Jinghui Zeng

Preparation of nickel nanopowders in ethanol-water system (EWS)

PVP-protected nanoscale Ni powders are prepared in ethanol-water system (EWS). The product was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). X-ray photoelectroscopy (XPS) was utilized to determine the surface state of the sample. The product can be isolated in solid state and stabilized for months. The powders are dispersed homogeneously shown in TEM figure.

Novel bismuth nanotube arrays synthesized by solvothermal method

Abstract Novel bismuth nanotube arrays have been successfully synthesized by a solvothermal method through the reduction of bismuth oxide (Bi 2 O 3 ) by ethylene glycol (EG). The productions were characterized by XRD, TEM and HRTEM. The diameter of the nanotubes is about 3–6 nm and length is up to 500 nm. The possible growth mechanism of Bi nanotubes was discussed.

A novel morphology controllable preparation method to HgS

Mercury sulfide was synthesized by a controllable solvothermal method. X-ray diffraction, transmission electron microscopy and X-ray photoelectronic spectrum were used to characterize as-prepared mercury sulfides. Both hexagonal and cubic phase of mercury sulfide can be synthesized via this method. The phase transition of the two phases and the mechanism of morphology controlling in different solvents were studied. The results show that in the solvothermal reaction higher temperature is favorable for the phase transition from metacinnabar to cinnabar and polyamides play an important role in the forming of nanorods.

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.

Solvothermal synthesis of the ternary semiconductor AInS2 (A=Na, K) nanocrystal at low temperature

Abstract Lamella and parallelogram thin flake NaInS 2 , KInS 2 nanocrystals were prepared by the reaction between Na 2 S·9H 2 O or K 2 S and InCl 3 ·4H 2 O via solvothermal method at low temperature. The result of electron diffraction (ED) analysis confirmed that lamella of NaInS 2 nanocrystal grows along the directions perpendicular to the 〈0xa00xa01〉 zone axis. The reaction temperature played a key role in the formation of NaInS 2 nanocrystal. Meanwhile, the process of NaInS 2 nanocrystal growth was discussed.

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

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

Synthesis of NiS2-xSex solid solution via an ultrasonic solvothermal route

Abstract NiS 2− x Se x solid solution has been successfully prepared via an ultrasonic solvothermal route. The products were characterized by X-ray diffraction, ICP-AES and X-ray photoelectron spectroscopy. It has been found that the lattice parameter a follows a Vegard law with the selenium content x Se . The effects of ultrasonic and solvent on synthesizing NiS 2− x Se x solid solution were discussed. By comparing the Se molar fraction in the reagents to the selenium content in the samples, the formation mechanism of NiS 2− x Se x solid solution was proposed. Scanning electron microscopy images indicate that the products exhibit different morphologies corresponding to different compositions.

Fabrication of mesoporous CdS nanorods by chemical etching

One-dimensional CdS nanocrystallites were used as precursors for preparation of mesoporous CdS nanorods through an ion-exchange process at room temperature. The results from x-ray photoelectron spectroscopy, transmission electron microscopy, energy-dispersive x-ray analysis, and x-ray powder diffraction techniques showed that Ag + did not affect the electronic structure of CdS or cause the disorder of crystal structure although the product contained a considerable amount of Ag 2 S. The visible absorption of Ag 2 S nanoparticles in the mesoporous structure led to the result that the intensities of Raman scattering peaks of the mesoporous nanorods were weaker than those of CdS initial nanorods.

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.