Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 91: Poster IIIb (Joint session of DS and HL, organized by HL)
HL 91.10: Poster
Donnerstag, 10. März 2016, 16:00–19:00, Poster A
Towards biomedical sensing with chemically functionalized graphene FETs — •David Kaiser1, Andreas Winter1, Thomas Weimann2, and Andrey Turchanin1,3 — 1Institute for Physical Chemistry, Friedrich Schiller University Jena, Lessingstr. 10, 07743 Jena, Germany — 2Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 3Jena Center for Soft Matter (JCSM), Philosophenweg 7, 07743 Jena, Germany
Graphene field-effect transistor (GFET) biosensors can intrinsically possess a very high sensitivity up to the fM level. However, this sensitivity is difficult to achieve in combination with high selectivity and specificity of the biomolecular binding events. Thus, covalent functionalization of GFETs results in impairing the electronic structure of graphene, which significantly reduces the device mobility. The functionalization of graphene via physisorption typically causes larger distances between the analyte and graphene plane, which reduces the number of charge carriers induced in graphene per binding event. Both effects reduce sensitivity of GFET biosensors. To overcome these problems, we employ ultrathin (~ 1 nm) dielectric carbon nanomembranes (CNMs) to chemically functionalize GFETs without impairing the electronic performance. A CNM is placed on top of graphene in the manner of all-carbon van der Waals heterostructures and acts as an analyte-specific electrochemical transducer [1]. We present and analyze the electronic characteristics of the fabricated hybrid CNM/graphene FET arrays.
[1] M. Woszczyna et al. Adv. Mater. 26, 4831 (2014).