TY - JOUR
T1 - Flame synthesis of Fe catalyzed single-walled carbon nanotubes and Ni catalyzed nanofibers
T2 - Growth mechanisms and consequences
AU - Vander Wal, Randall L.
AU - Hall, Lee J.
N1 - Funding Information:
This work was supported by a NASA Strategic Research Fund (SRF) and administered through NASA cooperative agreement NAC3-544 with The National Center for Microgravity Research on Fluids and Combustion (NCMR) at The NASA-Glenn Research Center. The authors thank David R. Hull for the HRTEM imaging and invaluable feedback on the results.
PY - 2001/11/30
Y1 - 2001/11/30
N2 - Flame synthesis of single-walled carbon nanotubes and nanofibers is demonstrated using a pyrolysis flame configuration. Fe reacts preferentially with CO/H2/He mixtures to produce single-walled nanotubes (SWNTs). In contrast, Ni reacts preferentially with C2H2/H2/He mixtures to yield nanofibers. Both catalyst metals exhibit a marked size dependent reactivity towards these reactant gas mixtures. The yarmulke mechanism and a carbon solvation/diffusion/precipitation account for the different catalyzed products; SWNTs and nanofibers, respectively. Consequences of the size dependent reactivities of Fe and Ni nanoparticles and the respective growth mechanisms for the SWNTs and nanofibers are discussed.
AB - Flame synthesis of single-walled carbon nanotubes and nanofibers is demonstrated using a pyrolysis flame configuration. Fe reacts preferentially with CO/H2/He mixtures to produce single-walled nanotubes (SWNTs). In contrast, Ni reacts preferentially with C2H2/H2/He mixtures to yield nanofibers. Both catalyst metals exhibit a marked size dependent reactivity towards these reactant gas mixtures. The yarmulke mechanism and a carbon solvation/diffusion/precipitation account for the different catalyzed products; SWNTs and nanofibers, respectively. Consequences of the size dependent reactivities of Fe and Ni nanoparticles and the respective growth mechanisms for the SWNTs and nanofibers are discussed.
UR - http://www.scopus.com/inward/record.url?scp=0000866153&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0000866153&partnerID=8YFLogxK
U2 - 10.1016/S0009-2614(01)01198-8
DO - 10.1016/S0009-2614(01)01198-8
M3 - Article
AN - SCOPUS:0000866153
SN - 0009-2614
VL - 349
SP - 178
EP - 184
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 3-4
ER -