Two-Step Desorption Process of Au Nanoparticles in D2O Suspension on Amino-Terminated SiO2/Si Substrate Induced by Small Thiol Molecules

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We investigated the desorption process of Au nanoparticles immobilized on an amino-terminated SiO2/Si surface in a D2O environment by in situ attenuated total reflection surface enhanced infrared absorption spectroscopy. The advantages of IR spectroscopy over other methods were demonstrated; the IR spectra are not only sensitive to the changing particle density at the surface, but also to chemical environmental changes. Therefore, the gained information obtained by IR spectroscopy and scanning electron microscopy allows us to propose a microscopic model for the desorption process of the Au nanoparticles from the substrate.