Synthesis, Characterization and Photocatalytic activity of Tin oxide Nano-crystals

2020 ◽  
Vol 16 ◽  
Author(s):  
Shatendra Sharma ◽  
Monika Vats ◽  
Jyotsna Sharma ◽  
Arvind Chhabra ◽  
R. K. Rakesh Kumar ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Catalytic Activity ◽  
Band Gap ◽  
Sodium Carbonate ◽  
Tin Oxide ◽  
Nano Particles ◽  
Precipitation Method ◽  
Storage Devices ◽  
Photo Catalytic Activity ◽  
Co Precipitation

Background: Tin oxide nano-particles also show good photo-catalytic efficiency because of its wide band gap and high recombination rates of photo-generated electron-hole pairs. Being non-toxic and chemically stable, the tin oxide nano-particles are used as dynamic photo-catalyst for the degradation. Tin oxide nano-crystals suitable for charge storage devices are synthesized using co-precipitation technique. Objectives: Synthesis of Tin oxide nano-crystals by using co-precipitation method for photo-catalytic activity under sunlight that can be used for photo-degradation. The method of synthesis and characterization are discussed. Materials and Methods: The nano-crystals are prepared by co-precipitation method using stannic chloride and sodium carbonate. sodium carbonate is added under constant stirring drop by drop for 90 minutes. The solution is settled for 4 hours. The precipitates are first washed using de-ionized water and then with ethyl alcohol. The dried powder of nanocrystals is then calcinated at 500oC for one hour in a muffle furnace. The structural, morphological, optical and electrical characterization of these synthesized crystals is done using (XRD), (FESEM), (TEM), (UV-Visible), (FT-Raman), Zeta potential and dielectric constant measurements. Results and Discussion: The sizes of synthesized nano-crystals vary from 25 nm to 100 nm and are found to be optically transparent. The dielectric constant of nano-crystals is measured in the frequency range of 100Hz-1MHz and it can be seen that it declines from ~2000 at frequency 100Hz to ~30 at 1MHz.However, this decline in dielectric constant with frequency can be explained well on the basis of strong space charge polarization and rotational direction polarization processes in nanostructures. In the high frequency regions, these processes cannot follow the electrical field frequency variations that results in the rapid decrease of dielectric constant. Photo-catalytic activity: The photo-catalytic activity of the particles under sun light is also investigated which shows that the crystals show degradation of the methylene blue dye under sunlight irradiation. Theoretical investigations with DFT: The band gap of the particles is also calculated from the UV-VIS spectra which is found to be ~3.6 eV and this experimentally observed value of band gap matches with that calculated theoretically from Density Functional Theory (DFT) using Local Density Approximation (LDA). Conclusion: The method of synthesis reported in the present paper is scalable and can be used for commercial synthesis of SnO2 nano-crystals for electrodes and energy storage devices.

Study on the Preparation of Nano Fe3O4 Powder and its Properties

2012 ◽  
Vol 178-181 ◽  
pp. 562-565
Author(s):  
Rui Cui Liu ◽  
Fu Yi Jiang ◽  
Zi Quan Liu
Keyword(s):  
Catalytic Activity ◽  
Rhodamine B ◽  
Catalytic Degradation ◽  
Model Reaction ◽  
Iron Chloride ◽  
Precipitation Method ◽  
Photo Catalytic Activity ◽  
Powder Samples ◽  
Nano Fe3o4 ◽  
Co Precipitation

The experiment used iron chloride, iron dichloride and other agents as the main resources to prepare the nano Fe3O4 powder by co-precipitation method. Magnets were used to test the magnetism of the prepared nano Fe3O4 powder samples. And the photo-catalytic degradation of rhodamine B solution was used as the model reaction to test the photo-catalytic activity of the prepared nano Fe3O4 powder. The results showed that the prepared nano Fe3O4 powder samples had good magnetism but low photo-catalytic activity.

Structure and Optical Properties of Quantum Confined Pure and Cu Doped SnO2

2020 ◽  
Vol 1159 ◽  
pp. 60-66
Author(s):  
J.R. Sheeba ◽  
Sathasivam Radhika ◽  
C.M. Padma
Keyword(s):  
Band Gap ◽  
Tin Oxide ◽  
Optical Band Gap ◽  
Green Emission ◽  
Precipitation Method ◽  
Rutile Structure ◽  
Tetragonal Rutile Structure ◽  
Ft Ir ◽  
Tin Oxide Nanoparticles ◽  
Co Precipitation

Pure and copper doped tin oxide nanoparticles were synthesized by co-precipitation method and are characterized by XRD, SEM, EDAX, UV-Visible, photoluminescence, and FT-IR analysis techniques. Tetragonal rutile structure is confirmed from XRD and the crystallite size is found to be between 3.8nm and 4.8nm. The optical band gap is observed from UV-Vis spectrum and is found to be 3.99eV and 3.93eV for tin oxide and copper doped tin oxide respectively. The optical band gap of pure and Copper doped tin oxide were blue shifted due to quantum confinement. Photoluminescence spectrum shows UV, blue and green emission peaks.

