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BP: Fachverband Biologische Physik

BP 13: DNA/RNA and Related Enzymes

BP 13.12: Vortrag

Mittwoch, 28. März 2012, 12:45–13:00, H 1058

Nucleobase adsorbed at graphene devices: enhance bio-sensorics — •Bo Song¹, Gianaurelio Cuniberti², Stefano Sanvito³, and Haiping Fang¹ — ¹Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800, China — ²Institute for Materials Science and Max Bergmann Center of Biomaterials, Dresden University of Technology, 01062 Dresden, Germany — ³School of Physics and CRANN, Trinity College, Dublin 2, Ireland

Graphene as a good material for sensing single small molecules, is hardly believed to identify bio-molecules via electrical currents. This is because bio-molecules tend to bind to graphene through non-covalent bonds, such as π-π stacking interaction, which is not customarily considered to induce a clear perturbation of the graphene electronic structure. In contrast to these expectations, we demonstrate that oxygen in nucleobases adsorbed on graphene with π-π stacking interaction, can clearly alter the electric current, even in water at room temperature. This property allows us to devise the strategies employing graphene as material of choice in bio-sensorics, bio-chips.