zhang ◽  
H.F. Wang ◽  
Z.H. Han ◽  
D. Han ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Molybdenum Trioxide ◽  
Band Gap Energy ◽  
Diffraction Field ◽  
Large Strains ◽  
Layer By Layer ◽  
X Rays ◽  
Dislocation Configuration ◽  
Single Crystalline

Single-crystalline nanobelts of molybdenum trioxides were grown by direct thermal oxidization evaporation of metal molybdenum foils. Their structures, defects, and optical properties were investigated via x-ray diffraction, field-emission scanning electron microscopy, high-resolution transmission electron microscopy (HRTEM), atomic force microscopy, micro-Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), and ultraviolet-visible spectroscopy (UV-VIS). Single-crystalline nanobelts were identified as an orthorhombic structure with an average stoichiometry of MoO3.02analyzed by energy dispersive spectroscopy of x-rays. The length, width, and thickness of a nanobelt were determined to be parallel to the b, c, and aaxis of the MoO3unit cell, respectively. The thickness of the nanobelt increased by integer multiples of 0.5ain a layer-by-layer fashion during growth. A density of dislocations as high as about 1.2 × 1013cm−2was formed, which may be attributed to relaxation of large strains during cooling. A special dislocation configuration was observed by HRTEM, which was well reproduced by image simulations based on the proposed model. The resulting morphology of nanobelts was proposed to be governed by growth kinetics. Micro-Raman and FTIR spectra were successfully analyzed on the basis of vibration of MoO6octahedra. It was found that micro-Raman spectra were quite dependent on the size of the nanobelts. A band gap energy of 3.04 eV derived from UV-VIS measurements was observed to be red shifted relative to the previously reported experimental values, which may be due to the presence of a high density of defects.

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