Preparation and Microanalysis Study of Nano-Hap/Cs-Chs Composites Materials

2012 ◽  
Vol 581-582 ◽  
pp. 463-466 ◽  
Author(s):  
Man De Qiu ◽  
Xiao Yan Wang ◽  
Yong Qing Zhai ◽  
Zi Hua Yao
Keyword(s):  
Chondroitin Sulfate ◽  
Organic Phase ◽  
Nano Particles ◽  
Precipitation Method ◽  
Composites Materials ◽  
Before And After ◽  
Calcium And Phosphorus ◽  
Co Precipitation

Nano-hydroxyapatite/chitosan-chondroitin sulfate composites materials with different weight ratios were prepared through liquid co-precipitation method. The nano-Hap、Hap/Cs and Hap/Cs-Chs composites materials under the same conditions preparation materials were researched By XRD, SEM and EDS respectively. The results show that nano-Hap particles with poorly crystallinity, the size is about 20nm, nano-Hap particles are spherical in sHape and dispersed uniformly, combined with relatively loose between particles, the small nano-particles aggregate into larger particles when the Hap composite with the Cs and Chs, nano-Hap were dispersed uniformly in the organic phase Cs and Chs, Hap particles have the trend to grow large in composites materials,crystal become more perfect, combination become relatively dense between particles, The composites materials were annealed at 700°C,Hap crystal particles become more perfect clear and larger with relatively loose between particles.EDS analysis showed that the compound before and after annealing of the material ratio of calcium had no influence, material does not contain any impurities,The ratio of calcium and phosphorus is about 1.75:1,Hap belonging to the type of calcium-rich

Composition and magnetic properties of cobalt ferrite nano-particles prepared by the co-precipitation method

2010 ◽  
Vol 322 (21) ◽  
pp. 3470-3475 ◽  
Author(s):  
Yue Zhang ◽  
Zhi Yang ◽  
Di Yin ◽  
Yong Liu ◽  
ChunLong Fei ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Cobalt Ferrite ◽  
Nano Particles ◽  
Precipitation Method ◽  
Co Precipitation

EFFECT OF SURFACTANTS ON THE SIZE, COLOR, PHOTOLUMINESCENCE AND RESISTIVITY OF INDIUM TIN OXIDE NANOPARTICLES PREPARED BY CO-PRECIPITATION METHOD

2012 ◽  
Vol 19 (05) ◽  
pp. 1250054 ◽  
Author(s):  
AYYOOB JAFARI ◽  
YADOLAH GANJKHANLOU ◽  
MAHMOOD KAZEMZAD ◽  
HAMZEH GHORBANI
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Lattice Parameter ◽  
Precipitation Method ◽  
Tin Oxide Nanoparticles ◽  
Xrd Patterns ◽  
Ito Nanoparticles ◽  
Xrd Techniques ◽  
Co Precipitation ◽  
Triton X

Indium tin oxide (ITO) nanoparticles were synthesized by co-precipitation method using ammonia as a precipitator in absence/presence of various surfactants (LABS and Triton X-100). The synthesized nanoparticles were investigated by scanning electron microscopy, resistance measurement, photoluminescence (PL) spectroscopy and X-ray diffractometry (XRD) techniques. The XRD patterns of nanoparticles were also studied by Rietveld refinement method for calculation of crystallite size, micro-strain and lattice parameter. The results indicate that by application of LABS and Triton X-100 as surfactant the particle size was increased. Two luminescence bands were observed in PL spectra of ITO nanoparticles with the excitation energy lower than their band gaps. It was found that the ratios of luminescence bands have relation with resistances and colors of ITO nanoparticles. In addition, the band structure of ITO nanoparticles was described considering the obtained results.

scholarly journals Investigation of AC-Measurements of Epoxy/Ferrite Composites

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 492 ◽  
Author(s):  
Moustafa A. Darwish ◽  
Alex V. Trukhanov ◽  
Oleg S. Senatov ◽  
Alexander T. Morchenko ◽  
Samia A. Saafan ◽  
...  
Keyword(s):  
Experimental Data ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
High Frequency ◽  
Precipitation Method ◽  
Semiconductor Behavior ◽  
Ferrite Composites ◽  
Co Precipitation ◽  
Theoretical Results ◽  
Composite Samples

A pure ferrite and epoxy samples as well as the epoxy/ferrite composites with different 20 wt.%, 30 wt.%, 40 wt.%, and 50 wt.% weight ferrite contents have been prepared by the chemical co-precipitation method. AC-conductivity and dielectric properties such as the dielectric constant and dielectric loss of the prepared samples have been studied. The obtained results showed that the samples had a semiconductor behavior. The dielectric constant of the composites has been calculated theoretically using several models. For the composite sample that contains 20 wt.% of ferrites, these models give satisfactory compliance, while for the composite samples with a higher percentage of nanofillers, more than 30 wt.% theoretical results do not coincide with experimental data. The investigated polymer has very low conductivity, so this type of polymer can be useful for high-frequency applications, which can reduce the losses caused by eddy current. Thus, the prepared samples are promising materials for practical use as elements of microwave devices.

Synthesis of tin oxide activated by DAN grafting and Mo nanoparticle insertion for optoelectronic properties improvement

RSC Advances ◽  
2016 ◽  
Vol 6 (98) ◽  
pp. 95405-95416 ◽  
Author(s):  
N. Bouazizi ◽  
R. Bargougui ◽  
A. Benghnia ◽  
J. Vieillard ◽  
S. Ammar ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Optoelectronic Properties ◽  
Precipitation Method ◽  
New Material ◽  
Co Precipitation ◽  
First Time

Tin oxide (SnO2) was synthesized via a co-precipitation method and activated by 1,5 diaminonaphthalene (DAN) grafting and molybdenum nanoparticle (Mo-NPs) incorporation for the first time as a new material.

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