scholarly journals Generation and agglomeration behaviour of size-selected sub-nm iron clusters as catalysts for the growth of carbon nanotubes

2011 ◽  
Vol 2 ◽  
pp. 734-739 ◽  
Author(s):  
Ravi Joshi ◽  
Benjamin Waldschmidt ◽  
Jörg Engstler ◽  
Rolf Schäfer ◽  
Jörg J Schneider
Keyword(s):  
Carbon Nanotubes ◽  
Iron Nanoparticles ◽  
Surface Coverage ◽  
Size Range ◽  
Iron Clusters ◽  
Median Size ◽  
Initial Cluster ◽  
Ligand Free ◽  
Cvd Growth ◽  
Insight Into

Mass-selected, ligand-free Fe N clusters with N = 10–30 atoms (cluster diameter: 0.6–0.9 nm) were implanted into [Al@SiO x ] surfaces at a low surface coverage corresponding to a few thousandths up to a few hundredths of a monolayer in order to avoid initial cluster agglomeration. These studies are aimed towards gaining an insight into the lower limit of the size regime of carbon nanotube (CNT) growth by employing size-selected sub-nm iron clusters as catalyst or precatalyst precursors for CNT growth. Agglomeration of sub-nm iron clusters to iron nanoparticles with a median size range between three and six nanometres and the CNT formation hence can be observed at CVD growth temperatures of 750 °C. Below 600 °C, no CNT growth is observed.

Initial growth of single-walled carbon nanotubes on supported iron clusters: a molecular dynamics study

2007 ◽  
Vol 43 (1-3) ◽  
pp. 185-189 ◽  
Author(s):  
H. Duan ◽  
F. Ding ◽  
A. Rosén ◽  
A. Harutyunyan ◽  
T. Tokune ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Single Walled Carbon Nanotubes ◽  
Initial Growth ◽  
Iron Clusters ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Supported Iron

Insight into the effect of surface coverage and structure over different Co surfaces on the behaviors of H2 adsorption and activation

2016 ◽  
Vol 41 (48) ◽  
pp. 23022-23032 ◽  
Author(s):  
Qiang Wang ◽  
Riguang Zhang ◽  
Litao Jia ◽  
Bo Hou ◽  
Debao Li ◽  
...  
Keyword(s):  
Surface Coverage ◽  
H2 Adsorption ◽  
Insight Into ◽  
Effect Of Surface

Carbon diffusion in CVD growth of carbon nanotubes on metal nanoparticles

2008 ◽  
Vol 245 (10) ◽  
pp. 2185-2188 ◽  
Author(s):  
Oleg V. Yazyev ◽  
Alfredo Pasquarello
Keyword(s):  
Carbon Nanotubes ◽  
Metal Nanoparticles ◽  
Carbon Diffusion ◽  
Cvd Growth

Formation Of Single-Wall Carbon Nanotubes Forrest Assemblies On Metal Surfaces

2002 ◽  
Vol 734 ◽  
Author(s):  
Debjit Chattopadhyay ◽  
Izabela Galeska ◽  
Fotios Papadimitrakopoulos
Keyword(s):  
Carbon Nanotubes ◽  
Surface Coverage ◽  
Iron Hydroxide ◽  
Growth Characteristics ◽  
Self Organization ◽  
Single Wall Carbon Nanotubes ◽  
Unique Challenge ◽  
Single Wall Carbon ◽  
Topological Characteristics

ABSTRACTLearning how to purify and manipulate single wall carbon nanotubes (SWNTs) presents a unique challenge in material science. The processing-related difficulties of these long nano-fibers stem from their high aspect ratio, rigidity and the profound hydrophobic attractions along their tubular walls. Shortening them into discrete segments, with lengths from tens to hundreds of nanometers, presents a viable methodology to alleviate the shape-induced intractability. In addition, the metal-assisted self-organization of these nanosized objects into nano-forest geometries with dense perpendicular surface grafting, demonstrates that such nanosized objects hold significant promise for the development of nanoscale devices. This paper will present an extensive characterization of the topological characteristics of these assemblies, along with their surface coverage, growth characteristics and height fluctuation on iron hydroxide substrates.

In Situ Observation of Nucleation and Growth of Carbon Nanotubes from Iron Carbide Nanoparticles

2008 ◽  
Vol 1142 ◽  
Author(s):  
Hideto Yoshida ◽  
Seiji Takeda ◽  
Tetsuya Uchiyama ◽  
Hideo Kohno ◽  
Yoshikazu Homma
Keyword(s):  
Carbon Nanotubes ◽  
Iron Carbide ◽  
Bulk Diffusion ◽  
Chemical Vapor ◽  
Nucleation And Growth ◽  
Atomic Scale ◽  
In Situ Observation ◽  
Transmission Electron ◽  
Cvd Growth

ABSTRACTNucleation and growth processes of carbon nanotubes (CNTs) in iron catalyzed chemical vapor deposition (CVD) have been observed by means of in-situ environmental transmission electron microscopy. Our atomic scale observations demonstrate that solid state iron carbide (Fe3C) nanoparticles act as catalyst for the CVD growth of CNTs. Iron carbide nanoparticles are structurally fluctuated in CVD condition. Growth of CNTs can be simply explained by bulk diffusion of carbon atoms since nanoparticles are carbide.

Analysis of SiC CVD Growth in a Horizontal Hot-Wall Reactor by Experiment and 3D Modelling

2007 ◽  
Vol 556-557 ◽  
pp. 61-64
Author(s):  
Y. Shishkin ◽  
Rachael L. Myers-Ward ◽  
Stephen E. Saddow ◽  
Alexander Galyukov ◽  
A.N. Vorob'ev ◽  
...  
Keyword(s):  
Growth Rate ◽  
Growth Process ◽  
Three Dimensional ◽  
Chemical Species ◽  
3D Modelling ◽  
Complete Model ◽  
Cvd Growth ◽  
Dimensional Simulation ◽  
Insight Into ◽  
Hot Zone

A fully-comprehensive three-dimensional simulation of a CVD epitaxial growth process has been undertaken and is reported here. Based on a previously developed simulation platform, which connects fluid dynamics and thermal temperature profiling with chemical species kinetics, a complete model of the reaction process in a low pressure hot-wall CVD reactor has been developed. Close agreement between the growth rate observed experimentally and simulated theoretically has been achieved. Such an approach should provide the researcher with sufficient insight into the expected growth rate in the reactor as well as any variations in growth across the hot zone.

Catalytic CVD-growth of array of multiwall carbon nanotubes on initially amorphous film Co–Zr–N–O

2016 ◽  
Vol 64 ◽  
pp. 97-102 ◽  
Author(s):  
Dmitry G. Gromov ◽  
Sergey Bulyarskii ◽  
Alexander Pavlov ◽  
Sergey Scorik ◽  
Alexey Shulyat'ev ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Amorphous Film ◽  
Cvd Growth ◽  
Multiwall Carbon ◽  
Catalytic Cvd
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