Synthesis, Characterization and Optical Properties of CdxZn1-xS Nanocrystals

2015 ◽  
Vol 832 ◽  
pp. 158-167 ◽  
Author(s):  
J. Theerthagiri ◽  
R.A. Senthil ◽  
J. Madhavan
Keyword(s):  
Optical Properties ◽  
Chemical Method ◽  
Synthetic Approach ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
Phase Purity ◽  
X Ray ◽  
Wet Chemical ◽  
Co Precipitation ◽  
Formation Phase

Nanocrystalline Cd1-XZnXS (X=0.0, 0.2, 0.4, 0.5, 0.6, 0.8 and 1.0) were synthesized by simple wet chemical method via co-precipitation. The formation, phase purity and crystalline size were ascertained by X-ray diffraction (XRD). The shape and surface morphology of the synthesized samples were characterized by scanning electron microscopy (SEM). The optical properties of the Cd1-XZnXS samples were investigated using UV-vis absorption spectroscopy and photoluminescence spectroscopy (PL) studies. The optical properties of the sample was dramatically changed by varying the composition of Cd1-XZnXS system, which may be due to the synergic effect originated by combining CdS and ZnS. The obtained optical behaviors suggest that the material can be suitable for the photocatalytic degradation of organic pollutants. The prsent investigation demontrated that the synthetic approach developed in this is highly reproducible and can be readily scaled up for potential industrial production.

scholarly journals Characterization of ferrite nanoparticles for preparation of biocomposites

2017 ◽  
Vol 8 ◽  
pp. 1257-1265 ◽  
Author(s):  
Urszula Klekotka ◽  
Magdalena Rogowska ◽  
Dariusz Satuła ◽  
Beata Kalska-Szostko
Keyword(s):  
Chemical Method ◽  
Ferrite Nanoparticles ◽  
Chemical Activity ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
X Ray ◽  
Transmission Electron ◽  
Wet Chemical

Ferrite nanoparticles with nominal composition Me0.5Fe2.5O4 (Me = Co, Fe, Ni or Mn) have been successfully prepared by the wet chemical method. The obtained particles have a mean diameter of 11–16 ± 2 nm and were modified to improve their magnetic properties and chemical activity. The surface of the pristine nanoparticles was functionalized afterwards with –COOH and –NH2 groups to obtain a bioactive layer. To achieve our goal, two different modification approaches were realized. In the first one, glutaraldehyde was attached to the nanoparticles as a linker. In the second one, direct bonding of such nanoparticles with a bioparticle was studied. In subsequent steps, the nanoparticles were immobilized with enzymes such as albumin, glucose oxidase, lipase and trypsin as a test bioparticles. The characterization of the nanoparticles was acheived by transmission electron microscopy, X-ray diffraction, energy dispersive X-ray and Mössbauer spectroscopy. The effect of the obtained biocomposites was monitored by Fourier transform infrared spectroscopy. The obtained results show that in some cases the use of glutaraldehyde was crucial (albumin).

Structural and Magnetic study of Al3+ doped Ni0.75Zn0.25Fe2-xAlxO4 nanoferrites

2013 ◽  
Vol 1506 ◽  
Author(s):  
L. Wang ◽  
B. K. Rai ◽  
S. R. Mishra
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Chemical Method ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
X Ray ◽  
Transmission Electron ◽  
Magnetic Dilution ◽  
Wet Chemical ◽  
Structural And Magnetic Properties

AbstractNanostructured Al3+ doped Ni0.75Zn0.25Fe2-xAlxO4 (x = 0.0,0.2,0.4,0.6,0.8, and 1.0) ferrites were synthesized via wet chemical method. X-ray diffraction, transmission electron microscopy, and magnetization measurements have been used to investigate the structural and magnetic properties of spinel ferrites calcined at 950 °C .With the doping of Al3+, the particle size of Ni0.75Zn0.25Fe2-xAlxO4 first increased to 47 nm at x = 0.4 and then decreased down to 37 nm at x = 1. Saturation magnetization decreased linearly with Al3+ due to magnetic dilution. The coercive field showed an inverse dependence on the particle size of ferrites.

