SKM 2021 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 4: Poster

DS 4.22: Poster

Dienstag, 28. September 2021, 10:00–13:00, P

Vibrational spectroscopic characterization of local electrochemical modification of graphene — Tilmann Neubert^1,2,3,4, Jörg Rappich¹, Kannan Balasubramanian^3,4, and •Karsten Hinrichs^2,3 — ¹Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium Photovoltaik, Kekuléstr. 5, 12489, Berlin — ²ISAS - e.V., In Situ Spectroscopy Group, Schwarzschildstr. 8, 12489 Berlin — ³HU Berlin, School of Analytical Sciences Adlershof (SALSA), Unter den Linden 6, 10117 Berlin — ⁴Department of Chemistry, HU Berlin, Unter den Linden 6, 10117 Berlin

Local properties of an electrochemical modification and the underlying graphene between the contacts of a field effect transistor (FET) were analyzed by Raman and infrared (IR) spectroscopies. IR spectroscopic ellipsometry (IRSE) enabled us to probe spots from about 0.1 to a few mm, IR microscopy of a few 10 µm, Raman of about 1 µm, photothermal AFM-IR at the nm-scale. For graphene surfaces modified electrochemically with maleimidophenyl (MP) or 4-Aminophenyl acetic acid (4-APhAA) the interpretation of Raman spectra allowed a detailed characterization of the graphene properties whereas IR is used for identification of characteristic molecular vibrations of the functional layers. The Raman spectra reveal if the electrochemically formed oligomers are covalently bound or physically adsorbed. AFM-profiles and IRSE interpretation reveal similar thicknesses of the deposited (a few nm thick) layers. Funding: EFRE 1.8/13 and SALSA.