Synthesis of photoluminescent pure and doped cadmium sulfide by reverse microemulsion method (original) (raw)
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Cadmium sulfide (CdS) is one of the most promising materials for solar cells and of great interest for their practical applications in electronics and photonics. Yellow colored CdS nanoparticles were synthesized by wet chemical route at room temperature using 2-mercaptoethanol was used as the capping agent. The crystallographic and optical properties of CdS nanoparticles have been characterized by X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR) and UV-Vis-NIR absorption spectroscopy. XRD analysis showed that CdS nanoparticles have cubic Zinc blend crystal structure. The average crystalline size determined by using Debye Scherrer's formula was of the order of 2.34 nm. The lattice constant and other crystallographic parameter were obtained using XRD data. The functional groups and chemical interaction were determined by FTIR spectra. From FTIR spectra, it is investigated that absorption bands show the presence of resonance interaction between vibrational modes of oxide ions in the crystal. UV-Visible absorption spectrum of CdS nanoparticles showed that absorption edge max = 501 nm and corresponding band gap energy is found to be E g = 2.46 eV. In the present work, we have reported the crystallographic and optical properties of CdS nanoparticles synthesized by a colloidal wet chemical route.
Effect of Mn Doping on Micro-Structural and Optical Properties of Cadmium Sulfide Nanoparticles
Mn doped CdS nanoparticles have been synthesized by chemical precipitation method. This diluted magnetic semiconductor nano particles were characterized using X-ray diffractometer, scanning electron microscope, UV-Vis spectrometer and photoluminescence technique and the results were presented. The XRD pattern confirms that the Mn doped CdS has a cubic geometry and the formation of nanoparticles. The micro-structural properties such as grain size, microstrain, dislocation density and the texture coefficient were estimated and reported. The lattice constant has been determined using Nelson-Relay function. The increase in the band gap was observed by optical studies as the Mn doping concentration increases. Quenching and quantum yield was reported.
Size Distributions of Cadmium Sulfide Nanoparticles Obtained from Templating Methods
Annals of the New York Academy of Sciences, 2008
Cadmium sulfide (CdS) nanoparticles were obtained by soft templating methods using either an already established revered micelle route or a new procedure based on gel electrophoresis. The UV-Vis absorption or the photoluminescence excitation spectra were fitted using the CdS electronic structure available in the literature together with a size distribution. The obtained results indicate that the amount of sodium dodecyl sulphate as a component of the agarose gel formulation has a profound effect on the resulting nanoparticle population.
Present research paper deals with the synthesis and characterization of CdS:Co and CdS:Ni nanoparticles. CdS:Co and CdS:Ni nanoparticles are synthesized with the different concentration of Co and Ni with the use of polyethylene glycol (PEG) as capping agent. Samples are characterized by Scanning Electron Microscopy (SEM), Ultraviolet-Visible (UV-VIS) and Photoluminescence (PL) spectroscopy. The size of synthesized nanoparticles is obtained ~50 nm approximately by SEM images. The effect of doping concentration on optical properties of CdS nanoparticles is studied by UV-VIS and PL spectroscopy. Band gap of Cd 1-x Co x S and Cd 1-x Ni x S nanomaterials decreases with doping concentration. The results demonstrate that the doping concentration play an important role in optical features of nanomaterials. On behalf of the outcomes, it can be reported that the nanoparticles can be utilized as a photodetectors operating in visible region of increasing wavelengths. Cite This Article: P. Bhambhani, and P. A. Alvi, " A Systematic Study of the Optical Properties of Co-, and Ni-Doped Colloidal Cadmium Sulphide Nanoparticles.
Cadmium sulphide nanocrystals (CdS NCs) of ≈ 7.0 nm have been synthesized and structurally characterized with X-Ray Diffraction (XRD), High Resolution Transmission Electron Microscope (HR-TEM) and topographical 3D image by Atomic Force Microscopy (AFM). The binding and kinetic energies of 5 th electron of 3d orbital (inner 3d5/2) and 3 rd (outer 3d3/2) of Cd were 405.93 and 412.67 eV as well as 1074 and 1080.76 eV respectively determined with XPS. The CdS at 298.15 K, when dispersed in water, methanol and ethanol with 100 µM each of rhodamine B (RB), sulphorhodamine B (SRB) and carboxyfluorescein (CF) the fluorescent dyes (FD) separately has enhanced UV-Vis absorbance by 45, 30 and 25% respectively in order of (RB-CdS) > (SRB-CdS) > (CF-CdS) within 200 to 320 nm as compared to without CdS. Probably the CdS has functionalized the functional groups of the dyes that could have induced the -conjugated bonds to detain higher UV-Vis abs. especially one-COOH, four-CH2CH3, two-SO3, four-CH2CH3 and two –COOH, one >C= with one hydroxyl group respectively. Thus, the CdS-Dye-UV-Vis model could be proposed as new finding of our studies.
Chemistry and photophysics of mixed cadmium sulfide/mercury sulfide colloids
The Journal of Physical Chemistry, 1993
Aqueous co-colloidal systems consisting of two nanocrystalline, size-quantized groups 11-VI semiconductor particles were investigated. Coating the HgS colloids with a layer of CdS leads to core-shell-like structures with electronic properties differing considerably to the sum of the separate particles. Implantation of HgS in the surface of CdS gives a new system with very colorful fluorescence properties. Evidence for a charge carrier transfer in this system is obtained from optical spectroscopy. Spectroscopic experiments, as well as electron microscopy studies, give insight into the geometrical and energetic structure and the charge carrier dynamics in such systems.
Study of Zr and Sn Doping on Photoluminescence Property of Cadmium Sulphide Nanoparticles
Proceedings of the International Conference on Communication and Signal Processing 2016 (ICCASP 2016), 2017
Semiconductor nanoparticles have drawn significant attention due to their excellent application in optoelectronics and photonics. Cadmium Sulphide extended its application in the field of photoluminescent materials. In present study, Zr and Sn doped Cadmium Sulphide nanoparticles prepared by Chemical coprecipitation method. The morphology of nanomaterial was examined with the scanning electron microscopy (SEM). EDX spectra confirmed the presence of Zr and Sn in Cadmium Sulphide material. X-ray diffraction analysis explains the range of material synthesized is in nanoscale. Photoluminescence property was studied by PL spectra and it was observed that Zr and Sn doped CdS nanomaterial shows excellent photoluminescency stoichiometric proportion synthesis of doped CdS material hamper the intensity.
We used different molar ratios of CdCl 2 and Na 2 S to prepare CdS nanoparticles by chemical precipitation method and to control the particle sizes. The effects of the particle size on the optical and electrical properties were confirmed. a b s t r a c t Cadmium sulfide (CdS) nanoparticles with different sizes were synthesized using chemical precipitation method. The change of particle size, morphologies and crystal structures with the molar ratio of cadmium to sulfide salt was obtained from transmission electron microscopy (TEM) and X-ray diffraction pattern results. It should be noted that, the CdS nanoparticles were formed with different size, normal distribution and cubic phase. The effect of particle sizes on the optical properties was confirmed from UV-visible and fluorescence spectroscopic data. The optical band gap decreases from 2.9 to 2.51 eV with increasing the particle size from 5 to 9.25 nm due to the change of the molar ratio of CdCl 2 to Na 2 S from (16:1) to (1:16). The electrical results obtained show that, DC conductivity increase with decreasing the particle sizes. The conduction mechanisms were discussed at low and high applied voltage. All samples have semiconducting behavior and can be used in the field of light emitting diodes.