Dresden 2014 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 98: Graphene: Spintronics, transistors, and sensors (with DY/MA/O/TT)
HL 98.9: Talk
Thursday, April 3, 2014, 17:15–17:30, POT 081
Functionalization of Graphene for Bioelectronic Applications — •Alina Lyuleeva1, Lucas Hess1, Frank Deubel2, and Jose Antonio Garrido1 — 1Walter Schottky Institut, TU München, 85748 Garching — 2Wacker Chemie AG, 81379 München, Germany
With its fascinating structural, chemical and electronic properties, graphene outperforms many materials and is expected to pare the way for a vast range of applications such as transparent electrodes, energy storage devices, high-frequency electronics, or biosensors. The performance of the devices for these various applications can be enhanced with the help of surface functionalization, allowing a versatile modification of the properties of this material. Here, we report on the covalent and thus robust functionalization of CVD graphene with enzymes for the development of novel devices for bioelectronic applications. Graphene solution-gated field-effect transistors (SGFETs) are functionalized using a controlled grafting of polymethacrylate (PMA) brushes. We will show how this material platform can be used for further functionalization with the enzyme acetylcholinesterase (AChE). The enzymes' activity can be monitored with the modified-graphene transistor allowing both the measurement of the concentration of the neurotransmitter acetylcholine as well as the inhibition of the enzyme by neurotoxins such as nerve agents or pesticides. Our study demonstrates the potential of graphene-based functionalized transistors for biosensing and bioelectronic application.