Correlation between the electrochemical synthesis conditions and the optical properties of polypyrrole

1997 ◽  
Vol 84 (1-3) ◽  
pp. 825-826 ◽  
Author(s):  
R. Turcu ◽  
M. Brie ◽  
G. Leising ◽  
A. Niko ◽  
V. Tosa ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electrochemical Synthesis ◽  
Synthesis Conditions

scholarly journals Equilibrium electrochemical synthesis diagrams of systems, forming homogeneous alloys and compounds

2003 ◽  
Vol 39 (1-2) ◽  
pp. 383-405 ◽  
Author(s):  
G. Kaptay
Keyword(s):  
Thermodynamic Parameter ◽  
Electrochemical Synthesis ◽  
Equilibrium Phase ◽  
Equilibrium Composition ◽  
Alloy Formation ◽  
Fixed Temperature ◽  
Synthesis Conditions ◽  
Melt Composition ◽  
Alloys And Compounds ◽  
Non Equilibrium

In the present paper thermodynamic limitations will be derived and summarized in the form of Equilibrium Electrochemical Synthesis (EES) diagrams, in order to predict the composition of the equilibrium phase, synthesized by galvanostatic co-deposition of components on inert electrodes. As a thermodynamic parameter, a difference of deposition potentials of pure components ( ?E) on inert cathodes is used (this parameter is a function of melt composition and temperature). Generally, the EES diagram predicts the equilibrium composition of the alloy as function temperature and ?E. However, for systems with homogeneous alloy formation the composition- ?E diagrams, drawn at a fixed temperature are more informative. As examples EES diagrams are constructed for the liquid Mg-Nd alloy, for some A(III)-B(V) (where A = Al, Ga, In and B = As, Sb), Si-C and for the Al-Ti system. For the Al-rich part of the Al-Ti system, also a semi-schematic non-equilibrium ES diagram is constructed. Based on these diagrams, the synthesis conditions of various phases has been discussed.

scholarly journals Synthesis conditions influencing formation of MAPbBr3 perovskite nanoparticles prepared by the ligand-assisted precipitation method

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Anna Jancik Prochazkova ◽  
Markus Clark Scharber ◽  
Cigdem Yumusak ◽  
Ján Jančík ◽  
Jiří Másilko ◽  
...  
Keyword(s):  
Optical Properties ◽  
Colloidal Stability ◽  
Precursor Solution ◽  
Solvent System ◽  
Precipitation Method ◽  
Colloidal Solutions ◽  
Capping Agents ◽  
Synthesis Conditions ◽  
Perovskite Nanoparticles ◽  
Selection Of

Abstract This work reports on an optimized procedure to synthesize methylammonium bromide perovskite nanoparticles. The ligand-assisted precipitation synthetic pathway for preparing nanoparticles is a cost-effective and promising method due to its ease of scalability, affordable equipment requirements and convenient operational temperatures. Nevertheless, there are several parameters that influence the resulting optical properties of the final nanomaterials. Here, the influence of the choice of solvent system, capping agents, temperature during precipitation and ratios of precursor chemicals is described, among other factors. Moreover, the colloidal stability and stability of the precursor solution is studied. All of the above-mentioned parameters were observed to strongly affect the resulting optical properties of the colloidal solutions. Various solvents, dispersion media, and selection of capping agents affected the formation of the perovskite structure, and thus qualitative and quantitative optimization of the synthetic procedure conditions resulted in nanoparticles of different dimensions and optical properties. The emission maxima of the nanoparticles were in the 508–519 nm range due to quantum confinement, as confirmed by transmission electron microscopy. This detailed study allows the selection of the best optimal conditions when using the ligand-assisted precipitation method as a powerful tool to fine-tune nanostructured perovskite features targeted for specific applications.

scholarly journals NaYF4 Microstructure, beyond Their Well-Shaped Morphology

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1560
Author(s):  
Godefroy Leménager ◽  
Sandrine Tusseau-Nenez ◽  
Maud Thiriet ◽  
Pierre-Eugène Coulon ◽  
Khalid Lahlil ◽  
...  
Keyword(s):  
Optical Properties ◽  
Local Symmetry ◽  
Xrd Analysis ◽  
Lanthanide Ions ◽  
Strong Variation ◽  
Emission Analysis ◽  
Synthesis Conditions ◽  
Polarized Emission ◽  
Local Deviation ◽  
Crystalline Symmetry

Lanthanide-doped nanoparticles are widely investigated for their optical properties. However, the sensitivity of the lanthanide ions’ luminescence to the local symmetry, useful when investigating structural environments, becomes a drawback for optimized properties in the case of poorly controlled crystallinity. In this paper, we focus on β -NaYF4 nanorods in order to provide a detailed description of their chemical composition and microstructure. The combination of detailed XRD analysis and TEM observations show that strong variation may be observed from particles from a same batch of synthesis, but also when considering small variations of synthesis conditions. Moreover, also the nanorods observed by SEM exhibit a very nice faceted shape, they are far from being monocrystalline and present significant local deviation of crystalline symmetry and orientation. All these structural considerations, sensitively probed by polarized emission analysis, are crucial to analyze for the development of optimal systems toward the targeted applications.

scholarly journals Electrochemical synthesis and optical properties of ultra-fine CdSe nanoparticles

2016 ◽  
Vol 6 (4) ◽  
pp. 289-297 ◽  
Author(s):  
S. S. Fomanyuk ◽  
V. N. Asaula ◽  
G. Ya Kolbasov ◽  
T. A. Mirnaya
Keyword(s):  
Optical Properties ◽  
Electrochemical Synthesis ◽  
Cdse Nanoparticles

scholarly journals THE OPTICAL PROPERTIES OF MULTILAYER PERIODIC STRUCTURES BaTiO3:Eu/SiO2

Doklady BGUIR ◽  
2019 ◽  
pp. 95-100
Author(s):  
D. A. Parafinyuk ◽  
N. V. Gaponenko ◽  
T. F. Raichenok
Keyword(s):  
Optical Properties ◽  
Periodic Structures ◽  
Photonic Band Gap ◽  
Bragg Reflector ◽  
Wavelength Shift ◽  
Excitation Spectra ◽  
Synthesis Conditions ◽  
Long Wavelength ◽  
Kinetics Of ◽  
Photonic Band

This paper presents the study of the optical properties of multilayer periodic structures, such as Bragg reflector, with different synthesis conditions. Transmission, reflection, luminescence, luminescence excitation spectra and kinetics of luminescence are presented for the Bragg reflectors formed on quartz with 6 and 12 alternating layers BaTiO3:Eu/SiO2. The structures demonstrate photonic band gap and its long wavelength shift with increasing number of layers. Europium luminescence with the most intensive band at 615 nm is observed from the structures. A decrease in the luminescence intensity with increasing the number of pairs of the layers in the structure is observed.

Electrochemical synthesis, optical properties and morphological characterization of ZnO/Poly( N -PhMI- co -HEMA) nanocomposite

2017 ◽  
Vol 799 ◽  
pp. 358-362 ◽  
Author(s):  
Diego P. Oyarzún ◽  
Alejandra Tello ◽  
Guadalupe del C. Pizarro ◽  
Rudy Martin-Trasanco ◽  
César Zúñiga ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electrochemical Synthesis ◽  
Morphological Characterization
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