Structure-based carbon nanotube sorting by sequence-dependent DNA assembly
Structure-based carbon nanotube sorting by sequence-dependent DNA assembly
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DOI：
10.1126/science.1091911
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发表时间：
2003-11-28
期刊：
影响因子：
56.9
通讯作者：
Walls, DJ
中科院分区：
文献类型：
--
作者：
Zheng, M;Jagota, A;Walls, DJ
单链DNA（ssDNA）对碳纳米管（CNTs）的包裹具有序列依赖性。对ssDNA文库的系统搜索选择了序列d（GT）n，n = 10至45，其以DNA-CNT混合物的静电取决于管直径和电子性质的方式自组装成围绕单个纳米管的螺旋结构，使得能够通过阴离子交换色谱法分离纳米管。光学吸收和拉曼光谱表明，早期馏分富集在较小的直径和金属管，而后期馏分富集在较大的直径和半导体管。
Wrapping of carbon nanotubes (CNTs) by single-stranded DNA (ssDNA) was found to be sequence-dependent. A systematic search of the ssDNA library selected a sequence d(GT) n, n = 10 to 45 that self-assembles into a helical structure around individual nanotubes in such a way that the electrostatics of the DNA-CNT hybrid depends on tube diameter and electronic properties, enabling nanotube separation by anion exchange chromatography. Optical absorption and Raman spectroscopy show that early fractions are enriched in the smaller diameter and metallic tubes, whereas late fractions are enriched in the larger diameter and semiconducting tubes.