Optical properties and energy transfer processes in Tb3+-doped ZnSe quantum dots

2021 ◽  
Author(s):  
Nguyen Ca ◽  
N. D Vinh ◽  
Phan Van Do ◽  
N. T. Hien ◽  
Xuan Hoa Vu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Quantum Dots ◽  
Chemical Method ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
X Ray ◽  
Transfer Processes ◽  
Transmission Electron ◽  
Wet Chemical

Tb3+-doped ZnSe quantum dots (QDs) with Tb content in the range of 0.5 - 7% were successfully synthesized by a wet chemical method. X-ray diffraction (XRD) and transmission electron microscopy...

Synthesis, Structural Characterization and Morphological Studies of Nanocrystalline CdO by Wet-Chemical Method

2018 ◽  
Vol 24 (8) ◽  
pp. 5519-5522
Author(s):  
Israr Ul Hassan ◽  
Liji John ◽  
R. Selwin Joseyphus ◽  
I. Hubert Joe ◽  
R. S Amritha ◽  
...  
Keyword(s):  
Grain Size ◽  
Chemical Method ◽  
Cadmium Oxide ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
X Ray ◽  
Morphological Studies ◽  
Oxide Particles ◽  
Wet Chemical ◽  
Scanning Electron

Synthesis of nanocrystalline cadmium oxide particles were explored by the reaction of inorganic precursor (cadmium chloride) and alkali (sodium hydroxide) via modified wet-chemical method followed by annealing at various temperatures (250, 500 and 750 °C). The structural, optical and morphological studies of cadmium oxide samples were carried out by X-ray diffraction, infrared, ultraviolet-visible, and scanning electron microscope techniques. From X-ray diffraction analysis, it was confirmed that cadmium oxide particles furnish a face centred cubic phase structure and revealing a grain size of around 59 nm. The scanning electron microscope micrographs admit that cadmium oxide samples are agglomerated and have spherical shapes. The bonding deformation and stretching frequency results of cadmium oxide samples were obtained from infrared spectra. The corresponding increase in calcination temperatures has shown an increase in particle size while as no change was found in band gape. These results attribute that the variation in annealing temperature has a significant role on the crystalline nature, grain size and its optical properties. Furthermore, the synthesized cadmium oxide samples were examined for bioactivity analysis.

The Preparation and Optical Properties of Ag/ZnO Composite Materials

2014 ◽  
Vol 875-877 ◽  
pp. 232-236
Author(s):  
Ming Tao Zhou ◽  
Peng Xi Zhu ◽  
Yue Zhao ◽  
Yi Ni Min ◽  
Xiang Peng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chemical Reduction ◽  
Zinc Nitrate ◽  
Hybrid Nanostructures ◽  
X Ray Diffraction ◽  
Chemical Reduction Method ◽  
Wet Chemical Method ◽  
X Ray ◽  
Wet Chemical ◽  
Silver Metal

A simple, two-step fabrication technique was presented to prepare the Ag/ZnO hybrid nanostructures using silver nitrate and zinc nitrate. Silver particles were synthesized by chemical reduction method and the ZnO layer was coated on the surface of silver using wet chemical method. The microstructure, the composition and the optical properties of the obtained materials were further characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence (FL) spectroscopy. The results showed that the silver and zinc oxide composite had been successful prepared. The intensity of fluorescence showed an enhancement of R6G (dye) indicate that ZnO shell had an improvement on the silver metal enhance fluorescence.

Formation of maghemite nanoparticles in bismuth telluride materials containing iron

2010 ◽  
Vol 25 (10) ◽  
pp. 2042-2046
Author(s):  
R.M. Catchings ◽  
A.N. Thorpe ◽  
J.R. Grant ◽  
R. Douglas ◽  
C. Viragh ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Bismuth Telluride ◽  
Photoelectron Spectroscopy ◽  
Chemical Method ◽  
Oxide Nanoparticles ◽  
Maghemite Nanoparticles ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
X Ray ◽  
Wet Chemical

Bismuth telluride (Bi2Te3) systems containing 2%, 4%, and 8% of iron were prepared using a low temperature wet chemical method. Iron oxide nanoparticles were formed when the samples were heated in hydrogen at 250 °C for at least six hours. The samples were characterized by x-ray diffraction, magnetization, magnetic susceptibility, x-ray photoelectron spectroscopy, Mössbauer spectroscopy, and wet chemical analysis measurements. The nanoparticles of iron oxide were identified as γ-Fe2O3 with a particle size of ˜5 nm.

