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Zhanjiang, China

Song X.,South China Normal University | Song X.,Universities of Guangdong | Song X.,Zhanjiang Normal College | Li J.,South China Normal University | And 2 more authors.
Chinese Journal of Organic Chemistry | Year: 2010

As a kind of α,β-unsaturated butyrolactone, 2(5H)-furanone is so reactive in lots of reactions that it has been used extensively in organic synthesis, especially, when a halogen atom is attached to the C=C unsaturated bond. According to the different reaction points, the recent advance in reactions of 2(5//)-furanone with nucleophiles containing nitrogen to give cyclic derivatives with β-substituent, α,β-disubstituents or γ-substituent via Michael addition, tandem Michael addition-elimination, dipolar cycloaddition or palladium-catalyzed cross-coupling reactions is reviewed. Source

Zhang J.,Zhanjiang Normal University | Zhang J.,Universities of Guangdong | Xue S.,Zhanjiang Normal University | Xue S.,Universities of Guangdong | And 2 more authors.
Journal of Semiconductors | Year: 2010

The feasibility of a new fabrication route for N and Ga codoped p-type ZnO thin films on glass substrates, consisting of DC sputtering deposition of Zn3N2:Ga precursors followed by in situ oxidation in high purity oxygen, has been studied. The effects of oxidation temperature on the structural, optical and electrical properties of the samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), optical transmittance and Hall effect measurements. The results were compared to a control film without Ga. XRD analyses revealed that the Zn3N 2 films entirely transformed into ZnO films after annealing Zn 3N2 films in oxygen over 500 °C for 2 h. Hall effect measurements confirmed p-type conduction in N and Ga codoped ZnO films with a low resistivity of 19.8 Ω cm, a high hole concentration of 4.6 × 1018 cm-3 and a Hall mobility of 0.7 cm2/(Vs). These results demonstrate a promising approach to fabricate low resistivity p-type ZnO with high hole concentration. © 2010 Chinese Institute of Electronics. Source

Li D.,Zhanjiang Normal University | Li D.,Guangdong University of Technology | Zhang J.,Zhanjiang Normal University | Zhang J.,Universities of Guangdong | And 6 more authors.
Rare Metals | Year: 2011

The nitrogen-doped TiO 2 thin films were prepared on glass substrate by an improved ultrasonic spray pyrolysis device with butyl titanate as the titanium source and ammonia as the nitrogen source. The surface morphology, crystal structure and optical properties of the resulting films were characterized by SEM, XRD and UV-VIS spectroscopy, respectively. The results show that N-doped TiO 2 films have a more uniform and compact surface, the particle size trends to become smaller and then larger with the increasing amount of doping nitrogen. All the thin films belong to polycrystalline anatase structure and have a well visible light responsiveness with N doped. The photocatalytic activity and hydrophilic properties were investigated under ultraviolet irradiation. The degradation rate for methylene blue solution can reach 94.0% after 3 h under ultraviolet irradiation. The hydrophilic test shows that the hydrophilicity of TiO 2 thin films can be improved by doping nitrogen to some extent. © The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2011. Source

Zou C.W.,Universities of Guangdong | Zhang J.,Universities of Guangdong | Xie W.,Universities of Guangdong | Shao L.X.,Universities of Guangdong | Fu D.J.,Wuhan University
Journal of Alloys and Compounds | Year: 2011

Ti-Al-N coatings were deposited on Si (1 1 1) and WC substrates by combined cathodic arc middle-frequency magnetron (MF) sputtering under a Ti arc power of 10 kW and with different Al MF targets currents. X-ray diffraction patterns (XRD) showed that the Ti-Al-N coatings were polycrystallize with a preferred (1 1 1) orientation at 2θ = 43.7°. The (1 1 1) diffraction showed a decrease in peak intensity but a increase in FWHM values with the increasing of Al contents. Nano-meter sized TiN crystal grains distinguished by the lattice fringe contrast were verified by plan-view transmission electron (TEM) and selected area electron diffraction (SAED) images. With the increasing of MF sputter currents from 5 to 20 A, the Al contents in the Ti-Al-N coatings monotonically increased from 4.8 to 10.8 at.%, whereas the N and O contents were nearly constant. The hardness of the Ti-Al-N coatings was in the range of 23-32 GPa, and the Young modulus values were in the range of 420-540 GPa. © 2010 Elsevier B.V. All rights reserved. Source

Ma L.,Zhanjiang Normal University | Ma L.,Universities of Guangdong | Chen W.-X.,Zhejiang University | Xu L.-M.,Zhanjiang Normal University | And 5 more authors.
Ceramics International | Year: 2012

Uniform MoS2 nanosheets/C hybrid microspheres with mean diameter of 320 nm have been successfully synthesized via a facile one-pot hydrothermal route by sodium molybdate reacting with sulfocarbamide in d-glucose solutions. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). XRD patterns showed that the MoS2 was kept as a two-dimensional nanosheet crystal and C was retained as amorphous even after their annealing treatment at 800 °C. TEM and SEM images indicated that the MoS2 nanosheets were uniformly dispersed in the amorphous carbon. The experiment results also revealed that the appropriate amount of d-glucose had an obvious effect on the formation of uniform MoS2 nanosheets/C hybrid microspheres. A possible formation process of MoS 2 nanosheets/C hybrid microspheres was preliminarily presented. © 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved. Source

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