Photochemical metallization to fabricate DNA-templated gold nanorings

• DNA template.
• Photochemical metallization.
• Gold nanoring.
• DNA compaction.

Well-dispersed uniform gold nanorings of 100 nm size were fabricated by slow photochemical reduction of aqueous gold(III) on compacted DNA of toroidal morphology, along with deposition of a thin gold layer on DNA condensates. The outer and inner diameters of nanorings were 105±17 nm and 26±14 nm, respectively.

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