Yingliang Liu

Luminescence Properties of a Pb2 + Activated Long-Afterglow Phosphor

Luminescence properties of CdSiO 3 :Pb 2+ long-afterglow phosphor, including photoluminescence, fluorescence lifetime, long-afterglow decay curve, and thermostimulated luminescence spectra, are investigated in this paper. Photoluminescence of the synthesized phosphor shows a single intense Pb 2+ -related broadband emission located at 498 nm. Moreover, the Pb 2+ -related broadband emission still exists for more than 2 h, even after the ultraviolet irradiation source has been removed. Both the fluorescence and long-afterglow decay lifetime of the Pb 2+ ions contain a fast decay component and slow decay one. Thermo-stimulated luminescence curve study indicates that the incorporation of Pb 2+ ions into CdSiO 3 host produces two suitable dense trapping centers at 0.55 and 0.43 eV, which is the origin of the long-afterglow phenomenon in this kind of material at room temperature. This finding has enlarged the activator of the family of long-afterglow phosphors available.

Simple Shape-Controlled Synthesis of Carbon Hollow Structures

This study reports a simple method for the controlled synthesis of uniformly shaped carbon hollow structures by an ethanol-assisted thermolysis of zinc acetate. The experimental evidence reveals that the generated zinc oxide nanostructures act as in-situ templates to form the carbon hollow structures. The morphologies, including the shell thickness, cavity size, and aspect ratio, can be controlled by the reaction time and the heating procedure, and hollow nanospheres, nanocapsules, nanorods, and microtubes can be obtained. Experimental results show that the as-synthesized carbon hollow structures exhibit excellent thermal and structural stability to temperatures as high as 1200 °C.

Structure and synergetic antibacterial effect of zinc and cerium carried sodium zirconium phosphates

Zinc and cerium carried zirconium phosphates (Zn-Ce/ZrPs) were prepared by exchanging zinc and cerium cations into sodium zirconium phosphate (NaZrP) through the ion-exchange method and characterized by X-ray diffraction(XRD), energy dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM). Furthermore, the specific surface area, zeta potential and antibacterial activity were tested. The results showed that Zn-Ce/ZrPs were with hexagonal crystal system, and the surface area of Zn-Ce/ZrPs increased much more than that of NaZrP. Zn-Ce/ZrPs showed obvious synergetic antibacterial effect, and have the potential to be used as antibacterial agents in environmental control.

Synthesis of Hollow-Cone-Like Carbon and Its Application as Support Material for Fuel Cells

A simple solvothermal method is employed to prepare a hollow conelike carbon (HCC) with an open hemline. The HCC was characterized by transmission electron microscopy, X-ray diffraction, N 2 sorption, Raman spectroscopy, and electrochemical techniques. Electrochemical characterizations show that activated HCC has improved corrosion resistance over Vulcan XC-72 carbon black. Platinum supported on this activated HCC was prepared and evaluated for methanol oxidation in acidic media for the first time. Pt/HCC electrocatalyst exhibits higher activity for methanol oxidation compared to Pt/C at the same Pt loading. It is believed that open, hollow HCC acts as a structure unit and facilitates the mass diffusion and transfer inside the carbon cones due to larger orifices. The unique structure and higher corrosion resistance makes the Pt/HCC electrocatalyst a potential candidate to be used in direct methanol fuel cells.

Electrodeposition of Tm-Co Alloy Films in Dimethylsulfoxide

The conductivity of three thulium (Tm) salts has been studied in dimethylsulfoxide (DMSO) at 298 K. Tm(NO 3 ) 3 has strong electrolyte properties in DMSO. Cyclic voltammetry has been used to investigate the electrochemical behavior of the Tm 3+ ion in 0.01 mol L -1 Tm(NO 3 ) 3 -0.1 mol L -1 LiClO 4 -DMSO system on the Pt electrode at 299 K. The experimental results of cyclic voltammetry indicate that the reduction of the Tm 3+ ion is an irreversible process. The transfer coefficient and the diffusion coefficient of Tm 3+ ion have been measured. In a nonaqueous system, the surface of Tm-Co alloy films prepared by the potentiostatic deposition technique is uniform, adhesive, compact, and showed a metallic luster. Tm-Co alloy films are amorphous, as proven by X-ray diffraction spectrometry. Tm-Co alloy films have soft magnetic property at 293 K. This kind of rare earth film prepared from organic solvent could have the potential application as a magnetic material.

Synthesis and characterization of graphitic carbon with hollow structures

Abstract Graphitic carbon with a hollow structure (GHS) was hydrothermally prepared at 600 °C by a one-pot method by the pyrolysis of ethanol, with cobalt acetate as catalyst. The characteristics of the samples were investigated by X-ray diffraction, scanning and transmission electron microscropy and Raman spectroscopy. Results show that as-synthesized samples had hollow structures with high graphitization degree. A possible mechanism for GHS formation by the method is proposed.