Synthesis of single-walled carbon nanotubes (SWNTs) with well-defined atomic arrangements has been widely recognized in the past few decades as the biggest challenge in the SWNT community, and has become a bottleneck for the application of SWNTs in nano-electronics. Here, we report a selective synthesis of (12, 6) SWNTs with an enrichment of 50%-70% by chemical vapor deposition (CVD) using sputtered Co-W as a catalyst. This is achieved under much milder reduction and growth conditions than those in the previous report using transition-metal molecule clusters as catalyst precursors (Nature, 2014, 510, 522). Meanwhile, in-plane transmission electron microscopy unambiguously identified an intermediate structure of Co6W6C, which is strongly associated with selective growth. However, most of the W atoms disappear after a 5 min CVD growth, which implies that anchoring W may be important in this puzzling Co-W system.

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ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

A Novel Optically Active Bisphosphine Ligand CDP, Derived from an anti Head-to-Head Coumarin Dimer: Synthesis and Application to the Rhodium-Catalyzed Asymmetric Hydrogenation of Arylenamides.-CDP, prepared from the title coumarin dimer in 4 steps using conventional procedures, has potent asymmetric induction ability when applied to the hydrogenation of arylenamides (I) and (III). -(HAYASHI, M.; HASHIMOTO, Y.; TAKEZAKI, H.; WATANABE, Y.; SAIGO, K.; Tetrahedron: Asymmetry 9