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Novel SiOx-coated carbon nanotubes
M.Ruhle,T.Seeger,Ph.Redlich,N.Grobertb,M.Terrones,D.R.M.Walton,H.W.Kroto 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.1
A room temperature colloidal method for coating carbon nanotubes with silicon oxide is described. Morphology, chemical composition and SiOx/C interfaces of the coatings were investigated using state-of-the-art transmission electron microscopy and high spatially resolved electron energy-loss spectroscopy. The amorphous SiOx coatings exhibit a thickness of up to 10 nm. In addition, coatings were also created by a high temperature route. However, they tend to be more unstable and spallate when compared to coatings deposited at room temperature.
Oscillatory Mass Transport in Vapor-Liquid-Solid Growth of Sapphire Nanowires
Oh, S. H.,Chisholm, M. F.,Kauffmann, Y.,Kaplan, W. D.,Luo, W.,Ruhle, M.,Scheu, C. American Association for the Advancement of Scienc 2010 Science Vol.330 No.6003
<P>In vapor-liquid-solid (VLS) growth, the liquid phase plays a pivotal role in mediating mass transport from the vapor source to the growth front of a nanowire. Such transport often takes place through the liquid phase. However, we observed by in situ transmission electron microscopy a different behavior for self-catalytic VLS growth of sapphire nanowires. The growth occurs in a layer-by-layer fashion and is accomplished by interfacial diffusion of oxygen through the ordered liquid aluminum atoms. Oscillatory growth and dissolution reactions at the top rim of the nanowires occur and supply the oxygen required to grow a new (0006) sapphire layer. A periodic modulation of the VLS triple-junction configuration accompanies these oscillatory reactions.</P>
Processing, characterisation and theory of carbon nanotubes containing SiOx- based nanocomposites
N.Grobert,T.Seeger,G.Seifertc,M.Ruhle 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.1
Nanotechnology has become a very popular field for endeavour, embracing biology, chemistry, materials science, engineering, and physics. The interdisciplinary nature of the subject has fostered strong links, opening up new avenues of basic and applied research. Carbon nanotubes (CNTs) have assumed an important role in this context, because of their fascinating chemical and physical properties; thus exhibiting considerable potential for e.g. reinforced composites, nanoelectromechanical systems, and numerous other applications. Here we describe a novel route to nanocomposites consisting of multi-walled carbon nanotubes (MWNTs) embedded in amorphous SiO2. State-of-the-art transmission electron microscopy (HRTEM), electron energy loss spectroscopy (HREELS) and thermal gravimetric analysis (TGA) were used to characterise the material. Based on our observations, we propose theoretical models accounting for stable SiOx/tube interfaces using density functional based tight binding (DFTB).