TY - JOUR
T1 - High temperature growth of single-walled carbon nanotubes with a narrow chirality distribution by tip-growth mode
AU - He, Maoshuai
AU - Yang, Tao
AU - Shang, Danhong
AU - Xin, Benwu
AU - Chernov, Alexander I.
AU - Obraztsova, Elena D.
AU - Sainio, Jani
AU - Wei, Na
AU - Cui, Hongzhi
AU - Jiang, Hua
AU - Kauppinen, Esko
PY - 2018/6/1
Y1 - 2018/6/1
N2 - An MgO supported Co catalyst prepared by atomic layer deposition was applied for the growth of single-walled carbon nanotubes (SWNTs). Different from other catalysts, which generally nucleate SWNTs by base-growth mode, the Co-MgO catalyst uniquely generates SWNTs by tip-growth mode, indicating a weak metal-support interaction. During chemical vapor deposition process, the lift-off of Co nanoparticles from support inhibits the aggregation of Co nanoparticles and favors the synthesis of small-diameter SWNTs with a narrow chirality distribution, even at a high reaction temperature. Particularly, product grown at 800 °C maintains a preferential synthesis of small-diameter (6, 5) SWNTs. The enrichment of (6, 5) SWNT arises from the combination of SWNT-catalyst interface thermodynamics with growth kinetic. The growth dynamics of SWNTs was further investigated by in situ Raman spectroscopy, which revealed that SWNTs with smaller diameters appeared prior to the growth of large-diameter counterparts.
AB - An MgO supported Co catalyst prepared by atomic layer deposition was applied for the growth of single-walled carbon nanotubes (SWNTs). Different from other catalysts, which generally nucleate SWNTs by base-growth mode, the Co-MgO catalyst uniquely generates SWNTs by tip-growth mode, indicating a weak metal-support interaction. During chemical vapor deposition process, the lift-off of Co nanoparticles from support inhibits the aggregation of Co nanoparticles and favors the synthesis of small-diameter SWNTs with a narrow chirality distribution, even at a high reaction temperature. Particularly, product grown at 800 °C maintains a preferential synthesis of small-diameter (6, 5) SWNTs. The enrichment of (6, 5) SWNT arises from the combination of SWNT-catalyst interface thermodynamics with growth kinetic. The growth dynamics of SWNTs was further investigated by in situ Raman spectroscopy, which revealed that SWNTs with smaller diameters appeared prior to the growth of large-diameter counterparts.
KW - Chirality-selective
KW - Metal-support interaction
KW - Raman spectroscopy
KW - Single-walled carbon nanotube
KW - Temperature-programmed reduction
KW - Tip growth
UR - http://www.scopus.com/inward/record.url?scp=85044768766&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2018.02.051
DO - 10.1016/j.cej.2018.02.051
M3 - Article
AN - SCOPUS:85044768766
VL - 341
SP - 344
EP - 350
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -