Yurui Zhu

A convenient ultraviolet irradiation technique for in situ synthesis of CdS nanocrystallites at room temperature

CdS nanocrystallites with cubic or hexagonal phase structures have been synthesised at room temperature via precipitation of Cd2+ ions with homogeneously released S2− ions, generated from the decomposition of thio-acetamide by ultraviolet irradiation reduction.

Preparation and studies of Ag–TiO2 hybrid nanoparticles of core-shell structure

Abstract Ag–TiO 2 hybrid nanoparticles of core-shell structure were synthesized by an ultraviolet irradiation reduction technique. Phase analysis of the product obtained was carried out by X-ray and electron diffraction patterns. The morphology of the hybrid particles was studied by TEM images. The variation of UV-Vis absorption spectra of the silver colloidal solution with incorporation of TiO 2 was observed. A strong surface-enhance Raman scattering (SERS) and Raman blue shift of TiO 2 was found in Ag–TiO 2 hybrid nanoparticles due to the amalgamation of Ag.

A novel ultraviolet-irradiation route to CdS nanocrystallites with different morphologies

Abstract A novel ultraviolet-irradiation technique has been successfully developed to the synthesis of CdS nanocrystallites with different morphologies using poly(vinyl alcohol) (PVA) as protecting agent. The produced CdS samples may exhibit spherical, disk-like and wire-like morphologies by adjusting the concentrations of CdSO 4 ·8/3H 2 O and thioacetamide (TAA). It is found that some nanotubes coexist in the sample of the CdS nanodisk, indicating it is possible to synthesize CdS nanotubes by the present approach. This method may extend to synthesize other metal sulfide nanocrystallites, nanowires, nanodisks, and even nanotubes.

The preparation, surface modification, and characterization of metallic α-Fe nanoparticles

Abstract α -Fe nanoparticles were prepared by reduction of Fe 2+ using potassium borohydride in a simple ethanol/water system in the presence of surfactant. The in-situ modification of particles was carried out by taking advantage of a modifying solution containing Ni 2+ . The structure and size of the particles were investigated by X-ray diffraction (XRD), X-ray photoelectron spectrum (XPS), transmission electron microscopy (TEM) and electron diffraction (ED). Results showed that the in-situ electrochemical reaction between α-Fe nanoparticles and Ni 2+ resulted in the formation of stable multilayer composite nanostructure. The cores of composite nanostructure were α-Fe.

Preparation and characterization of Mg(OH) 2 nanorods by liquid–solid arc discharge technique

Abstract The Mg(OH)2 nanorods with diameters of ca. 8–10 nm and lengths of more than 250 nm have been prepared by a novel liquid–solid arc discharge technique. X-ray diffraction (XRD) showed that the Mg(OH)2 nanorods were well-crystallized with the hexagonal structure. The structure features were also analyzed by TEM, HRTEM, and FTIR. Based on the investigation of the influence of current density, discharge time and pH of the electrolyte, the possible growth mechanism of the Mg(OH)2 was discussed.

Convenient microemulsion route to star-shaped cadmium sulfide pattern at room temperature

Abstract Star-shaped CdS patterns, which were composed of rod-like nanoparticles with diameters of 4–7 nm and lengths ranging from 150 to 200 nm, were successfully prepared by a convenient microemulsion technique at room temperature. It was found that the hydrophobic carbon chain of surfactant played an important role in controlling the morphology of the product. The present convenient microemulsion method is relatively mild and low toxic. It may provide a new route to the production of other metal sulfide patterns at room temperature.

Synthesis and characterization of NiP-TiO2 ultrafine composite particles

Ultrafine particles TiO2-NiP were successfully synthesized by an electroless plating technique. TEM and XRD were used to characterize the particles’ morphology and composition.

A novel ultraviolet irradiation technique for fabrication of polyacrylamide-metal (M = Au, Pd) nanocomposites at room temperature

Polyacrylamide (PAM)–metal (M = gold, palladium) nanocomposites with metal nanoparticles homogeneously dispersed in the polymer matrix have been prepared via a novel ultraviolet irradiation technique at room temperature, which is based on the simultaneous occurrence of photo-reduction formation of the colloidal metal particles and photo-polymerization of the acrylamide (AM) monomer. The UV–vis absorption spectra and TEM were employed to characterize the M-PAM nanocomposites by different irradiation times. The average sizes of the colloidal gold and palladium particles dispersed in the nanocomposites were calculated by XRD patterns and TEM images. The present method may be extended to prepare other metal–polymer hybrid nanocomposite materials.

Preparation of metal or alloy sulfide nanoparticles by electrochemical deposition

ZnS and (PbSn)S nanoparticles were successfully fabricated by an electrochemical deposition with alternating current circuit (EDACC). The mechanism of product formation is presented in this paper. It is obvious that nanoparticles of many metal sulfides or alloy sulfides can be synthesized by this method.

Preparation of nanocrystalline silver by the method of liquid-solid arc discharge combined with hydrothermal treatment

Abstract A technique of liquid–solid arc discharge combined with hydrothermal treatment in the presence of surfactant has been successfully developed to prepare nanocrystalline noble metallic Ag with an average particle size of about 10 nm. The products were characterized by adsorption spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and microscope photodensitometer measurements. The influence of preparation conditions on the size of Ag particles was investigated. The appearance of Ag nanowires in the process was observed.