Yuanfang Liu

Hydrothermal synthesis of square thin flake CdS by using surfactants and thiocarbohydrate

Abstract In this paper, cadmium sulfide (CdS) square thin flakes were prepared from the aqueous solution of Cd(NO3)2 and thiocarbohydrate at 180°C by using surfactants. The resulting samples were characterized by powder X-ray diffraction (XRD) and transmission electron micrography (TEM). The particle prepared without surfactants has a spherical shape and the average size is about 16nm. The products fabricated in some surfactants have a square thin plate shape which may stack on each other to form a laminar structure. Electron diffraction (ED) indicated the samples were well crystallized.

Formation of semiconductor Cu2−xSe rod-like crystals through a solvothermal reaction

Micron-sized rod-like crystals of Cu{sub 2-x}Se were successfully grown for the first time by a hydrothermal reaction from CuCl{sub 2}{center_dot}2H{sub 2}O and Se powder at 60 deg. C for 2 h. X-ray powder diffraction patterns (XRD), X-ray photoelectron spectra (XPS), scanning electron microscopy (SEM) images, and transmission electron microscope (TEM) images show that the product is cubic Cu{sub 2-x}Se rod-like crystal and well crystallized. Hydrazine hydrate was used as solvent in the process and played an important role in the formation of rod-like Cu{sub 2-x}Se crystals. The optical properties of Cu{sub 2-x}Se, such as absorption spectra, photoluminescence (PL) spectra, and Raman spectrum are also reported for the first time.

Nanocomposite of CdS particles in polymer rodsfabricated by a novel hydrothermal polymerization and simultaneoussulfidation technique

A hydrothermal polymerization and simultaneous sulfidation (HPSS) process and the mechanism for the fabrication of one-dimensional (1-D) nanocomposites of well dispersed CdS nanoparticles self-assembled in the polymer nanorods is presented.

Morphology development of CdS/PVAc composite from spheres to rods

Abstract CdS/poly(vinyl acetate) (PVAc) composite was prepared by a hydrothermal polymerization and simultaneous sulfidation (HPSS) process. X-ray diffraction and transmission electron microscopy were used to characterize the products and study the morphology development. Composite spheres were prepared in the early stage of the process. Then the spheres stick with each other to form peanut-shaped morphology. Finally, composite rods are fully developed from the composite spheres. Fourier transform infrared spectroscopy was used to characterize the PVAc in the composite. Ultra violet–visible spectra were also recorded and the analysis suggests that the as-prepared CdS in the composite are quantum sized.

Aqueous ammonia route to Cu1.8S with triangular and rod-like shapes

Abstract Digenite crystalline Cu 1.8 S was synthesized through solvothermal reaction of CuCl 2 ·2H 2 O and sulfur powder at low temperature in aqueous ammonia. X-ray powder diffraction (XRD) pattern indicates Cu 1.8 S is cubic phase. Transmission electron microscope (TEM) shows Cu 1.8 S obtained at 160 °C is triangular and Cu 1.8 S formed at 140 °C is rod-like. X-ray photoelectron spectrum (XPS) was used to determine the composition of as prepared products. The influence of solvent and reaction temperature was investigated. Raman spectrum of Cu 1.8 S was recorded.