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Your search keyword '"Lu, Xuemei"' showing total 40 results
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40 results on '"Lu, Xuemei"'

12. Evolutionary analysis and lineage designation of SARS-CoV-2 genomes

Author

Tang, Xiaolu, primary, Ying, Ruochen, additional, Yao, Xinmin, additional, Li, Guanghao, additional, Wu, Changcheng, additional, Tang, Yiyuli, additional, Li, Zhida, additional, Kuang, Bishan, additional, Wu, Feng, additional, Chi, Changsheng, additional, Du, Xiaoman, additional, Qin, Yi, additional, Gao, Shenghan, additional, Hu, Songnian, additional, Ma, Juncai, additional, Liu, Tiangang, additional, Pang, Xinghuo, additional, Wang, Jianwei, additional, Zhao, Guoping, additional, Tan, Wenjie, additional, Zhang, Yaping, additional, Lu, Xuemei, additional, and Lu, Jian, additional

Published
2021
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15. Enhanced fluorescence in nano-multiferroic fluoride substrates attached with silver nanoparticles

Author

Pengfei Zhao, Yaqiu Liang, Xu Panfeng, Zhongkun Liu, Kang Dawei, Tan Tianya, Xiaoxing Fan, Lu Xuemei, Xianmin Zhang, Jiwei Wang, and Liu Wen

Subjects
Materials science, Surface plasmon, Biophysics, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Photochemistry, 01 natural sciences, Biochemistry, Fluorescence, Atomic and Molecular Physics, and Optics, Silver nanoparticle, 0104 chemical sciences, chemistry.chemical_compound, chemistry, Excited state, Nano, Absorption (chemistry), 0210 nano-technology, Luminescence, Fluoride
Abstract

Nano-multiferroic BaMF4 (M = Mn, Mg) are synthesized in pure-phase by hydrothermal method as fluoride substrates. The Mn2+ stokes emission and the Tm3+ anti-stokes emission are shown in BaMnF4 and BaMgF4: Yb3+, Tm3+ nanocrystals under 465 and 975 nm excitation respectively. By depositing silver nanoparticles with the AgNO3/BaMF4 ratio of 0.01:1, the 347&365, 455, 480, 640 and 700 nm emissions of Tm3+ are enhanced 27, 21, 6, 3 and 2 times respectively, also the 700 nm emission of Mn2+ is enhanced 2 time. The above mentioned enhancement factor versus emission wavelength is accordance with the nano-silver absorption wavelength, indicating the surface plasmon coupled emission (SPCE) inducted by excited luminescent ions.

Published
2019

16. The modification of upconversion emissions by photonic band gap in β-NaYF4: Yb3+, Tm3+ inverse opal structures

Author

Wang Chun, Li Lina, Tan Tianya, Jiwei Wang, Yanan Ji, Mei Yong, Xu Panfeng, Chen Qiang, Lu Xuemei, and Yongsheng Zhu

Subjects
Materials science, Population, Biophysics, Inverse, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Biochemistry, Ion, chemistry.chemical_compound, Near ultraviolet, education, Photonic crystal, education.field_of_study, business.industry, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Photon upconversion, 0104 chemical sciences, chemistry, Optoelectronics, Polystyrene, 0210 nano-technology, business, Excitation
Abstract

Inverse opal photonic crystals (IOPCs) of β-NaYF4: Yb3+, Tm3+ with various photonic band gap (PBG) are prepared by the sol-gel method with polystyrene (PS) template technique. The modification of upconversion emissions is observed in IOPCs, where the near ultraviolet and blue emissions of Tm3+ ions are simultaneously suppressed and enhanced corresponding to the center and edge of PBG. Also they are alternately suppressed or enhanced resulting from the location change of the PBG. This is mainly attributed to the depression or enhancement effects occurring at the center or the edges of PBG, respectively. Moreover, the branch ratios and the excitation state processes involving suppressed transitions are modified by the increasing population on initial levels of suppressed transitions.

Published
2018

24. Effects of annealing pressure and Ar+ sputtering cleaning on Al-doped ZnO films

Author

Tan Tianya, Xiaoxing Fan, Lu Xuemei, Jiwei Wang, Mei Yong, Kang Dawei, and Xu Panfeng

Subjects
010302 applied physics, Materials science, Annealing (metallurgy), Doping, Ultra-high vacuum, Analytical chemistry, General Physics and Astronomy, 02 engineering and technology, Surfaces and Interfaces, General Chemistry, Conductivity, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Surfaces, Coatings and Films, X-ray photoelectron spectroscopy, Sputtering, Electrical resistivity and conductivity, 0103 physical sciences, Grain boundary, 0210 nano-technology
Abstract

Post-treatments of Al-doped ZnO films fabricated by sol-gel method were studied in condition of annealing in air, vacuum and protective ambient, as well as the follow-up Ar + sputtering cleaning. The effect of annealing pressure on resistivity of AZO films was investigated from 10 5 to 10 −4 Pa, where the resistivity decreased four orders of magnitude as the pressure decreased and approached to its minimum at 10 Pa. It was observed that the main decreasing of resistivity occurred in a very narrow range of middle vacuum (between 100 and 10 Pa) and high vacuum was dispensable. The XRD and XPS characterizations demonstrated that the radical increasing of oxygen vacancy, Zn interstitial and substitution of Al 3+ for Zn 2+ under middle vacuum were responsible for the significant enhancement of conductivity. The follow-up Ar + sputtering cleaning can further decrease the resistivity through removing the chemisorbed oxygen on film surface and grain boundaries, meanwhile fulfil the surface texture process, and thus improve both electrical and optical performances for applications.

Published
2016

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