Synthesis and Characterization of Cadmium Sulfide Nanoparticles by Chemical Precipitation Method

Abstract

Cadmium sulfide (CdS) nanoparticles were synthesized by chemical precipitation method using cadmium chloride (CdCl2), sodium sulfide (Na2S) and water as a solvent by varying temperatures from 20-80 degrees C. The nanoparticles were characterized by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), High-resolution transmission electron microscopy (HR-TEM) and UV-Visible spectroscopy. XRD pattern revealed cubic crystal structure for all the synthesized CdS nanoparticles. Raman spectra showed first and second order longitudinal optical (LO) phonon vibrational modes of CdS. The size of CdS nanoparticles was found to be in the range of 15-80 nm by FE-SEM analysis, in all cases. The atomic percentage of cadmium and sulfur was confirmed to be 1:1 from EDS analysis. TEM micrograph depicts the spherical shape of the particles and the size is in the range of 15-85 nm while HR-TEM images of CdS nanoparticles exhibit well-resolved lattice fringes of the cubic structure of CdS. The optical properties of CdS were examined by UV-Visible spectroscopy which showed variation in absorption band from 460-480 nm. The band gap was calculated from the absorption edge and found to be in the range of 3.2-3.5 eV which is greater than the bulk CdS.

Electrochemistry of chemiluminescent novel hybrid nanocomposites based on polyaniline and hydrolyzed pectin with CdS nanoparticles

“…27 For the CdS@HPEc-g-PANi and mCdS@HPEc-g-PANi nanocomposites, a small absorption peak was observed at 440 nm while has not been revealed in the HPEc-g-PANi which can be corresponding to the absorption peak of CdS NPs. 28 The intensity of this absorption peak was decreased slightly in mCdS@HPEc-g-PANi that can be related to the modication of the mCdS.…”

Camphor Sulfonic acid Protonated Poly (2, 5-dimethoxyaniline) - Cadmium sulfide blend thin film for Ammonia gas Sensing Application

“…But for the 75% a hump around 453nm is appeared and this red shift confirms the effective expansion of conjugation length. The absorption hump at 500nm of the CdS thin film may be due to small size CdS nanoparticles [14]. The cause for peaks with red shift and increasing intensity may be due to the strong bonding of PDMA -CSA with CdS nanoparticles and due to expanded structure of PDMA molecule by m-cresol which are initially of coil like confirmation [15].…”

SYNTHESIS OF CdS NANOPARTICLES BY CHEMICAL Co-PRECIPITATION METHOD AND ITS COMPARATIVE ANALYSIS OF PARTICLE SIZE VIA STRUCTURAL AND OPTICAL CHARACTERIZATION

“…Due to its wide energy bandgap of 2.42 eV at room temperature, it is considered as an important and promising material for the optoelectronic application like solar cell, laser, photodiode, light emitting diode, photo detectors, etc [9][10]. CdS as a semiconductor provides a variety of advantages like fabulous chemical stability, bandgap tunability, favourable electronic and optical properties and easy synthesis process [11]. Due to the ease of preparation, CdS has been mainly explored in the form of nanoparticles imparting versatile properties to it.…”

“…There are a range of methods for the synthesis of CdS nanoparticles such as chemical co-precipitation method, spray pyrolysis, sol-gel method, microwave assisted method, Thermolysis, hydrothermal method and photochemical method [12][13][14][15][16]. Among these chemical co-precipitation method is one of the most convenient, fast and green approach for the synthesis of CdS nanoparticles [11].…”