X-ray peak profile analysis and optical properties of CdS nanoparticles synthesized via the hydrothermal method (original) (raw)
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Optical, Structural and Morphological Study of CdS Nanoparticles: Role of Sulphur Source
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Cadmium sulfide (CdS) nanoparticles were synthesized by using a simple and low-cost home-made hot-injection method at a low process temperature using different sulfur (S) sources. The effects of sulfur concentration on the structural, morphological and optoelectronic properties of the synthesized cadmium sulfide films were studied using a range of characterization techniques: X-ray diffraction (XRD), Raman spectroscopy, field-emission scanning electron microscopy (FESEM) and ultraviolet–visible spectroscopy. The XRD studies revealed the formation of hexagonal-type cadmium sulfide nanoparticles. The varying morphology dependence on the sulfur source was ascertained from FESEM analysis. The longitudinal optical phonon vibrational modes of cadmium sulfide were assigned in Raman spectra at 300 and 600 cm−1. The bandgap of the cadmium sulfide particles was estimated to be 2·30 eV from Tauc’s plots. Consistent with the experimental results, this study’s first-principles density functional...
Optical, structural and morphological study of CdS nanoparticles: role of sulfur source
Nanomaterials and Energy, 2020
Cadmium sulfide (CdS) nanoparticles were synthesized by using a simple and low-cost home-made hot-injection method at a low process temperature using different sulfur (S) sources. The effects of sulfur concentration on the structural, morphological and optoelectronic properties of the synthesized cadmium sulfide films were studied using a range of characterization techniques: X-ray diffraction (XRD), Raman spectroscopy, field-emission scanning electron microscopy (FESEM) and ultraviolet–visible spectroscopy. The XRD studies revealed the formation of hexagonal-type cadmium sulfide nanoparticles. The varying morphology dependence on the sulfur source was ascertained from FESEM analysis. The longitudinal optical phonon vibrational modes of cadmium sulfide were assigned in Raman spectra at 300 and 600 cm−1. The bandgap of the cadmium sulfide particles was estimated to be 2·30 eV from Tauc’s plots. Consistent with the experimental results, this study’s first-principles density functional...
Structural and optical analysis of CdS nanocrystals prepared by low temperature thermolysis
Digest Journal of Nanomaterials and Biostructures
CdS nanoparticles were synthesized via low temperature thermolysis method using cadmium chloride and thiourea as cadmium and sulphur sources respectively. XRD analysis of nanocrystals prepared with three different synthesis times showed the crystalline nature, structure as well as particle size of the prepared CdS particles. From the peaks position of XRD spectra, the dependence of phase of CdS nanoparticles with the synthesis time has also been found. The absorption spectra enabled to visualize the blue shift in absorption onset. The bandgap of the prepared nanoparticles are found to be in the range 3.6-3.86eV. SEM, TEM and SAED images of CdS nanoparticles showed their morphology, particle size and crystallinity respectively. From the structural and SEM analysis it has been confirmed that phase change can be achieved by annealing the samples.
Structural characterization of chemically synthesized CdSe nanoparticles
Physica E-low-dimensional Systems & Nanostructures, 2009
CdSe nanoparticles were prepared at room-temperature via direct reaction between Cd(NO 3) 2 and Na 2Se in the presence of cetyltrimethyl ammonium bromide (CTAB) used as a capping material. The nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Visible absorption spectrum, Fourier transform infrared (FT-IR) spectroscopy, Raman scattering, differential scanning calorimetry (DSC), differential thermal gravimetric (DTG) and heat stage X-ray diffraction (HS-XRD). Analysis of the obtained data reveals the precipitation of defective zinc blende CdSe nanoparticles of size about 11 nm in diameter. A blue shift in the optical gap, from 1.71 to 1.82 eV, has been observed for the absorption spectrum of the synthesized CdSe nanoparticles, as an indication of quantum confinement effect. The zinc blende phase is enhanced upon annealing above the melting of Se (220 °C) as is transformed into a better order and stable wurtzite structure upon further heating. More than one melting point has been recorded for the CdSe nanoparticles referring to different ranges of particle sizes (7:25 nm). A value of 810 °C characterizes the melting point of the predominant size (11 nm) of the CdSe nanoparticles.
