DNA-assisted dispersion and separation of carbon nanotubes
| Autor: | Bruce A. Diner, E. D. Semke, Anand Jagota, Raymond E Richardson, Nancy G. Tassi, Steve R. Lustig, Ming Zheng, Robert S. Mclean |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Models
Molecular Materials science Selective chemistry of single-walled nanotubes DNA Single-Stranded Carbon nanotubes in medicine chemistry.chemical_element Nanotechnology Carbon nanotube Microscopy Atomic Force law.invention Sonication Condensed Matter::Materials Science law General Materials Science Quantitative Biology::Biomolecules Molecular Structure Mechanical Engineering General Chemistry Chromatography Ion Exchange Condensed Matter Physics Carbon Optical properties of carbon nanotubes Spectrometry Fluorescence Carbon nanobud Solubility chemistry Mechanics of Materials Nucleic Acid Conformation Thermodynamics Carbide-derived carbon Carbon nanotube supported catalyst Crystallization Biotechnology |
| Zdroj: | Nature Materials. 2:338-342 |
| ISSN: | 1476-4660 1476-1122 |
| DOI: | 10.1038/nmat877 |
| Popis: | Carbon nanotubes are man-made one-dimensional carbon crystals with different diameters and chiralities. Owing to their superb mechanical and electrical properties, many potential applications have been proposed for them. However, polydispersity and poor solubility in both aqueous and non-aqueous solution impose a considerable challenge for their separation and assembly, which is required for many applications. Here we report our finding of DNA-assisted dispersion and separation of carbon nanotubes. Bundled single-walled carbon nanotubes are effectively dispersed in water by their sonication in the presence of single-stranded DNA (ssDNA). Optical absorption and fluorescence spectroscopy and atomic force microscopy measurements provide evidence for individually dispersed carbon nanotubes. Molecular modelling suggests that ssDNA can bind to carbon nanotubes through pi-stacking, resulting in helical wrapping to the surface. The binding free energy of ssDNA to carbon nanotubes rivals that of two nanotubes for each other. We also demonstrate that DNA-coated carbon nanotubes can be separated into fractions with different electronic structures by ion-exchange chromatography. This finding links one of the central molecules in biology to a technologically very important nanomaterial, and opens the door to carbon-nanotube-based applications in biotechnology. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|