OPTICAL AND STRUCTURAL PROPERTIES OF Zn(1-x)FexS NANOPARTICLES SYNTHESIZED BY CHEMICAL BATH DEPOSITION METHOD

2011 ◽  
Vol 04 (01) ◽  
pp. 101-105 ◽  
Author(s):  
S. SELMANI ◽  
H. ABDULLAH ◽  
S. SHAARI ◽  
R. ABD-SHUKOR
Keyword(s):  
Chemical Bath Deposition ◽  
Average Particle Size ◽  
Chemical Bath Deposition Method ◽  
Average Particle ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
Quenching Effect ◽  
Optical Absorbance ◽  
Band Transition ◽  
Diffraction Patterns

Nanoparticles of Zn (1-x) Fe x S with x = 0.0, 0.05, 0.1, 0.15, 0.2 and 0.3 were synthesized using the chemical bath deposition method, using tri-sodium citrate as a complexion agent. These nanoparticles were characterized using XRD, SEM, optical absorbance and photoluminescence. SEM micrographs of the films revealed the combination of Zn (1-x) Fe x S nanoparticles with an average particle size D ~ 60.3 to 19.3 nm ± 0.01 nm for x = 0.0 to 0.3. X-ray diffraction patterns confirmed the nanocrystalline cubic ZnS phase formation. UV-visible spectrometer measurement showed high absorbance for Fe concentration x ≥ 0.15 in the wavelength range 325–800 nm. However, for x ≤ 0.1, the absorbance of the films decreased with further increase of Fe concentration. From the absorbance data, the direct bandgap values have been calculated to be in the range Eg = 3.5 to 2.23 eV for x = 0.0 to 0.3. The bandgap decreased with the increase of Fe concentration in the films. The photoluminescence spectra of the films showed two emission peaks, the first in the low wavelengths due to band-to-band transition, and the second in the high wavelengths due to the transitions probabilities and to the concentration of Fe ions. Due to the quenching effect, the intensity of PL spectra decreased on further increase of Fe doping.

Pb2+ and Ce3+ Doped SrZnO2: New Blue Luminescent Phosphors

2006 ◽  
Vol 916 ◽  
Author(s):  
Alp Manavbasi ◽  
Jeffrey C LaCombe
Keyword(s):  
Sol Gel ◽  
Average Particle Size ◽  
Broad Band ◽  
Emission Spectra ◽  
Broad Emission Band ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Broad Emission ◽  
Diffraction Patterns ◽  
Individual Particles

AbstractTwo new blue emitting phosphors, SrZnO2:Pb2+ and Ce3+ were synthesized by adipic acid and sucrose templated sol-gel routes, respectively. The resulting phosphor particles were fine, nanocrystalline and pure. The optimum activator concentrations were found to be 1 mol% Pb2+ and 12 mol% Ce3+. Two excitation bands centered at 283 and 317 nm, plus a weak shoulder at 275 nm were observed for Pb2+ doped samples, however only one broad excitation band with a maximum at 294 nm was observed for Ce3+ doped samples fired at 1000 °C for 2h. The emission spectra of SrZnO2:Pb2+ showed a very broad band extending from 374 to 615 nm with a maximum at ~455 nm which was ascribed to the 3P1 ¡æ 1S0 transition on the Pb2+ ions allowed by the strong spin-orbit (SO) coupling. Similarly, SrZnO2:Ce3+ showed a broad emission band extending from 374 to 609 nm and centered at 467 nm. This broad emission was attributed to the 5d1 ¡æ 4f1 transition of Ce3+ ions. The lower level 2F5/2 of the 4f1 is populated but the level 2F7/2 is almost empty at room temperature where all measurements were taken. The luminescence properties of Ce3+, K+ co-doped SrZnO2 revealed that the characteristic band locations remained the same and the ratio of emission to excitation intensities were constant. X-ray diffraction patterns showed that the SrZnO2 phase started to form at 900 °C (after 2 hrs), and the single-phase SrZnO2 obtained at 1000 °C. SEM micrographs of both phosphors have a rounded and filled morphology for individual particles with an approximate diameter of 50-250 nm. Dynamic light scattering studies revealed that average particle size is around 1 ¥ìm for both phosphors.

