Y. H. Tang
Hunan University
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Publication
Featured researches published by Y. H. Tang.
Journal of Applied Physics | 2006
L. Z. Pei; Y. H. Tang; Yiqin Chen; Chi Guo; Xiao-Fei Li; Y. Yuan; Yong Zhang
One-dimensional SiC nanotubes with small diameter without metallic catalysts were prepared under supercritically hydrothermal conditions. The SiC nanotubes were characterized by x-ray diffraction, energy dispersive x-ray spectrum, selected area electron diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, and Raman and infrared spectra. The results show that the samples are SiC nanotubes composed with crystalline β-SiC structure and some residual carbon nanoscale grains. The SiC nanotubes with small inner pores have an outer diameter of less than 10nm and length of micrometers. The structures of SiC nanotubes are hollow inner pores, multiwall crystalline SiC layers, and thin amorphous silicon oxide outer layers. The substitution reaction model is proposed to explain the formation of SiC nanotubes. C atoms diffuse into Si nanotubes and Si atoms in Si nanotubes are partially substituted for C atoms by substitution chemical reaction, resulting in the formation of S...
Journal of Applied Physics | 2007
L.W. Lin; Y. H. Tang; Xiao-Fei Li; L. Z. Pei; Yong Zhang; Chi Guo
Large-scale amorphous silicon oxide nanowires (SiONWs) have been synthesized from silicon monoxide powder under supercritically hydrothermal conditions. The chemical bonding of amorphous SiONWs were investigated with Fourier-transform infrared (FTIR) spectrometry and near-edge x-ray absorption fine structure (NEXAFS) spectrometry. Our results show that the SiONWs are tens of microns long with a diameter from tens to hundreds of nanometers. Selected area electron diffraction (SAED) shows that the samples are amorphous. Energy dispersive x-ray spectrometry (EDX) analysis reveals that the SiONWs consist of Si and O elements in an atomic ratio approximately equal to 1:1.5. The results of FTIR and NEXAFS indicate that some OH groups are located on the surface of the SiONWs in the form of Si–OH. The relation between the chemical bonding and the possible growth mechanism was also discussed. During the growth process, water is an important species, which can provide H+ and OH− under supercritically hydrothermal ...
Journal of Applied Physics | 2006
L. Z. Pei; Y. H. Tang; X. Q. Zhao; Yiqin Chen; Chi Guo
SiC nanotubes have been synthesized under hydrothermal conditions. Research results show that SiC nanotubes consist of hollow inner pore, crystalline SiC wall layers, and thin amorphous silica sheath. Besides most abundant normal nanotubes, bamboo-shaped SiC nanotubes and elliptically hollow SiC nanospheres were also observed. The different morphologies of the SiC nanotubes are closely relative to the diameter of the SiC nanotubes. The confinement effect of other SiC nanotubes may play an important effect retarding the growth of SiC nanotubes to form the hollow SiC nanospheres. Defect inducing growth is proposed to explain the formation of bamboo-shaped SiC nanotubes.SiC nanotubes have been synthesized under hydrothermal conditions. Research results show that SiC nanotubes consist of hollow inner pore, crystalline SiC wall layers, and thin amorphous silica sheath. Besides most abundant normal nanotubes, bamboo-shaped SiC nanotubes and elliptically hollow SiC nanospheres were also observed. The different morphologies of the SiC nanotubes are closely relative to the diameter of the SiC nanotubes. The confinement effect of other SiC nanotubes may play an important effect retarding the growth of SiC nanotubes to form the hollow SiC nanospheres. Defect inducing growth is proposed to explain the formation of bamboo-shaped SiC nanotubes.
Advanced Materials | 2005
Yangwen Chen; Y. H. Tang; L. Z. Pei; Chi Guo
Journal of Crystal Growth | 2006
L. Z. Pei; Y. H. Tang; Yangwen Chen; Chi Guo; W. Zhang; Y. Zhang
Journal of Materials Science | 2007
L. Z. Pei; Y. H. Tang; X. Q. Zhao; Yiqin Chen
Microporous and Mesoporous Materials | 2008
Xiao-Fei Li; Y. H. Tang; L.W. Lin; J.L. Li
Archive | 2005
Y. H. Tang; L. Z. Pei; Yangwen Chen; Chi Guo
Journal of Shanghai University (english Edition) | 2011
Chi Guo; Y. H. Tang; L. Z. Pei; Yong Zhagn
Journal of Materials Science: Materials in Electronics | 2009
Chi Guo; Y. H. Tang; Enlei Zhang; X. C. Li; Jishan Li