Dresden 2006 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 24: Poster presentation
DS 24.52: Poster
Dienstag, 28. März 2006, 15:00–17:30, P2
Electrochemical Growth and Properties of Thin Polyaniline Films on p-Si (111) and Au (111): A Comparative Study — •Lidiya Komsiyska1, Georgi Staikov1, and Vessela Tsakova2 — 1Institute of Thin Films and Interfaces (ISG3), and cni-Centre of Nanoelectronic Systems for Information Technology, Research Centre Jülich, 52425 Jülich, Germany — 2Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Due to their electronic properties and stability, polyaniline (PANI) layers are attractive for application in various micro- and nano-devices for electronics and sensorics. In this contribution we report a comparative study on electrodeposition of thin PANI layers on single crystal p-Si(111) and Au(111) substrates. The mechanism of formation and the properties of electrodeposited polymer films are investigated by means of transient measurements, cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and atomic force microscopy (AFM). The analysis of potentiostatic current transients obtained on both substrates show different growth mechanisms in the initial deposition stages. PANI layers on Au(111) are characterized by a smoother surface, compactness and higher electrochemical stability. Cyclic voltammetric and impedance measurements show that the redox switching of PANI layers is influenced strongly by the electronic band structure of the substrate. The possibility for an additional modification of the PANI layers by electrochemical deposition of Au nanoparticles is also demonstrated.