Graphene nanonet for biological sensing applications.

Authors:
Taekyeong Kim
Taekyeong Kim
Seoul National University
Jaesung Park
Jaesung Park
Pohang University of Science and Technology
South Korea
Hye Jun Jin
Hye Jun Jin
Seoul National University
Hyungwoo Lee
Hyungwoo Lee
Seoul National University
Kyung-Eun Byun
Kyung-Eun Byun
Seoul National University
Kwang S Kim
Kwang S Kim
Center for Superfunctional Materials
South Korea
Byung Hee Hong
Byung Hee Hong
Sungkyunkwan University

Nanotechnology 2013 Sep 21;24(37):375302. Epub 2013 Aug 21.

Department of Physics and Astronomy, Seoul National University, Seoul, Korea.

We report a simple but efficient method to fabricate versatile graphene nanonet (GNN)-devices. In this method, networks of V2O5 nanowires (NWs) were prepared in specific regions of single-layer graphene, and the graphene layer was selectively etched via a reactive ion etching method using the V2O5 NWs as a shadow mask. The process allowed us to prepare large scale patterns of GNN structures which were comprised of continuous networks of graphene nanoribbons (GNRs) with chemical functional groups on their edges. The GNN can be easily functionalized with biomolecules for fluorescent biochip applications. Furthermore, electrical channels based on GNN exhibited a rather high mobility and low noise compared with other network structures based on nanostructures such as carbon nanotubes, which was attributed to the continuous connection of nanoribbons in GNN structures. As a proof of concept, we built DNA sensors based on GNN channels and demonstrated the selective detection of DNA. Since our method allows us to prepare high-performance networks of GNRs over a large surface area, it should open up various practical biosensing applications.

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http://dx.doi.org/10.1088/0957-4484/24/37/375302DOI Listing
September 2013
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