Disorder in DNA-Linked Gold Nanoparticle Assemblies

Details Disorder in DNA-Linked Gold Nanoparticle Assemblies Disorder in DNA-Linked Gold Nanoparticle Assemblies

2005-07-02

arxiv.org/abs/physics/0507014v1

Physics

Biological Physics

4 pages, 4 figures, Phys.Rev.Lett. (2005), to appear

Scientific paper

10.1103/PhysRevLett.95.046101

We report experimental observations on the effect of disorder on the phase behavior of DNA-linked nanoparticle assemblies. Variation in DNA linker lengths results in different melting temperatures of the DNA-linked nanoparticle assemblies. We observed an unusual trend of a non-monotonic ``zigzag'' pattern in the melting temperature as a function of DNAlinker length. Linker DNA resulting in unequal DNA duplex lengths introduces disorder and lowers the melting temperature of the nanoparticle system. Comparison with free DNA thermodynamics shows that such an anomalous zigzag pattern does not exist for free DNA duplex melting, which suggests that the disorder introduced by unequal DNA duplex lengths results in this unusual collective behavior of DNA-linked nanoparticle assemblies.

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