Adsorption Studies of Organophosphonic Acids on Differently Activated Gold Surfaces

作者：Niegelhell Katrin; Leimgruber Simon; Griesser Thomas; Brandl Christian; Chernev Boril; Schennach Robert; Trimmel Gregor; Spirk Stefan^*

来源：Langmuir, 2016, 32(6): 1550-1559.

DOI：10.1021/acs.langmuir.5b04467

In this study, the formation of self-assembled monolayers consisting of three organophosphonic acids (vinyl-, octyl-, and tetradecylphosphonic acid) from isopropanol solutions onto differently activated gold surfaces is studied in situ and in real time using multiparameter surface plasmon resonance (MP-SPR). Data retrieved from MP-SPR measurements revealed similar adsorption kinetics for all investigated organophosphonic acids (PA). The layer thickness of the immobilized PA is in the range of 0.6-1.8 nm corresponding to monolayer-like coverage and correlates with the length of the hydrocarbon chain of the PA molecules. After sintering the surfaces, the PA are irreversibly attached onto the surfaces as proven by X-ray photoelectron spectroscopy and attenuated total reflection infrared and grazing incidence infrared spectroscopy. Potential adsorption modes and interaction mechanisms are proposed.

• 出版日期2016-2-16