Selective synthesis combined with chemical separation of single-walled carbon nanotubes for chirality selection
Selective synthesis combined with chemical separation of single-walled carbon nanotubes for chirality selection
复制标题
DOI：
10.1021/ja077886s
复制
发表时间：
2007-12-26
影响因子：
15
通讯作者：
Dai, Hongjie
中科院分区：
文献类型：
--
作者：
Li, Xiaolin;Tu, Xiaomin;Dai, Hongjie
单壁碳纳米管（SWNTs）是未来纳米电子学的潜在材料。由于单壁碳纳米管的电子和光学性质强烈依赖于管径和手性，通过选择性生长或化学分离获得具有窄（n，m）手性分布的单壁碳纳米管一直是研究的活跃领域。在这里，我们证明了一种新的，cross-FeRu催化剂提供单壁碳纳米管生长窄直径和手性分布在甲烷CVD。在600 ℃下，根据UV-vis-NIR吸收和光致发光激发/发射（PLE）光谱表征，在FeRu催化剂上的甲烷CVD主要产生（6，5）SWNT。在850 ℃下，产生的主要半导体物质是（8，4）、（7，6）和（7，5）SWNT，其直径和手性分布比通过其他催化剂生长的材料窄得多。此外，我们表明，窄直径/手性生长结合离子交换色谱法（IEC）的化学分离，极大地促进实现单一（m，n）单壁碳纳米管样品，如通过获得高度富集（8，4）单壁碳纳米管与近消除金属单壁碳纳米管存在于生长的材料。
Single-walled carbon nanotubes (SWNTs) are potential materials for future nanoetectronics. Since the electronic and optical properties of SWNTs strongly depend on tube diameter and chirality, obtaining SWNTs with narrow (n,m) chirality distribution by selective growth or chemical separation has been an active area of research. Here, we demonstrate that a new, bimetallic FeRu catalyst affords SWNT growth with narrow diameter and chirality distribution in methane CVD. At 600 degrees C, methane CVD on FeRu catalyst produced predominantly (6,5) SWNTs according to UV-vis-NIR absorption and photoluminescence excitation/emission (PLE) spectroscopic characterization. At 850 degrees C, the dominant semiconducting species produced are (8,4), (7,6), and (7,5) SWNTs, with much narrower distributions in diameter and chirality than materials grown by other catalysts. Further, we show that narrow diameter/chirality growth combined with chemical separation by ion exchange chromatography (IEC) greatly facilitates achieving single (m,n) SWNT samples, as demonstrated by obtaining highly enriched (8,4) SWNTs with near elimination of metallic SWNTs existing in the as-grown material.