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Electrically-Assisted Formation and Desorption of Dodecyl Phosphate Self-Assembled Monolayers on Indium Tin Oxide Surfaces
Auteur(s)
Tang, Clarence S.
Antoni, Mathieu
Schönbächler, Isabelle
Keller, Beat
Textor, Marcus
Voros, Janos
Date de parution
2005
In
ESC Transactions (208th ECS Meeting : Dielectrics and the Dielectric-Electrolyte Interface in Biological and Biomedical Applications), Electrochemical Society, 2005/1/28/29-43
Résumé
Molecularly homogenous and hydrophobic surfaces play an important role in a number of technological applications such as tribology and protein/cellular adhesion. Self-assembled monolayers of dodecyl phosphates (DDPO<sub>4</sub>) have previously been demonstrated to spontaneously form on titanium oxide, producing surfaces with excellent hydrophobic properties. In this paper, we report on the adsorption of DDPO4 onto a transparent electronic material, indium tin oxide (ITO), under both open circuit and applied potential conditions. We have used two complementary surface characterization techniques: variable angle scanning ellipsometry and contact angle measurements to investigate the adsorption of DDPO<sub>4</sub> on an ITO surface. Under open circuit condition, both methods consistently confirmed the formation of DDPO<sub>4</sub> monolayers on the ITO surface. The presence of an electrical field increased the amount of DDPO<sub>4</sub> adsorbed on the ITO surface. An applied anodic electrical stimulus of 1800 mV resulted in an exponential loss of the monolayer as confirmed by X-ray photoelectron spectroscopy and electrochemical optical waveguide lightmode spectroscopy (EC-OWLS). This electrically stimulated selective adsorption/desorption of DDPO<sub>4</sub> opens up new ways to tailor the physico-chemical properties of surfaces.
Identifiants
Type de publication
journal article
