Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Interfaces and Thin Films III (joint session CPP, DS)
CPP 37.4: Vortrag
Mittwoch, 18. März 2015, 10:15–10:30, C 243
Covalent modification of large area monolayer graphene towards biosensing. — •Felix Rösicke1, Marc Gluba1, Guoguang Sun2, Karsten Hinrichs2, Jörg Rappich1, and Norbert Nickel1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany — 2Leibniz - Institut für Analytische Wissenschaften - ISAS - e.V., Department Berlin, Berlin, Germany
We investigated the electrochemical grafting of para-N-maleimidophenyl (pMP) onto graphene from the respective diazonium salt (p-(N-Maleimido)benzenediazonium tetrafluoroborate, pMPDT) by electrochemical quartz crystal microbalance (EQCM), Raman- and infrared spectroscopies.
The p-MP is well known to react with any SH-group present in solution and is therefore a possible candidate to build up bio-sensing devices which, in combination with graphene, are very stable and conductive systems that can be transferred to any substrate. The sample preparation was performed by a transfer of CVD grown large area graphene [1] to an isolating layer of SiNx on Au-coated QCM chips. Using graphene as working electrode, the current behavior and the change in the resonant frequency of the EQCM reflect the electrochemical reduction of the diazonium compound. Raman and infrared spectroscopies reveal the binding of pMP onto the graphene layer. The charge used for the reduction of pMPDT correlates to the amount of grafted pMP and the observed defect density of graphene. Finally the pMP functionalized graphene surface was tested by reaction with 4-Nitrobenzenethiol.