Debao Wang

Synthesis of closed PbS nanowires with regular geometric morphologies

Closed PbS nanowires with regular geometric morphologies (ellipse and parallelogram shape) were synthesized in the presence of poly[N-(2-aminoethyl)acrylamide] in ethylenediamine/H2O (3∶1, v/v) solvent at 110–150 °C.

Synthesis of ITO nanowires and nanorods with corundum structure by a co-precipitation-anneal method

Tin-doped indium oxide (ITO) nanowires and nanorods were synthesized by a co-precipitation-anneal process. Both the nanowires and the nanorods had nearly uniform diameter of ca. 60 nm. The nanowires had long and straight morphology with length up to several micrometers. Moreover, the products were the ITO with corundum structure.

Polyol-mediated preparation of Bi2S3 nanorods

Single crystalline Bi2S3 nanorods have been prepared using a polyol method through reaction between bismuth nitrate and thiourea. The product was characterized using XRD, TEM and HRTEM. Side-by-side growth, dendritic growth and haystack form growth of Bi2S3 nanorods were observed in the samples grown in different alkaline media. The mechanism for the growth of Bi2S3 nanorods was discussed.

Seed-mediated growth approach to shape-controlled synthesis of Cu2O particles.

With glucose as reducing agent, Cu2O particles with different size and morphology were synthesized selectively by a seed-mediated growth approach. The major advantage of this process is that Cu(II) cannot be reduced to Cu metal. The size of the Cu2O particles can be controlled by changing the Cu(II) concentration in colloid solution. Square-shaped Cu2O particles (20-700 nm in diameter) were obtained in the presence of PEG 400, and polygonal-shaped Cu2O particles (approximately 1000 nm) were observed upon using triblock copolymer as modifier, while sphere-shaped Cu2O particles with a diameter of 400-700 nm were obtained in the absence of a modifier.

Synthesis of nanocrystalline PbSe by sonolysis of Pb(NO3)2 in non-aqueous solvent

Abstract Nanocrystalline PbSe was synthesized via a sonochemical reaction of Pb(NO3)2 with elemental Se in ethylenediamine under ambient conditions. The sample was characterized by X-ray powder diffraction (XRD), transmission electron microscope (TEM) and elemental analysis. XRD patterns showed that phase-pure PbSe was produced. The PbSe particles were spherical and about 30 nm in size as indicated by TEM observations. The influence of ultrasound and solvent was also discussed.

Preparation of corundum structure Sn-doped In2O3 nanoparticles via controlled co-precipitating and postannealing route

Abstract Corundum structure Sn-doped In2O3 nanoparticles were first synthesized by a controlled co-precipitating and postannealing method. X-ray powder diffraction (XRD), electron diffraction (ED), transmission electron microscopy (TEM), and X-ray photoelectron spectrometer (XPS) were used to characterize the products, indicating that the products were well-crystallized Sn-doped In2O3 nanoparticles with corundum structure. The particles were spherical in shape with sizes in the range of 10–20 nm.

Growth of Sb2Se3 whiskers via a hydrothermal method

Abstract The growth of crystalline Sb 2 Se 3 whiskers has been conducted via a hydrothermal process. It was found that the organic additives added to the hydrothermal system had important influence on the growth behavior of Sb 2 Se 3 whiskers. The structure features of Sb 2 Se 3 whiskers were characterized by scanning electron microanalyzer and X-ray diffraction (XRD) techniques. The growth mechanism was discussed and the relationship between crystal morphologies and the crystal structure of Sb 2 Se 3 were discussed.

Self-template route to CdS hollow spheres and in situ conversion to CdS/Ag2S composite materials

Abstract Uniform CdS hollow spheres were synthesized via thiourea reacting with Cd 2+ through self-template route. When these spheres adsorbed silver nitrate solution, they in situ transformed to sulfide and formed CdS/Ag 2 S composite materials. Both CdS and Ag 2 S photoluminescence emissions were observed simultaneously.

Formation of antimony nanotubes via a hydrothermal reduction process

Semimetallic antimony nanotubes were synthesized via a hydrothermal reduction method at 120°C using zinc powder as the reducing agent. X-ray powder diffraction and energy dispersive x-ray analysis showed that the as-prepared sample was elemental antimony. High-resolution transmission electron microscopy characterization indicated that the walls of the antimony nanotubes were constructed with (012) crystal planes of rhombohedral antimony. A possible mechanism for the formation of antimony nanotubes is proposed.

Growth of Bi2S3 skeleton crystals with three-dimensional network morphologies

Abstract Skeleton crystals of Bi 2 S 3 have been prepared via a solvothermal route using BiCl 3 and anhydrous sodium sulfite as starting reagents. Transmission electron microscopy studies showed that the rod-based skeleton crystals have three-dimensional network morphologies. The influence of reaction time and the temperatures has been discussed. A possible growth mechanism was proposed.