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814 results on '"Li, Zhengquan"'

351. Direct Generation of Fine Bi2WO6 Nanocrystals on g‐C3N4 Nanosheets for Enhanced Photocatalytic Activity.

Author

Yin, Wenjie, Bai, Song, Zhong, Yijun, Li, Zhengquan, and Xie, Yi

Subjects
ELECTRIC generators, NANOCRYSTALS, HETEROJUNCTIONS, PHOTOCATALYSIS, IRRADIATION
Abstract

Abstract: Graphitic carbon nitride (g‐C3N4) coupled with Bi2WO6 is a promising Type II heterojunction, but it is still difficult to obtain uniform nanocomposites of these materials with the present assembly methods. Here we employ g‐C3N4 nanosheets saturated with Bi3+ ions to provide numerous and widespread nucleation sites for the growth of Bi2WO6 nanocrystals. As a result, g‐C3N4 nanosheets loaded with fine and controllable amount of Bi2WO6 nanocrystals are produced. The g‐C3N4/Bi2WO6 nanocomposites exhibit significantly enhanced photocatalytic activity for RhB degradation under visible‐light irradiation. Particularly, the g‐C3N4/70 % Bi2WO6 nanocomposite achieves the highest photocatalytic activity, and the average rate constant is almost 5 and 9 times higher than those of bare g‐C3N4 and Bi2WO6, respectively. Moreover, the composite exhibits high photocatalytic stability in cycling tests. [ABSTRACT FROM AUTHOR]

Published
2016
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355. Differential space-time network coding in MIMO two-way relay channel network.

Author

Jin, Xiaoping, Han, Xinqiang, Jin, Ning, Li, Youming, Li, Zhengquan, and Wang, Xiuming

Subjects
DIFFERENTIAL equations, LINEAR network coding, MIMO systems, TWO-way communication, WIRELESS sensor nodes, SCHEME programming language
Abstract

This paper focuses on noncoherent detection scheme for multiple-input multiple-output two-way relay channel network with two two-antennas source nodes and one single-antenna relay node. An orthogonal differential space-time network coding (ODSTNC) scheme based on relay detection and forward protocol is proposed. The proposed scheme combines space-time coding with network coding, and the differential modulation and detection are used in both multiple access stage and broadcast stage. The multiple-symbol differential detection is employed at the relay. The maximum likelihood decision and its low-complexity sphere decoding decision are given. The upper and lower bounds on the average symbol error probability for this system under differential binary phase shift keying (DBPSK) are derived, and a diversity order of 2 is confirmed to be achieved. The simulation results show that the ODSTNC scheme has good performance, and it is available for the applications of far distance signal transmission between two terminals where channel state information is unknown. Copyright © 2014 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2016
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368. Hydrothermal Synthesis of Highly Robust 2-D Layered Coordination Polymer of La

Author

Yang Ruyi, Li Zhengquan, Zheng Nengwu, Jin Xianglin, and Xu Haitao

Subjects
Plane (geometry), Coordination polymer, Inorganic chemistry, General Chemistry, Crystal structure, Electron, Spectral line, law.invention, chemistry.chemical_compound, Crystallography, chemistry, law, Hydrothermal synthesis, Electron paramagnetic resonance, Spin-½
Abstract

The crystal structure of the coordination polymer: [La(C8H5NO4)1.5H2O]n is reported, and some properties are characterized. It is interesting to observe 2-D layer-structures parallel to ac plane. The TAG reveals it’s thermal high stability and the EPR spectra show that there is no odd spin electron.

Published
2002

369. Rare Earth Ion Center in Distorted Square Anti-Prism Coordination Environment: A Novel Three-Dimensional Coordination Polymer with Channels

Author

Xu Haitao, Li Zhengquan, Jin Xianglin, Yang Ruyi, and Zheng Nengwu

Subjects
Prism (geometry), Crystallography, chemistry.chemical_compound, Hydrogen bond, Chemistry, Coordination polymer, Inorganic chemistry, Molecule, Hydrothermal synthesis, Center (algebra and category theory), General Chemistry, Square (algebra), Ion
Abstract

The hydrothermal synthesis and the structure of the coordination polymer [La2(ATPT)3·(H2O)5] (H2O)2 (ATPT=2-aminoterephthalic acid) were reported. The Rare-earth ion center was in the distorted square anti-prism coordination environment. These carboxyl groups linking La3+ ion centers engendered one-dimension channels with pending groups. Guest water molecules in these channels joined these pending groups via hydrogen bond.

Published
2002

387. Facile synthesis of Ag@SiO core-shell nanowires on large scale.

Author

Li, Fang, Zhao, Yu-Ling, Dai, Wei, Chen, Jing, Li, Zhengquan, and Qian, Haisheng

Subjects
SILVER compounds, SYNTHESIS of nanowires, NANOSTRUCTURES, ELECTRIC properties of nanoparticles, CATALYSIS, MICROFABRICATION
Abstract

One dimensional silver nanowires including core-shell nanostructures have attracted extensive attention for important application in catalysis, electronics, photonics, and information storage. Here, we first report a facile solution process for fabrication of Ag/SiO core-shell nanowires. The phase and size of the samples were investigated by X-ray power diffraction analyses, field-emission scanning electron microscopy and transmission electron microscopy; respectively. The Ag/SiO core-shell nanowires are with 200-300 nm in diameter, tens of micrometers in length and several nanometers for the shell thickness. The detailed reaction and shape evolution process of core-shell structures have been studied. This facile solution approach would be extended to produce new hybrid materials with potential applications. [ABSTRACT FROM AUTHOR]

Published
2015
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388. Simultaneous formation of silica-protected and N-doped TiO2 hollow spheres using organic–inorganic silica as self-removed templates.

Author

Li, Lei, Zhou, Shiqi, Chen, Erjian, Qiao, Ru, Zhong, Yijun, Zhang, Yong, and Li, Zhengquan

Abstract

Synthesis of N-doped TiO2 hollow spheres with a small grain size, large surface area and high degree of crystallinity is favorable to achieve an overall high photocatalytic activity. But traditional synthetic approaches generally involve many tedious steps and are time-consuming. Here we present a facile method to synthesize N-doped TiO2 hollow spheres using organic silane-doped silica nanoparticles as templates. The organic–inorganic silica can be simultaneously etched during the deposition of TiO2 shell to create a thin silica layer on the TiO2 surface. Such a thin silica layer can efficiently protect the TiO2 nanocrystals from growing larger during high-temperature calcination. At the same time, the organic silane can serve as a nitrogen source to be doped in the TiO2 shell. The developed silica-protected and N-doped TiO2 hollow spheres can be directly employed as photocatalysts without SiO2 etching and show obvious light utilization in both UV and visible bands. [ABSTRACT FROM AUTHOR]

Published
2015
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