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Start Over Author "Zhang Sheng" Journal advanced materials research
266 results on '"Zhang Sheng"'

1. Photoelectric Properties of the Doped Silicon with Carbon Family Elements

Author

Zhang Sheng Shi, Peng Fei Ji, Chong Wang, Jie Yang, and Yu Yang

Subjects
Materials science, Silicon, business.industry, Doping, General Engineering, Nanocrystalline silicon, chemistry.chemical_element, Strained silicon, Nanotechnology, Photoelectric effect, Absorbance, chemistry, Microelectronics, Optoelectronics, business, Carbon
Abstract

Today, silicon material plays an irreplaceable role in microelectronic of the information industry, however it don`t have a good emission characteristics. In order to explore the emission character, we calculated the electrons structure, absorbance of silicon doped with C, Si, Ge, Sn and Pb by the first-principles methods.

Published
2013

2. Effect of Surface Passivation on Optical and Electronic Properties of Ultrathin Single-Layer Silicon Nanosheets Compared to Bulk Silicon

Author

Tao Pan, Yu Yang, Zhang Sheng Shi, Chong Wang, and Peng Fei Ji

Subjects
Materials science, Passivation, Silicon, business.industry, Binding energy, General Engineering, chemistry.chemical_element, Electronic structure, Pseudopotential, chemistry, Computational chemistry, Density of states, Optoelectronics, Density functional theory, Electronic band structure, business
Abstract

The binding energy, electronic structure and optical properties of ultrathin single-layer silicon nanosheets passivated with H-, H3C-, H2-N and HS-cluster were calculated using density functional theory based on plane-wave ultra-soft pseudopotential respectively. Firstly, the most stable configuration was selected from passivated configurations according to the lowest energy principle after calculating their total energies. Secondly the density of state and the band structure of the different passivated systems were calculated. It was found that different passivation clusters could affect the forbidden band, furthermore the passivated HS-cluster could notably decrease the width of forbidden band through electron transfer. Finally, the light absorption and reflection properties were also investigated. All results were conducive to the development of silicon-based optoelectronic devices.

Published
2013

3. Research on Active Selenium Polysaccharide in Artemisia Argyi

Author

Chi Zhang, Hui Zhang Sheng, Yan Wu Hai, and Ping Liu Xin

Subjects
inorganic chemicals, Active ingredient, chemistry.chemical_classification, Antioxidant, Artemisia argyi, Autoxidation, medicine.medical_treatment, General Engineering, food and beverages, chemistry.chemical_element, Polysaccharide, chemistry.chemical_compound, chemistry, Biochemistry, Pyrogallol, medicine, Food science, Selenium, Salicylic acid
Abstract

In this article, the selenium content of selenium polysaccharide and its antioxidant activity in vitro in Artemisia argyi has been studied. The double tracts atomic fluorescence spectrometry is used to detect the total selenium content in the sample and that of selenium polysaccharide in the active ingredient of the sample. The salicylic acid method and pyrogallol autoxidation method are used to detect the scavenging activity of selenium polysaccharide on hydroxyl radicals and superoxide anion. which grows in Yutangba, a selenium mining area of Enshi—“City of Selenium in China”. Through a comparative experiment with Artemisia argyi growing in non-selenium mining areas, the results have shown that the antioxidant ability of selenium polysaccharide in Se-enriched Artemisia argyi is significantly stronger than that of pure polysaccharide. Therefore, Se-enriched Chinese herbal medicine is a good natural antioxidant, which is worthy of exploitation and utilization.

Published
2013

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