Graduate School of Environmental Studies, Nagoya University, B4-1(780), Chikusa-ku, Nagoya 464-8601, Japan.
Nanotechnology. 2011 Sep 16;22(37):375604. doi: 10.1088/0957-4484/22/37/375604. Epub 2011 Aug 19.
We describe the conformational behavior and morphological control of DNA-mineralized CdS nanowires in a bulk solution. The conformational behavior of individual double-stranded DNA in the presence of cadmium ions and stoichiometric mixtures of cadmium ions and sulfide ions was directly visualized by fluorescence microscopy. It was found that in the presence of mixtures of cadmium ions and sulfide ions, DNA molecules exhibit a conformational transition from an elongated coil to a compacted state. Mineralized DNA nanowires possess a significant conformational freedom at a microscale, and flexibility in the micro- and nanodimensions. The density of the inorganic material on the nanowire can be controlled by varying the concentrations and the molar ratio of Na(2)S to Cd(ClO(4))(2).
我们描述了在本体溶液中 DNA 矿化 CdS 纳米线的构象行为和形态控制。通过荧光显微镜直接观察到了单个双链 DNA 在存在镉离子和镉离子与硫化物离子的化学计量混合物时的构象行为。结果发现，在存在镉离子和硫化物离子混合物的情况下，DNA 分子从伸长的线圈转变为紧密的状态。矿化 DNA 纳米线在微尺度上具有显著的构象自由度，并且在微观和纳米尺度上具有灵活性。通过改变 Na(2)S 与 Cd(ClO(4))(2)的浓度和摩尔比，可以控制纳米线上无机材料的密度。
