Abstract
Self-assembly of synthetic oligonucleotides into two-dimensional lattices presents a ‘bottom-up’ approach to the fabrication of devices on nanometer scale. We report the design and observation of two-dimensional crystalline forms of DNAs that are composed of twenty-one plane oligonucleotides and one phosphate-modified oligonucleotide. These synthetic sequences are designed to self-assemble into four double-crossover (DX) DNA tiles. The ‘sticky ends’ of these tiles that associate according to Watson-Crick’s base pairing are programmed to build up specific periodic patterns upto tens of microns. The patterned crystals are visualized by the transmission electron microscopy.
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