Indonesian Physical Review, 2020
CdS is an important wide bandgap chalcogenides most popularly studied for various optoelectronics and biosensing applications. In this study, CdS Nanoparticles (NPs) have been prepared successfully by chemical co-precipitation method, using cadmium acetate and sodium sulphide as precursors. A comparative study of average particle size calculated by Scherrer Plot, Uniform Deformation Model (UDM), Dynamic Light Scattering (DLS) analysis and Brus Model has been done here. The structural and optical behaviour of synthesized samples were investigated via X-ray diffraction (XRD), DLS and UV–Visible Spectroscopy. The XRD spectra of the prepared CdS NPs revealed the crystalline phase having cubic structure. The average particles size has been studied via Debye Scherrer equation and Scherrer Plot. For the theoretical calculations of particle size along with the induced lattice strain, considering the broadening effect of lattice strain, Williamson-Hall analysis was employed. Assuming the lat...
Influence of NaOH on structural, morphological and band gap analysis of CdS nanoparticles
Cadmium sulfide (CdS) nanoparticles plays a pivotal role in photovoltaics, sensors and detectors. The present work is on preparation of monodisperse CdS nanoparticles by using cadmium iodide and sodium sulfide as a precursor, where sodium hydroxide (NaOH) acts as a capping agent in methanol solvent. Synthesis of CdS nanoparticles was carried out with different molar concentrations of NaOH. The particle sizes were calculated from Bru‟s equation by using UV-Visible absorption spectrum. The functional groups of the samples and morphology were studied by FTIR and HRTEM respectively.
Cadmium sulfide nanoparticles were synthesized with different sizes by chemical precipitation method. Transmission electron microscopy (TEM) and X-ray diffraction pattern (XRD) used to study the morphologies, distribution, and crystallinty of the CdS nanoparticles and to calculate the values of their sizes. The results indicated that the CdS were formed with cubic structure and the particle size decreases with increasing the Cd +2 ions. The Cd-S stretching vibration band appeared in the far infrared region at about 250 cm -1 and there is no effect of the particle sizes on the position of this band. Dependence of the blue shift and optical band gap on the quantum size effect was confirmed by UV-Visible spectroscopy. The dielectric properties are studied in the frequency range (2.5 KHz-5MHz) at different temperatures.
Synthesis of Nanocrystalline CdS by SILAR and Their Characterization
Journal of Materials, 2014
A simple and cost effective chemical technique has been utilized to prepare cadmium sulphide (CdS) nanoparticles at room temperature. The sample is characterized with XRD (X-ray diffractometer), SEM (scanning electron microscope), TEM (transmission electron microscope), FTIR (Fourier transform infrared), EDX (energy dispersive X-rays), and UV-VIS (ultraviolet visible) spectrophotometer. The particle size estimated using X-ray line broadening method is ∼21.5 nm. While particle size estimation, both instrumental and strain broadening was taken into account. The lattice strain was evaluated using Williamson-Hall equation. SEM illustrates formation of submicron size crystallites and TEM image gives a particle size of ∼23.5 nm. The characteristic stretching vibration frequency of CdS was observed in the absorption band in FTIR spectrum. Optical absorption study exhibits a band gap energy value of about 2.44 eV.
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.
A facile route for preparation of CdS nanoparticles
2007
CdS nanoparticles have been synthesized by a chemical reaction route using ethylenediamine as a complexing agent. The nanoparticles were characterized using techniques such as X-ray powder diffraction (XRD), scanning electron microscope (SEM), UV-VIS absorption spectroscopy, and photoluminescence spectroscopy. The absorption edge for the bulk hexagonal CdS is at 512 nm (2.42 eV). Comparing with the bulk CdS, it is believed that the blue shift in the absorption peak was caused by the quantum confinement effect. Photoluminescence measurements indicate CdS nanoparticles show fluorescence band with a maximum close to 315 nm.