Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 2, Pages 197-199Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja107855q
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Funding
- Queensland Government
- UQ
- UQ ECR
- MOST of China [2011CB932601, 2008DFA51400]
- NSFC [50921004, 50702063, 50672103]
- CAS [KJCX2-YW-M01]
- Supercomputing Center, CNIC, CAS
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To understand in-depth the nature of the catalyst and the growth mechanism of single-walled carbon nanotubes (SWCNTs) on a newly developed silica catalyst, we performed this combined experimental and theoretical study. In situ transmission electron microscopy (TEM) observations revealed that the active catalyst for the SWCNT growth is solid and amorphous SiOx nanoparticles (NPs), suggesting a vapor-solid-solid growth mechanism. From in situ TEM and chemical vapor deposition growth experiments, we found that oxygen plays a crucial role in SWCNT growth in addition to the well-known catalyst size effect. Density functional theory calculations showed that oxygen atoms can enhance the capture of-CHx and consequently facilitate the growth of SWCNTs on oxygen-containing SiOx NPs.
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