Synthesis, characterization and optical property investigation of CdS nanoparticles

Abstract

Microwave‐assisted routes have attracted much attention for nanoparticle synthesis because of minimal solvent use and rapid, high efficiency and controlled morphology. Cadmium sulphide (CdS) nanoparticles form the line between bulk and molecular states of materials and show variation in their physical and chemical properties. Cadmium sulphate and thiourea were used as precursors during this synthesis. These are included in the category of practical semiconductor metal sulphides, which are extensively used as catalysts and optical materials. X‐ray diffraction (XRD) patterns confirmed that CdO nanoparticles are crystalline and have a hexagonal phase with crystal sizes that agree with transmission electron microscopy (TEM) data. UV–visible spectroscopy and photoluminescence (PL) spectroscopy were used to evaluate optical properties using band gap energy measurements.

Biosynthesis of CdS Quantum Dots Mediated by Volatile Sulfur Compounds Released by Antarctic Pseudomonas fragi

“…Specifically, EDS analysis of the nanoparticles obtained from Cys showed signals associated to Cd and S elements, while the XRD taken from the nanoparticles synthesized from Cys and Met as sole sulfur source, indicated the formation of cubic nanocrystals of CdS, which are related to the diffraction of the crystalline planes (111), (220), and (311). The same XRD pattern has been reported for the CdS QDs obtained via chemical (Waly et al, 2017; Bharti et al, 2018; Wang et al, 2018) and biological synthesis (Sankhla et al, 2016; Chakraborty et al, 2018). XPS analysis was developed in the 1960 by Siegbahn’s research group and, since then, it has been widely used to determine the chemical composition and state of elements present on a sample surface (Siegbahn et al, 1967).…”

Microwave-Driven Synthesis of Iron-Oxide Nanoparticles for Molecular Imaging

“…The MW-assisted rapid synthesis of metal sulfide nanostructures is interesting due to its advantages, especially in terms of processing time and control in size distribution [113]. Bharti et al [114] used an MW-assisted hydrothermal method to synthesize CdS NPs for their use as photocatalysts and solar-cell devices. For that purpose, a cadmium sulfate (CdSO 4 8H 2 O) solution was added dropwise to a previously prepared solution of thiourea ((NH 2 ) 2 CS), tertiary butyl alcohol (C 4 H 9 OH), cyclohexane (C 6 H 12 ), and CTAB, yielding an average crystal size of bulk CdS NPs of 30–60 nm.…”

Green Synthesis of CdS and CdS/rGO Nanocomposites: Evaluation of Electrochemical, Antimicrobial, and Photocatalytic Properties

“…CdS nanoparticles have shown high biocompatibility, excellent fluorescence, and optical properties, making them suitable for use in various biomedical applications. , They can be used for the fabrication of biosensors for the detection of various biological molecules . Their unique optical properties can be exploited to detect the presence and concentration of target analyte quickly and accurately. – CdS NPs can be synthesized using various methods such as chemical precipitation, hydrothermal, solvothermal synthesis, thermal decomposition, microemulsion synthesis, and laser ablation. , However, the chemical and physical methods used to synthesize CdS NPs have certain adverse effects on human beings and the environment due to the usage of poisonous chemicals and solvents which raise serious concerns; , Furthermore, expensive precursors and equipment can make the synthesis processes costly, particularly for large-scale production. Also, some methods may result in low yields of CdS nanoparticles, which can make their production inefficient.…”