2003/05/10 by Sung Yong Park, D. Stroud · 2 citations
Biochemistry, Genetics and Molecular Biology · Materials Science · Physics and Astronomy · #Advanced biosensing and bioanalysis techniques #DNA and Nucleic Acid Chemistry #Gold and Silver Nanoparticles Synthesis and Applications #cond-mat #q-bio
paper · pdf · doi:10.1103/physrevb.67.212202
5 pages, 4 figure. To be published in Phys. Rev. B
arxiv created 2003/05/10 · openalex publication_date 2003/06/11 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.