Berlin 2018 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Organic Thin Films, Organic-Inorganic Interfaces: Session II (joint session DS/CPP)

DS 36.4: Vortrag

Freitag, 16. März 2018, 10:15–10:30, H 0111

Graphene based biosensing surfaces studied by IR-nanopolarimetry — •Karsten Hinrichs¹, Timur Shaykhutdinov¹, Christoph Kratz¹, Felix Rösicke², Cristoph Arenz³, Norbert H. Nickel², and Jörg Rappich² — ¹Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Schwarzschildstr 8, 12489 Berlin, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium Photovoltaik, Kekuléstr. 5, 12489, Berlin, Germany — ³Institut für Chemie der Humboldt-Universität zu Berlin. Brook-Taylor-Str. 2, 12489 Berlin, Germany

AFM-IR based nanopolarimetry [1] for analysis of large area graphene pre-functionalized by diazonium compounds [2] and recognition of cysteine-modified peptide nucleic acid (PNA) [3] is presented. Homogeneity of the biosensing surfaces and the secondary structure of the PNA was studied by AFM-IR measurements. AFM-IR in a sensitive modus with synchronization between the pulse rate of the quantum cascade laser used as IR light source and the resonance of the cantilever can provide IR spectra in several seconds only. This facilitates direct insight into chemical composition, intermolecular interactions, and molecular orientation in nanoscale sub-ensembles.

[1] T. Shaykhutdinovet al, Supramolecular Orientation in Anisotropic Assemblies by IR Nanopolarimetry. ACS Macro Letters 2017, 598-602. [2] F. Rösicke et al, Chem. Commun. 53 (2017) 9308-9311. [3] K. Hinrichs et al, Encyclopedia of Interfacial Chemistry: Surface Science and Electrochemistry 2018.