Loosening the DNA wrapping around single-walled carbon nanotubes by increasing the strand length

In this study, we discuss the influence of DNA strand length on DNA wrapping of single-walled carbon nanotubes under high-shear sonication and find that different strand length results in changed DNA-nanotube interaction, which is sensitively probed by the upshift extent of the Raman radial breathin...

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Bibliographic Details
Published in:Nanotechnology 2009-05, Vol.20 (19), p.195603-195603
Main Authors: Yang, Quan-Hong, Wang, Qi, Gale, Nittaya, Oton, Claudio J, Cui, Lan, Nandhakumar, Iris S, Zhu, Zhenping, Tang, Zhiyuan, Brown, Tom, Loh, Wei H
Format: Article
Language:English
Subjects:
Computer Simulation
Crystallization - methods
DNA - chemistry
DNA - ultrastructure
Macromolecular Substances - chemistry
Materials Testing
Models, Chemical
Models, Molecular
Molecular Conformation
Nanotechnology - methods
Nanotubes, Carbon - chemistry
Nanotubes, Carbon - ultrastructure
Particle Size
Surface Properties
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Summary:In this study, we discuss the influence of DNA strand length on DNA wrapping of single-walled carbon nanotubes under high-shear sonication and find that different strand length results in changed DNA-nanotube interaction, which is sensitively probed by the upshift extent of the Raman radial breathing mode bands of nanotubes due to DNA wrapping. The difference in the interaction between nanotubes and DNA strands of various length results in apparently different degrees of wrapping compactness, revealed by atomic force microscopy observations, and nanotube selectivity in wrapping, indicated by both Raman and photoluminescence spectroscopy results. The above findings can be utilized to precisely control the nanotube diameter distribution and modulate the physicochemical properties of the nanotube wrapped by DNA without any direct functionalization of nanotubes. This finding is of considerable interest from both theoretical and practical standpoints.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/20/19/195603