Showing papers by "Guozhen Shen published in 2004"
TL;DR: In this article, the formation and evolution of PbWO4 nanostructures with bundles rodlike, ellipsoidlike, and spherelike prepared at different media conditions were studied by powder X-ray diffraction pattern, field emission scanning electron microscopy, and transmission electron microscope, and the results reveal that all these samples showed similar features with emissions at 480 ∼ 510 nm but different luminescence intensity.
Abstract: Anionic surfactant-AOT-microemulsions-assisted formation and evolution of PbWO4 nanostructures with bundles rodlike, ellipsoidlike, and spherelike prepared at different media conditions were studied by powder X-ray diffraction pattern, field emission scanning electron microscopy, and transmission electron microscopy. The possible mechanisms for the formation of PbWO4 samples in series of microemulsion systems were discussed. Various comparison experiments show that several experimental parameters, such as the AOT concentration, the water content, and reaction temperature play important roles in the morphological control of PbWO4 nanostructures. Room-temperature photoluminescence of PbWO4 samples with different morphologies has also been investigated and the results reveal that all these samples showed similar features with emissions at 480 ∼ 510 nm but different luminescence intensity.
104 citations
TL;DR: The tin sulfides compounds SnS and SnS2 nanoflakes were prepared by the microwave-assisted polyol synthetic method as mentioned in this paper, and as-prepared nanoscale flakes were characterized by X-ray powder diffraction, transmission electron microscopy, selected area electron diffraction and Raman spectra.
92 citations
TL;DR: In this paper, a simple and convenient solution route at low temperature from shuttle-like CuO crystals was used to synthesize special morphologies, such as trepang-like morphology.
54 citations
TL;DR: In this article, a novel chemical synthetic route was developed to prepare ZrC hollow nanospheres at 600°C, using ZrCl4 and C6Cl6 as source materials, and metallic Na as the reductant.
28 citations
TL;DR: A facile and selective self-sacrificing template-like conversion process has been developed to produce both high-quality flower-like patterns of radially aligned Bi2(Se,S)3 nanorods and Bi2Se3 nanoflakes at low temperature as mentioned in this paper.
Abstract: A facile and selective self-sacrificing template-like conversion process has been developed to produce both high-quality flower-like patterns of radially aligned Bi2(Se,S)3 nanorods and Bi2Se3 nanoflakes at low temperature. In this process, the patterns of radially aligned Bi2S3 nanorod precursors act as both the source materials and template to confine the growth of final products. The possible growth mechanism was discussed based on the experiments. This novel radially aligned morphology may find uses in a variety of areas such as the fabrication of advanced electronic and opto-electronic nanodevices.
20 citations
TL;DR: ZrS3 nanocrystallites have been synthesized via a solvothermal route by the reaction between ZrCl4 and thiourea at relatively low temperature.
17 citations
TL;DR: In this paper, the authors reported the rapid synthesis of disk-like (ZnSe)2·EN precursor via a simple and convenient polyol method, which resulted in the formation of ZnSe crystals with unique quasi-network structure.
Abstract: In this paper, we reported the rapid synthesis of disklike (ZnSe)2·EN precursor via a simple and convenient polyol method. Annealing the precursor in argon stream at 500 °C resulted in the formation of ZnSe crystals with unique quasi-network structure. The obtained samples were characterized by powder x-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, infrared absorbance spectra, and thermogravimetric analysis. The influence of PEG200 on the final products in the system was also discussed.
6 citations
TL;DR: In this paper, a simple and efficient technique for the assembly of carbide nanostructures at low temperature was developed, such as SiC, TiC, ZrC, B4C, Mo2C nanowires, hollow nanospheres, nanocables, or nanoparticles.
Abstract: We have developed a simple and efficient technique for the assembly of carbide nanostructures at low temperature, such as SiC, TiC, ZrC, B4C, Mo2C nanowires, hollow nanospheres, nanocables, or nanoparticles. The morphology can be efficiently assembled by verifying the experimental parameters, such as reaction temperature, source materials, or using catalyst. The growth of carbide hollow nanospheres (SiC, TiC, ZrC) may be explained by the template-confined effect of the intermediate carbon hollow spheres, while the growth of SiC nanowires and nanocables are controlled by the VLS mechanism and TiC, ZrC nanowires by the template-confined effect of the intermediate carbon nanotubes.
6 citations
TL;DR: In this article, submicron Se and Te rod-like crystals were successfully synthesized via a rapid polyol process by refluxing Na2EO3 (E Se, Te) and (NH3)2S2O3 in ethylene glycol at 180°C for 0.5h under vigorous stirring.
5 citations