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Selective synthesis of double helices of carbon nanotube bundles grown on treated metallic substrates
Author(s) -
CervantesSodi Felipe,
ÍñiguezRábago Agustín,
RosasMeléndez Samuel,
BallesterosVillarreal Mónica,
Vilatela Juan J.,
ReyesGutiérrez Lucio G.,
Palacios Eduardo,
Terrones Mauricio,
JiménezRodríguez José A.
Publication year - 2012
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201200116
Subject(s) - microstructure , materials science , carbon nanotube , chemical engineering , vapours , substrate (aquarium) , nanotechnology , metal , composite material , metallurgy , oceanography , neuroscience , geology , engineering , biology
Double‐helix microstructures consisting of two parallel strands of hundreds of multi‐walled carbon nanotubes (MWCNTs) have been synthesized by chemical vapour deposition of ferrocene/toluene vapours on metal substrates. Growth of coiled carbon nanostructures with site selectivity is achieved by varying the duration of thermochemical pretreatment to deposit a layer of SiO x on the metallic substrate. Production of multibranched structures of MWCNTs converging in SiO x microstructure is also reported.In the abstract figure, panel (a) shows a coloured micrograph of a typical double‐helix coiled microstructure of MWCNTs grown on SiO x covered steel substrate. Green and blue show each of the two individual strands of MWCNTs. Panel (b) is an amplification of a SiO x microparticle (white) on the tip of the double‐stranded coil (green and blue). The microparticle guides the collective growth of hundreds of MWCNTs to form the coiled structure.