Theory of Melting and the Optical Properties of Gold/DNA Nanocomposites
arXiv:cond-mat/0305230 · doi:10.1103/PhysRevB.67.212202
Abstract
We describe a simple model for the melting and optical properties of a DNA/gold nanoparticle aggregate. The optical properties at fixed wavelength change dramatically at the melting transition, which is found to be higher and narrower in temperature for larger particles, and much sharper than that of an isolated DNA link. All these features are in agreement with available experiments. The aggregate is modeled as a cluster of gold nanoparticles on a periodic lattice connected by DNA bonds, and the extinction coefficient is computed using the discrete dipole approximation. Melting takes place as an increasing number of these bonds break with increasing temperature. The melting temperature corresponds approximately to the bond percolation threshold.
5 pages, 4 figure. To be published in Phys. Rev. B
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- Melting Transition of Directly-Linked Gold Nanoparticle DNA Assembly
- Structure Formation, Melting, and the Optical Properties of Gold/DNA Nanocomposites: Effects of Relaxation Time
- The Reversible Phase Transition of DNA-Linked Colloidal Gold Assemblies
- Shear Unzipping of DNA
- Self-assembly of DNA-functionalized colloids
- Theory of the Optical Properties of a DNA-Modified Gold Nanoparticle System