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首页> 外文期刊>Chemistry: A European journal >Regulation of the near-IR spectral properties of individually dissolved single-walled carbon nanotubes in aqueous solutions of dsDNA
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Regulation of the near-IR spectral properties of individually dissolved single-walled carbon nanotubes in aqueous solutions of dsDNA

机译：dsDNA水溶液中单独溶解的单壁碳纳米管的近红外光谱特性的调节

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Two different single-walled carbon nanotubes (SWNTs), the so-called HiPco and CoMoCAT, have been individually dissolved in aqueous solutions of double-stranded DNA (dsDNA). Atomic force microscopy (AFM) revealed the fine structures of the dsDNA-wrapped SWNTs. The near-IR absorption and photoluminescence (PL) spectra of aqueous solutions of dsDNA-wrapped SWNTs were recorded and, in pure water, we observed only a single two-dimensional PL spot from (6,5) SWNTs for both HiPco and CoMoCAT. In sharp contrast, when Tris-EDTA (TE) buffer was used in place of pure water, the PL-mapping images of the solutions showed chirality indices of (6,5), (7,5), (7,6), (8,4), (9,4), and (10,2) for HiPco-SWNTs, and (6,5) and (7,5) for CoMo-CAT-SWNTs. The first semiconducting bands in the near-IR absorption spectra of solutions of dsDNA-wrapped SWNTs are different. To explain the observed differences in the near-IR absorption and PL behavior we conducted several experiments and found that the near-IR optical properties of the SWNTs can be modulated by changing the pH of the solutions. The pH breakpoints for near-IR absorption bleaching and PL quenching are different and the phenomena are explained by differences in the numbers of holes generated on the SWNTs. These findings are important from both fundamental and applied viewpoints.
机译：两种不同的单壁碳纳米管（SWNT），即所谓的HiPco和CoMoCAT，已分别溶解在双链DNA（dsDNA）的水溶液中。原子力显微镜（AFM）揭示了dsDNA包裹的单壁碳纳米管的精细结构。记录了dsDNA包裹的单壁碳纳米管水溶液的近红外吸收和光致发光（PL）光谱，在纯水中，对于HiPco和CoMoCAT，我们仅从（6,5）单壁碳纳米管中观察到单个二维PL光斑。与之形成鲜明对比的是，当使用Tris-EDTA（TE）缓冲液代替纯水时，溶液的PL映射图像显示手性指数分别为（6,5），（7,5），（7,6），对于HiPco-SWNT，分别为（8,4），（9,4）和（10,2），对于CoMo-CAT-SWNT为（6,5）和（7,5）。 dsDNA包裹的单壁碳纳米管溶液的近红外吸收光谱中的第一个半导体带是不同的。为了解释观察到的近红外吸收和PL行为的差异，我们进行了几次实验，发现可以通过改变溶液的pH值来调节SWNT的近红外光学性质。用于近红外吸收漂白和PL猝灭的pH断裂点是不同的，这种现象是通过在SWNT上产生的孔数不同来解释的。从基础和应用的观点来看，这些发现都是重要的。

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