scholarly journals PCL/PHBV Microparticles as Innovative Carriers for Oral Controlled Release of Manidipine Dihydrochloride

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Fernanda Malaquias Barboza ◽  
Willian Moreira Machado ◽  
Luiz Renato Olchanheski Junior ◽  
Josiane Padilha de Paula ◽  
Sônia Faria Zawadzki ◽  
...  
Keyword(s):  
Controlled Release ◽  
Animal Studies ◽  
Average Particle Size ◽  
Spherical Shape ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Chemically Modified ◽  
Diffraction Patterns

Microparticles of poly(ε-caprolactone) (PCL) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) containing manidipine dihydrochloride (MAN) were successfully prepared by the simple emulsion/solvent evaporation method. All formulations showed loading efficiency rates greater than 80% and average particle size less than 8 μm. Formulations had spherical shape with smooth and porous surface for PCL and PHBV, respectively. According to Fourier-transform infrared spectroscopy, initial components were not chemically modified during microencapsulation. X-ray diffraction patterns and differential scanning calorimetry demonstrated that this process led to drug amorphization.In vitrodissolution studies showed that all microparticles prolonged MAN release, mainly which one obtained using PCL that contained 5% of drug loaded (PCL-M5). Animal studies demonstrated that formulationPCL-M5was able to keep the variation of mean arterial pressure after phenylephrine administration up to 24 hours. These data confirmed the sustained antihypertensive effect of the investigated microparticles. Results provided an experimental basis for using formulationPCL-M5as a feasible carrier for oral controlled release of MAN intended for treating high blood pressure.

scholarly journals Deposition and characterization of Cu4SnS4 thin films by chemical bath deposition method

2010 ◽  
Vol 29 (1) ◽  
pp. 97 ◽  
Author(s):  
Anuar Kassim ◽  
Tan Wee Tee ◽  
Abdul Halim Abdullah ◽  
Saravanan Nagalingam ◽  
Ho Soon Min
Keyword(s):  
Thin Films ◽  
Atomic Force Microscopy ◽  
Chemical Bath Deposition ◽  
Chemical Bath Deposition Method ◽  
Oxide Glass ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force

A low cost chemical bath deposition method has been used for the preparation of Cu4SnS4 thin films onto indium tin oxide glass substrate. The deposition parameters such as bath temperature (50 °C), deposition time (120 min), electrolyte concentration (0.05 M) and bath pH (1.5) were optimized to obtain good quality thin films. The structural, surface morphological and optical properties of thin films were studied by X-ray diffraction, an atomic force microscopy and an UV-Vis Spectrophotometer, respectively. The X-ray diffraction study revealed that the Cu4SnS4 films were polycrystalline in nature with the preferential orientation along the (221) plane. The atomic force microscopy results indicated that the films were smooth, uniform and the substrate surface was covered completely at these experimental conditions. These films exhibited p-type semiconductor behavior with the band gap energy about 1.57 eV.

scholarly journals Synthesis and characterization of PbS nanowires doped with Tb3+ ions by using chemical bath deposition method

2019 ◽  
Vol 10 (1) ◽  
pp. 1-7 ◽  
Author(s):  
L. F. Koao ◽  
Fekadu Gashaw Hone ◽  
F. B. Dejene
Keyword(s):  
Band Gap ◽  
Chemical Bath Deposition ◽  
Potassium Hydroxide ◽  
Luminescent Properties ◽  
Deposition Process ◽  
Chemical Bath Deposition Method ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
X Ray

