Colloidal nanocrystals consisting of metals or semiconductors are of interest especially in nanotechnology, because of their distinctive properties not found in the bulk state. Gold nanoparticles (AuNPs) exhibit unique optical and electrical properties such as surface plasmon resonance. The precise arrangement of AuNPs in one- to three-dimensional arrays is one of the important technical challenges in bottom-up nanotechnology, because new properties not observed in the distributed state are expected to emerge the organized states. In this presentation, we propose a method to prepare one- and two-dimensional AuNP arrays with defined distances and geometries. We prepared divalent DNA/AuNP conjugates attaching two DNA strands at diametrically opposed positions using polar singularities produced on self-assembled monolayer (SAM)-coated AuNPs. Highly linear one-dimensional and tetragonal lattice-like two-dimensional AuNP arrays with defined distances could be constructed by using the divalent DNA/AuNP conjugates. The obtained AuNP arrays can be applied as nanomaterials exhibiting novel properties.

Formation of 1D and 2D gold nanoparticle arrays using divalent DNA/AuNP conjugates

244th National Meeting (2012)

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