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发信人: boyang (Protoss), 信区: Material
标 题: Nature news:Nanoscale physics: Pure boron tubes
发信站: 哈工大紫丁香 (Tue Apr 20 10:14:40 2004), 站内信件
Nanoscale physics: Pure boron tubes
J. Phys. Chem. B 108, 3967–3969 (2004)
Researchers have already made pure boron nanowires, and theoretical studies in
dicate that hollow boron nanotubes should be stable; they might even be better
conductors of electricity than carbon nanotubes.
Dragos Ciuparu et al. now claim to have made the first pure boron nanotubes, b
y reacting boron trichloride with hydrogen gas at 870°C. The tubes are single
-walled and measure about 3 nanometres in diameter. The reaction relies on a m
agnesium catalyst loaded onto mesoporous silica. The pores in the silica act a
s a template for the nanotubes, which grow up to 20 nm out of the catalyst sur
face.
The authors report that exposure to an electron beam damages the nanotubes, so
electron-microscope images of them, taken at low dose, are rather fuzzy. Howe
ver, the Raman infrared spectrum of the sample is consistent with a tubular st
ructure. A more detailed structural analysis, omitting the electron beam, will
follow.
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