AbstractCrystalline lead sulfide (PbS) nanowires doped with terbium (Tb3+) ions were synthesized by the chemical bath deposition method at room temperature. The powder was obtained from an aqueous solutions using lead acetate dehydrate, terbium nitrate, thiourea, potassium hydroxide and ammonia. The terbium molar concentrations were varied in the deposition process to investigate the effect on the structural, optical, morphological and luminescent properties of PbS nanowires. The crystalline size was found to be dependent on the concentration of the Tb3+ ions used. The estimated average crystalline sizes were calculated from the X-ray diffraction and found to be 34, 33 and 37 nm for PbS: 0% Tb3+, PbS: 0.2% Tb3+ and PbS: 0.5% Tb3+, respectively. The scanning electron microscopy micrographs depict nanowire shape for the undoped as well as Tb-doped samples. The energy-dispersive X-ray and Auger electron spectroscopy analyses confirmed the presence of all the expected elements. The solid powder nanowires exhibited high absorptions in the UV–Vis regions. The band gap energies were estimated in the range of 1.99–2.46 eV. The absorption edge and the band gap energies of these PbS nanowires have shifted depending on the concentration of the dopant. The maximum luminescence intensity was obtained for PbS: 0.2% Tb3+ ions and luminescent quenching was observed for higher terbium concentrations. Graphic abstract

Synthesis and Characterization of Cadmium Sulfide Thin Film Grown by Chemical Bath Deposition Method

2015 ◽  
Vol 2 (2) ◽  
pp. 79-81
Author(s):  
Thambidurai.S ◽  
Kannan.P
Keyword(s):  
Thin Films ◽  
Chemical Bath Deposition ◽  
Bath Temperature ◽  
Chemical Bath Deposition Method ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Cds Thin Films

CdS thin films were prepared by chemical bath deposition method on glass substrate, Bath temperature range of 800C. Steps using aqueous solution of cadmium sulphate and thiourea salts were used as cadmium Cd+2 and sulfur S-2 ions sources to prepare CdS thin films. Structural characterization was carried out by X-ray diffraction and optical transmission was carried out by UV-Vis spectrometer. Photoluminescence spectra were recorded in the in the range of 300 – 900 nm at the temperature range of 10 K

Effect of Ag+ ion Concentration on the Reaction Kinetics and Shape of Nanoparticles Synthesised by Green Chemical Approach

2016 ◽  
Vol 66 (4) ◽  
pp. 368
Author(s):  
S.S. Kalyan Kamal ◽  
J. Vimala ◽  
P.K. Sahoo ◽  
P. Ghosal ◽  
L. Durai
Keyword(s):  
Average Particle Size ◽  
Ion Concentration ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
Visible Absorption ◽  
Plasmon Band ◽  
Transmission Electron ◽  
Diffraction Patterns ◽  
Shape Of Nanoparticles

The effect of varying Ag+ ion concentration on the green chemical reaction with a fixed tea aliquot concentration has been studied in detail with the help of UV-visible absorption spectra. With increase in the concentration of Ag+ solution the position of surface plasmon band systematically increased from 435 nm – 450 nm. The reaction followed first order kinetics and the rate of reaction increased in a linear fashion with k = 3.54 x 10-4 min-1 for 0.5 mL to k = 1.86 x 10-3 min-1 for 3.0 mL Ag+ solution. X-ray diffraction patterns showed an enhanced (200) reflection for 3.0 mL Ag sample. The shape of Ag nanoparticles could be effectively tuned from spherical to cuboid with increase in silver content as evidenced from scanning electron and transmission electron micrographs. The average particle size of Ag NPs increased from 25 nm to 55 nm with increase in the Ag+ content of the reaction.

Synthesis of Mercury Cadmium Telluride Nanoparticles by Solvothermal Method

2005 ◽  
Vol 878 ◽  
Author(s):  
RangaRao Arnepalli ◽  
Viresh Dutta
Keyword(s):  
Cadmium Telluride ◽  
Mercury Cadmium Telluride ◽  
Solvothermal Method ◽  
Average Particle Size ◽  
Average Particle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Patterns ◽  
First Time ◽  
Elemental Form

Abstract:Mercury Cadmium Telluride (MCT) nanoparticles were synthesized by Solvothermal method for the first time. Mercury, Cadmium and Tellurium in compound/elemental form were added to Ethylenediamine (solvent) in the Teflon-Stainless-Steel autoclave along with a reducing agent. Different compositions of MCT were synthesized by varying the proportions of Hg and Cd to obtain Hg1-xCdxTe with x varying from 1 to 0. X-ray diffraction patterns revealed the formation of MCT nanoparticles with predominant cubic (111) phase. TEM studies revealed that the average particle size ranged from 10 to15 nm for different compositions.

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