Fabrication and characterization of n-ZnO nanorods/p-Si (100) heterojunction

2015 ◽  
Vol 24 (04) ◽  
pp. 1550050 ◽  
Author(s):  
Kieu Loan Phan Thi ◽  
Lam Thanh Nguyen ◽  
Anh Tuan Dao ◽  
Nguyen Huu Ke ◽  
Vu Tuan Hung Le
Keyword(s):  
Chemical Method ◽  
Room Temperature ◽  
Zno Nanorods ◽  
Average Height ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
X Ray ◽  
Wet Chemical ◽  
Fabrication And Characterization

In this paper, ZnO nanorods were grown by wet chemical method on p-Si (100) substrate to form n-ZnO nanorods/p-Si (100) heterojunction. The optical, electrical, structural properties of n-ZnO nanorods/p-Si(100) heterojunction were analyzed by the photoluminescence (PL) spectroscopy, [Formula: see text]–[Formula: see text] measurement, X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The room temperature PL spectra reveal the good optical property of the heterojunction with strong UV peak at 385[Formula: see text]nm. The ZnO nanorods were vertically well-aligned on p-Si (100) and had an average height of about 1.6[Formula: see text][Formula: see text]m. The n-ZnO nanorods/p-Si (100) heterojunction also exhibits diode-like-rectifying-behavior.

scholarly journals Synthesis of BaTiO3-TiO2-Graphene Nanocomposites and Kinetics Studies on their Photocatalytic Activity

2016 ◽  
Vol 17 (4) ◽  
pp. 281 ◽  
Author(s):  
J. Li ◽  
J.W. Ko ◽  
W.B. Ko
Keyword(s):  
Chemical Method ◽  
Organic Dyes ◽  
Barium Chloride ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
Graphene Nanocomposites ◽  
X Ray ◽  
Chloride Dihydrate ◽  
Kinetics Studies ◽  
Wet Chemical

<p>BaTiO<sub>3</sub>-TiO<sub>2</sub> nanoparticles were fabricated by a wet-chemical method using barium chloride dihydrate (BaCl<sub>2</sub>·2H<sub>2</sub>O), titanium dioxide (TiO<sub>2</sub>), and oxalic acid (C<sub>2</sub>H<sub>2</sub>O<sub>4</sub>) as precursors. BaTiO<sub>3</sub>-TiO<sub>2</sub>-graphene nanocomposites were obtained by heating the BaTiO<sub>3</sub>-TiO<sub>2</sub> nanoparticles with graphene in an electric furnace at 700 °C for 2 h. X-ray diffraction analysis revealed that the resulting products were BaTiO<sub>3</sub>-TiO<sub>2</sub>-graphene nanocomposites. Scanning electron microscopy revealed the morphologyof the nanocomposites. UV-vis spectrophotometry was used to analyze the photocatalytic degradation of several organic dyes using the BaTiO<sub>3</sub>-TiO<sub>2</sub>-graphene nanocomposites as a photocatalyst under ultraviolet irradiation at 254 nm.</p>

scholarly journals Structural and thermal properties of Zn-containing magnesium aluminate spinels obtained by wet chemical method

2019 ◽  
Vol 37 (2) ◽  
pp. 238-243
Author(s):  
Omer Kaygili ◽  
Niyazi Bulut ◽  
Tankut Ates ◽  
Ismail Ercan ◽  
Suleyman Koytepe ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Properties ◽  
Chemical Method ◽  
Lattice Parameter ◽  
Magnesium Aluminate ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
X Ray ◽  
Ft Ir ◽  
Wet Chemical

AbstractIn the present study, the dopant effect of Zn on the crystal structure, thermal properties and morphology of magnesium aluminate (MgAl2O4) spinel (MAS) structure was investigated. A pure and two Zn-containing MASs (e.g. MgAl1.93Zn0.07O4 and MgAl1.86Zn0.14O4) were synthesized for this purpose via a wet chemical method, and the as-prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, differential thermal analysis (DTA), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy techniques. It was found that the crystal structure, thermal properties and morphology of the MAS system change with the increase in the amount of Zn. MgO phase formation was observed. The values of the lattice parameter, unit cell volume and crystallite size increased, and the crystallinity percentage decreased. The morphology was also affected by adding of Zn.

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