DNA-碳纳米管结构的光吸收
Optical absorption of DNA-carbon nanotube structures.
作者信息
Hughes Mary E, Brandin Eric, Golovchenko Jene A
机构信息
School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
出版信息
Nano Lett. 2007 May;7(5):1191-4. doi: 10.1021/nl062906u. Epub 2007 Apr 10.
Abstract
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.
摘要
我们测量了与单壁碳纳米管结合的单链DNA（DNA/单壁碳纳米管）的紫外光吸收。DNA/单壁碳纳米管中核苷酸的吸光度首次通过实验证实了DNA通过π堆积与纳米管结合。由于π堆积结构典型的减色吸光度预计主要发生在沿光学各向异性单壁碳纳米管轴的DNA偶极跃迁中，DNA与纳米管结合后吸光度的变化揭示了四种结合核苷酸相对于纳米管长轴的优先取向。
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