Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 29: Poster II
HL 29.8: Poster
Dienstag, 18. März 2025, 18:00–20:00, P1
Microscopic, Optical, and Electrical Characterization of Spray-Coated Graphene Dispersions on Sapphire Substrates — •Yasaman Jarrahi Zadeh1, Lars Grebener2, Muhammad Ali3, Felix Schaumburg1, Mohaned Hammad2, Günther Prinz1, Martin Geller1, Hartmut Wiggers3, 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 — 3Institute for Combustion and Gas Dynamics, and CENIDE, University of Duisburg-Essen, Germany
Processing graphene into thin films is crucial for its potential in cutting-edge applications. Here, we report on different characterization techniques to analyze the dispersion and coating performance of spray-coated graphene films on sapphire substrates. The deposited films were characterized using optical and scanning electron microscopy to evaluate coating morphology. Raman Spectroscopy and electrical characterization were used to assess the structural integrity and functional performance of the constituent graphene sheets. The deposited films fabricated from graphene sheets dispersed in water with carboxymethyl cellulose (CMC) exhibited uniform surface morphology compared to deposition with ethanol dispersion. Raman spectroscopy and electrical characterization confirmed the quality and structural integrity of the water-CMC dispersion. This study highlights key process-structure relationships for optimizing dry-synthesized graphene films for advanced technologies.
Keywords: Graphene; Optical characterization; Conductivity; Electrical characterization; Dispersion properties