Dynamic metallization of spherical DNA via conformational transition into gold nanostructures with controlled sizes and shapes
| Autor: | Yeonho Choi, Kihun Kwon, Jae-Seung Lee, Won Lee |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Nanostructure Reducing agent education Metal Nanoparticles 02 engineering and technology 010402 general chemistry 01 natural sciences Ion Nanomaterials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry mental disorders technology industry and agriculture DNA Surface-enhanced Raman spectroscopy 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Nanostructures chemistry Chemical engineering Ionic strength Reagent Gold 0210 nano-technology |
| Zdroj: | Journal of colloid and interface science. 594 |
| ISSN: | 1095-7103 |
| Popis: | Despite the reversible condensation properties of DNA, DNA metallization during controlled conformational transitions has been rarely investigated. We perform dynamic metallization of spherically condensed DNA nanoparticles (DNA NPs) via a globule-to-coil transition. A positively charged new Au3+ reagent is prepared via ligand-exchange of conventional complex Au3+ ions, which was used to synthesize spherically condensed DNA NPs simply based on the fundamental electrostatic and coordinative interactions between DNA and Au3+ions. Interestingly, the size of the Au3+-condensed DNA NPs (Au3+-DNA NPs) and the type of reducing agents lead to the formation of different Au nanostructures with unprecedented morphologies (cracked NPs, bowl-shaped NPs, and small NPs), owing to the controlled conformational changes in the Au3+-DNA NPs during metallization. The condensed DNA NPs play significant roles for Au nanostructures as (1) the dynamic template for the synthesis, (2) the reservoir and supply of Au3+ for the growth, and (3) the surface stabilizer. The synthesized Au nanostructures are remarkably stable against high ionic strength and exhibit catalytic activities and excellent SERS properties. This is the first study on the morphological control and concomitant dynamic metallization of spherically condensed DNA, proposing new synthetic routes for bioinorganic nanomaterials. |
| Databáze: | OpenAIRE |
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