Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.12: Poster
Dienstag, 10. März 2026, 18:00–20:00, P1
Structural and Electrical Characterization of Graphene Thin Films from Dispersions — •Yasaman Jarrahi Zadeh1, Lars Grebener2, Shaghayegh Pourdahrany3, Muhammad Ali4, Nicholas Wilson5, Mohaned Hammad2, Günther Prinz1, Martin Geller1, Michael A. Pope5, William Wong3, Hartmut Wiggers4, Doris Segets2, and Axel Lorke1 — 1Faculty of Physics, and CENIDE, University of Duisburg-Essen, Germany — 2Institute for Energy and Materials Processes, and CENIDE, University of Duisburg-Essen, Germany — 3Department of Electrical and Computer Engineering, and WIN, University of Waterloo, Canada — 4Institute for Combustion and Gas Dynamics, and CENIDE, University of Duisburg-Essen, Germany — 5Department of Chemical Engineering, and WIN, University of Waterloo, Canada
Graphene powders were produced by microwave-plasma synthesis and sonicated into ethanol or water with carboxymethyl cellulose (CMC) or di-n-dodecyl dimethylammonium bromide (DDDA) stabilizers. Using ultrasonic spray coating or Langmuir deposition, thin films were deposited on sapphire and characterized by SEM, Raman spectroscopy, and transport measurements. Water-based CMC dispersions produced the most uniform films. Raman spectra showed good structural quality (judged by the intensity ratio I2D/IG ∼ 1.5). CMC-stabilized spray-coated films (0.1 wt%) achieved the highest conductivity (2.5 mS) and mobility (11 cm2/V.s). DDDA films were more porous with lower mobility, while multilayer Langmuir films reached higher mobility (19 cm2/V.s) but reduced conductivity.
Keywords: Graphene; Optical characterization; Electrical transport; Thin-film characterization; Dispersion properties