N. S. Kozhevnikova

Cadmium sulfide nanoparticles prepared by chemical bath deposition

Key results of recent studies on cadmium sulfide nanoparticles are systematized. The dependence of the structure and properties of CdS nanoparticles on the nanoparticle size is illustrated. The possibility of utilizing CdS quantum dots as biological labels and sensitizers for solar cells is analyzed. The principles, features and potential of the method of aqueous solution deposition are described from the standpoint of synthesis of CdS nanocrystals and hybrid forms based on them with specified structure and properties.The bibliography includes 180 references.

Preparation of stable colloidal solution of cadmium sulfide CdS using ethylenediaminetetraacetic acid

By the method of chemical condensation a stable aqueous colloidal solution of nanoparticles of cadmium sulfide was obtained. The solution obtained in the daylight had a bright lemon-yellow color. For the temporary stabilization of the solution was used an organic complexone, disodium ethylenediaminetetraacetate (EDTA), that prevented coagulation of colloidal particles up to several months at 4°C. At room temperature, the solution remained stable during a month. The structure and properties of the disperse phase were studied by the X-ray diffraction, optical fluorescence, and electron microscopy. The solid particles size is about 3 nm, they have a disordered close-packed structure with the space group P6mm and possess the photoluminescence color from green to orange depending on the duration of keeping the solution. The size of coagulates was 10 nm, 100 nm, and 1 μm after keeping for 1, 2, and 4 months, respectively.

Microstructure of nanocrystalline PbS powders and films

Nanocrystalline PbS powders and nanostructured PbS films have been produced by different deposition procedures. According to scanning and transmission electron microscopy results, the average size of PbS particles in the nanopowders is 8 to 20 nm, and the average grain size in the nanofilms is 40 to 80 nm. As shown by electron diffraction, the nanocrystalline PbS powders have the B1 structure (sp. gr.

Transition of the CdS Disordered Structure to the Wurtzite Structure with an Increase in the Nanoparticle Size

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Effect of the size and structure factors on the magnetic susceptibility of nanoparticles of cadmium sulfide

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Design of the nanocrystalline CdS@TiO 2 photocatalyst

A convenient and effective one-pot three-component synthesis of the lead sulfide nanoparticles was developed on the basis of the exchange reaction between the lead acetate and sodium sulfide in water at the ambient conditions. A possibility was shown of the direct reaction between the lead Pb2+ and sulfide S2− ions in an aqueous solution, resulting in a solid phase which contained PbS nanoparticles only, avoiding the hydrolysis stage.

A study of cadmium sulfide nanocrystalline films by grazing incidence X-ray diffraction

The dependence of the structure of cadmium sulfide nanoparticles on their size has been established for nanopowders and thin films. Nanoparticles from 3 to 8 nm in size have a disordered close-packed structure, characterized by the absence of periodic sequence of packing planes. Particles more than 14 nm in size have wurtzite structure, which is typical of bulk cadmium sulfide. The size of the disordered-phase particles was determined from the Scherrer-Debye formula. The size of wurtzite-phase particles was determined by the Williamson-Hall method.

Nanostructured ZnS with random close-packed structure: Synthesis, formation rate, and crystal structure study

The region of stable coexistence of Cd(OH)2 and CdS as a function of pH and the concentration of the complex-forming agent (ammonia) was determined by thermodynamic analysis with the purpose of the preparation of Cd(OH)2 cadmium hydroxide particles surrounded by cadmium sulfide CdS shells. In this region, powders were obtained by chemical precipitation during various precipitation times from aqueous solutions. X-ray diffraction was used to track the growth of the CdS nanophase of a disordered structure and hexagonal Cd(OH)2 phase consumption with time. It was found by complexonometry that part of cadmium formed insoluble structures as a result of the formation of continuous nanosized CdS shells on single crystalline Cd(OH)2 particles. A comparative analysis of the experimental data was used to determine the kinetics of formation of nucleus-shell Cd(OH)2/CdS particles in the system.