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UV-Attenuated total reflectance spectroscopy : a powerful tool for interfacial processes analysis
Maria Antoaneta Bratescu,Nagahiro Saito,Osamu Takai 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
Attenuated total reflectance (ATR) spectroscopy was used to investigate the adsorption of coumarin organosilane monolayer onto a fused silica surface. The difference between the absorption spectra of the molecules on the surface and in solution was explained by the interaction of the adsorbed coumarin organosilane molecules with the hydroxyl groups on the fused silica surface. This interaction produces a perturbation of the π electron distribution and the electronic transitions of the coumarin chromophore of the organosilane molecules adsorbed on the surface. From the kinetics adsorption curves, the calculated enthalpy values and free energy indicate a chemisorption process. The high sensitivity of ATR spectroscopy allows the detection of a monolayer formed by a 10 nM concentration of coumarin organosilane molecules.