Optical absorption of DNA-carbon nanotube structures
Optical absorption of DNA-carbon nanotube structures
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DOI：
10.1021/nl062906u
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发表时间：
2007-05-01
期刊：
影响因子：
10.8
通讯作者：
Golovchenko, Jene A.
中科院分区：
文献类型：
--
作者：
Hughes, Mary E.;Brandin, Eric;Golovchenko, Jene A.
我们测量了单壁碳纳米管(DNA/SWNT)结合的单链DNA的紫外光吸收。DNA/SWNT的核苷酸吸光度首次实验证实了DNA通过pi堆积与纳米管结合。由于pi堆叠结构的典型减色吸收主要发生在沿着光学各向异性单壁碳纳米管的轴线上的DNA偶极跃迁，因此DNA与纳米管结合后的吸光度变化揭示了四个结合核苷酸中的每一个相对于纳米管的长轴的择优取向。
We measured the UV optical absorption of single-stranded DNA bound to single-walled carbon nanotubes (DNA/SWNT). The nucleotide absorbance from DNA/SWNT provides the first experimental confirmation that DNA binds to nanotubes through pi-stacking. Because the hypochromic absorbance typical of pi-stacked structures are expected to occur primarily for DNA dipole transitions that lie along the axis of the optically anisotropic SWNTs, the absorbance changes following binding of DNA to nanotubes reveal the preferred orientation assumed by each of the four bound nucleotides with respect to the nanotube's long axis.