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Neurotransmitter derivatives are chemisorbed onto gold surfaces to produce model systems to be used for biosensor- and nanoscience applications. The electronic structure, molecular orientation, the composition of these neurotransmitter derivatives and the chemical binding to the gold substrates, were investigated by means of X-ray Photoelectron Spectroscopy (XPS), Infrared Reflection-Absorption Spectroscopy (IRAS) and Near-edge X-ray Absorption Fine Structures (NEXAFS). Both NEXAFS and IRAS results showed well-ordered structures on the gold surfaces. The average tilt of the main molecular axis and of the aromatic ring was estimated for respective system based on the NEXAFS results. The thickness of the neurotransmitter derivatives onto the surfaces was investigated using ellipsometry and the values were supported by XPS based estimation of the monolayer thickness.
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