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Featured researches published by Y. H. Tang.


Journal of Applied Physics | 2006

Preparation of silicon carbide nanotubes by hydrothermal method

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

Water-assisted synthesis of silicon oxide nanowires under supercritically hydrothermal conditions

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

Formation mechanism of silicon carbide nanotubes with special morphology

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

Self-Assembled Silicon Nanotubes Grown from Silicon Monoxide

Yangwen Chen; Y. H. Tang; L. Z. Pei; Chi Guo


Journal of Crystal Growth | 2006

Silicon nanowires grown from silicon monoxide under hydrothermal conditions

L. Z. Pei; Y. H. Tang; Yangwen Chen; Chi Guo; W. Zhang; Y. Zhang


Journal of Materials Science | 2007

Single crystalline silicon carbide nanorods synthesized by hydrothermal method

L. Z. Pei; Y. H. Tang; X. Q. Zhao; Yiqin Chen


Microporous and Mesoporous Materials | 2008

Blue light emission in mesoporous SiOx nano-structure

Xiao-Fei Li; Y. H. Tang; L.W. Lin; J.L. Li


Archive | 2005

Preparation of self-assembled silicon nanotubes by hydrothermal method

Y. H. Tang; L. Z. Pei; Yangwen Chen; Chi Guo


Journal of Shanghai University (english Edition) | 2011

Silicon carbide nanotubes with special morphology prepared by super critical hydrothermal method and photoluminescence character

Chi Guo; Y. H. Tang; L. Z. Pei; Yong Zhagn


Journal of Materials Science: Materials in Electronics | 2009

Aggregation of self-assembled Ni(OH) 2 nanosheets under hydrothermal conditions

Chi Guo; Y. H. Tang; Enlei Zhang; X. C. Li; Jishan Li

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Xiao-Fei Li

University of Electronic Science and Technology of China

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