Chirality specific and spatially uniform synthesis of single-walled carbon nanotubes from a sputtered Co-W bimetallic catalyst
Chirality specific and spatially uniform synthesis of single-walled carbon nanotubes from a sputtered Co-W bimetallic catalyst
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DOI：
10.1039/c6nr02749k
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发表时间：
2016-01-01
期刊：
影响因子：
6.7
通讯作者：
Maruyama, Shigeo
中科院分区：
文献类型：
--
作者：
An, Hua;Kumamoto, Akihito;Maruyama, Shigeo
在过去的几十年里，具有明确原子排列的单壁碳纳米管（SWNTs）的合成被广泛认为是单壁碳纳米管领域的最大挑战，并已成为单壁碳纳米管在纳米电子学中应用的瓶颈。在这里，我们报告了选择性合成（12，6）单壁碳纳米管的富集50%-70%的化学气相沉积（CVD）使用溅射Co-W作为催化剂。这是在比使用过渡金属分子簇作为催化剂前体的先前报道中的那些更温和的还原和生长条件下实现的（Nature，2014，510，522）。与此同时，在平面透射电子显微镜明确地确定了Co 6 W 6C，这是强烈相关的选择性生长的中间结构。然而，大部分的W原子消失后，5分钟的CVD生长，这意味着锚定W可能是重要的，在这个令人费解的Co-W系统。
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.