Shinshu University 4-17-1 Wakasato, Nagano, 380-8553, Japan.
ACS Nano. 2010 Feb 23;4(2):1060-6. doi: 10.1021/nn901871g.
We performed resonant Raman/fluorescence spectroscopic studies on double-walled carbon nanotubes (DWNTs) that were dispersed in an aqueous single stranded DNA solution. The luminescence signals from the inner tubes of DWNTs are intensified in the isolated state of each individual DWNT. The completely depressed radial breathing modes (RBMs) associated with the outer tubes (whether semiconducting or metallic) via the mechanical wrapping and the strong charge transfer between DNA and the outer tubes support our interpretation that the bright luminescence and sharp absorption spectra come from only the inner tubes, and not from isolated SWNTs. The circumferentially wrapped DNA on the outer tubes of individually isolated DWNTs in an aqueous solution gives rise to strong charge transfer to the semiconducting and metallic outer tubes as well as to generating physical strain in the outer tubes.
我们对分散在水溶液中单链 DNA 中的双壁碳纳米管（DWNTs）进行了共振拉曼/荧光光谱研究。在每个单独的 DWNT 的隔离状态下，DWNTs 内管的发光信号得到增强。通过机械包裹和 DNA 与外管之间的强电荷转移，与外管（无论是半导体还是金属）相关的完全被抑制的径向呼吸模式（RBMs）支持我们的解释，即明亮的发光和尖锐的吸收光谱仅来自内管，而不是来自孤立的单壁碳纳米管。在水溶液中，单独分离的 DWNTs 的外管上环绕的 DNA 会导致强烈的电荷转移到半导体和金属外管，并在外管中产生物理应变。
