Enrichment of single-walled carbon nanotubes by diameter in density gradients
Enrichment of single-walled carbon nanotubes by diameter in density gradients
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DOI：
10.1021/nl050133o
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发表时间：
2005-04-01
期刊：
影响因子：
10.8
通讯作者：
Hersam, MC
中科院分区：
文献类型：
--
作者：
Arnold, MS;Stupp, SI;Hersam, MC
通过DNA包裹的单壁碳纳米管在水中密度梯度的超速离心，实现了单壁碳纳米管的整体浓缩和直径分离。在密度为1.11-1.17g cm(-3)的范围内，通过可见的单壁碳纳米管的彩色条带的形成来识别这种分离。分离后的单壁碳纳米管的光吸收光谱表明，直径逐渐减小的单壁碳纳米管的浮力越来越大。这种非破坏性和可扩展的分离策略有望影响分子电子学、光电子学和传感领域，在这些领域，单分散带隙的单壁碳纳米管是必不可少的。
The bulk enrichment and separation of single-walled carbon nanotubes (SWNTs) by diameter has been achieved through ultracentrifugation of DNA-wrapped SWNTs in aqueous density gradients. The separation is identified by the visual formation of colored bands of SWNTs in the density range of 1.11-1.17 g cm(-3). The optical absorbance spectra of the separated SWNTs indicate that SWNTs of decreasing diameter are increasingly more buoyant. This nondestructive and scalable separation strategy is expected to impact the fields of molecular electronics, optoelectronics, and sensing where SWNTs of a monodisperse band gap are essential.