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Top: Optical absorption spectra during DNA-linked gold nanoparticle aggregation. Adding linker DNA to the system results in a shift and broadening of the gold surface plasmon peak at 520 nm. Reprint from Kiang [41]. Bottom: Calculated extinction spectra for DNA-linked metal nanosphere assemblies of increasing size. The match between theory and experiments helps us to understand the particle aggregation process. Reprint from Lazarides and Schatz [46].
