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Chirality-specific growth of single-walled carbon nanotubes on solid alloy catalysts
Yang, F; Wang, X; Zhang, DQ; Yang, J; Luo, D; Xu, ZW; Wei, JK; Wang, JQ; Xu, Z; Peng, F; Li, XM; Li, RM; Li, YL; Li, MH; Bai, XD; Ding, F; Li, Y; yanli@pku.edu.cn
2014
Source PublicationNATURE
ISSN0028-0836
Volume510Issue:7506Pages:522
AbstractCarbon nanotubes have many material properties that make them attractive for applications(1,2). In the context of nanoelectronics(3), interest has focused on single-walled carbon nanotubes(4) (SWNTs) because slight changes in tube diameter and wrapping angle, defined by the chirality indices (n,m), will shift their electrical conductivity from one characteristic of a metallic state to one characteristic of a semiconducting state, and will also change the bandgap. However, this structure-function relationship can be fully exploited only with structurally pure SWNTs. Solution-based separation methods(5) yield tubes within a narrow structure range, but the ultimate goal of producing just one type of SWNT by controlling its structure during growth has proved to be a considerable challenge over the last two decades(6-9). Such efforts aim to optimize the composition(6,10-17) or shape(18-21) of the catalyst particles that are used in the chemical vapour deposition synthesis process to decompose the carbon feedstock and influence SWNT nucleation and growth(22-25). This approach resulted in the highest reported proportion, 55 per cent, of single-chirality SWNTs in an as-grown sample(11). Here we show that SWNTs of a single chirality, (12, 6), can be produced directly with an abundance higher than 92 per cent when using tungsten-based bimetallic alloy nanocrystals as catalysts. These, unlike other catalysts used so far, have such high melting points that they maintain their crystalline structure during the chemical vapour deposition process. This feature seems crucial because experiment and simulation both suggest that the highly selective growth of (12, 6) SWNTs is the result of a good structural match between the carbon atom arrangement around the nanotube circumference and the arrangement of the catalytically active atoms in one of the planes of the nanocrystal catalyst. We anticipate that using high-melting-point alloy nanocrystals with optimized structures as catalysts paves the way for total chirality control in SWNT growth and will thus promote the development of SWNT applications.
KeywordMolecular Nanoclusters Selective Growth Nanoparticles Diameter Dynamics Angle
Indexed BySCI
Language英语
WOS IDWOS:000337806300043
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/14040
Collection中科院上海应用物理研究所2011-2019年
Corresponding Authoryanli@pku.edu.cn
Recommended Citation
GB/T 7714
Yang, F,Wang, X,Zhang, DQ,et al. Chirality-specific growth of single-walled carbon nanotubes on solid alloy catalysts[J]. NATURE,2014,510(7506):522.
APA Yang, F.,Wang, X.,Zhang, DQ.,Yang, J.,Luo, D.,...&yanli@pku.edu.cn.(2014).Chirality-specific growth of single-walled carbon nanotubes on solid alloy catalysts.NATURE,510(7506),522.
MLA Yang, F,et al."Chirality-specific growth of single-walled carbon nanotubes on solid alloy catalysts".NATURE 510.7506(2014):522.
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