DNA-Templated Silver Nanorings


  • The authors thank Prof. K. Endo (Kanazawa University, Japan) for fruitful discussions and Prof. T. Kanbe (Nagoya University, Japan) for help with electron microscopy observations and discussions. This work was supported in part by fellowship No. P04154 from the Japan International Science and Technology Exchange Center (JISTEC), fellowship No. P03200 from the Japanese Society for the Promotion of Science (JSPS), and a Grant-in-Aid for the 21st Century COE ‘Center for Diversity and Universality in Physics’ from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.


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Monodisperse silver rings with nanometer-scale diameters (see Figure) are produced due to the ability of DNA to organize into toroidal condensates with well-defined shapes and sizes upon its interaction with multications. Silver ions can bind to the residual negative surface charge of condensed DNA, and are then reduced to silver metal to yield DNA toroids coated with a thin silver metal shell.