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Investigations of NanoBud formation
Nasibulin, Albert G.,Anisimov, Anton S.,Pikhitsa, Peter V.,Jiang, Hua,Brown, David P.,Choi, Mansoo,Kauppinen, Esko I. Elsevier 2007 Chemical physics letters Vol.446 No.1
<P><B>Graphical abstract</B></P><P>Schematic presentation of a novel carbon nanomaterial, NanoBud, grown by continuous transportation of a carbon layer from a catalyst particle to a CNT.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>The formation of a novel hybrid material, NanoBuds, single-walled carbon nanotubes (CNTs) with covalently attached fullerenes was investigated in a ferrocene–carbon monoxide system. Fullerenes and CNTs were simultaneously formed by carbon monoxide disproportionation on the surface of iron particles in the presence of etching agents such as H<SUB>2</SUB>O and CO<SUB>2</SUB>. On the basis of parametric investigations and <I>in situ</I> sampling of the product from different locations in the reactor the mechanisms for NanoBud formation are discussed.</P>
A novel hybrid carbon material
Nasibulin, Albert G.,Pikhitsa, Peter V.,Jiang, Hua,Brown, David P.,Krasheninnikov, Arkady V.,Anisimov, Anton S.,Queipo, Paula,Moisala, Anna,Gonzalez, David,Lientschnig, Gü,nther,Hassanien, Abdou,S Springer Science and Business Media LLC 2007 Nature nanotechnology Vol.2 No.3
<P>Both fullerenes and single-walled carbon nanotubes (SWNTs) exhibit many advantageous properties. Despite the similarities between these two forms of carbon, there have been very few attempts to physically merge them. We have discovered a novel hybrid material that combines fullerenes and SWNTs into a single structure in which the fullerenes are covalently bonded to the outer surface of the SWNTs. These fullerene-functionalized SWNTs, which we have termed NanoBuds, were selectively synthesized in two different one-step continuous methods, during which fullerenes were formed on iron-catalyst particles together with SWNTs during CO disproportionation. The field-emission characteristics of NanoBuds suggest that they may possess advantageous properties compared with single-walled nanotubes or fullerenes alone, or in their non-bonded configurations.</P>
CVD synthesis and radial deformations of large diameter single-walled CNTs
Paula Queipo,Albert G. Nasibulin,Sergey D. Shandakov,David Gonzalez,Hua Jiang,Esko I. Kauppinen 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Single-walled carbon nanotubes (CNTs) were synthesized by a chemical vapor deposition (CVD) method on transmission electron microscopy (TEM) silica coated nickel grids using carbon monoxide as carbon source and iron nanoparticles as catalyst. The produced CNTs were as large as 11 nm in diameter. Investigations on the CNT deformations based on high-resolution TEM images showed that the deformation of CNTs due to their interaction with the substrate occurs at diameters larger than 2.7 nm. Small deformation of free standing tubes was found to occur at diameters above approximately 4.5 nm. Single-walled carbon nanotubes (CNTs) were synthesized by a chemical vapor deposition (CVD) method on transmission electron microscopy (TEM) silica coated nickel grids using carbon monoxide as carbon source and iron nanoparticles as catalyst. The produced CNTs were as large as 11 nm in diameter. Investigations on the CNT deformations based on high-resolution TEM images showed that the deformation of CNTs due to their interaction with the substrate occurs at diameters larger than 2.7 nm. Small deformation of free standing tubes was found to occur at diameters above approximately 4.5 nm.
Aerosol Synthesis and Growth Mechanism of Magnetic Iron Nanoparticles
Kim, D.,Vasilieva, E.S.,Nasibulin, A.G.,Lee, D.W.,Tolochko, Oleg V.,Kim, Byoung Kee Trans Tech Publications, Ltd. 2007 Materials science forum Vol.534 No.-
<P>Magnetic oxide-coated iron nanoparticles with the mean size ranging from 6 to 75 nm were synthesized by aerosol method using iron carbonyl as a precursor under the flowing inert gas atmosphere. Oxide shells were formed by passivation of as-prepared iron particles. The influence of experimental parameters on the nanoparticles’ microstructure, phase composition and growth behavior as well as magnetic properties were investigated and discussed in this study.</P>