Inhaltszusammenfassung

Plenty of bio-medical and industrially relevant processes take place at solid-liquid interfaces. The mechanisms underlying these macroscale solid-liquid interfacial processes are at the molecular scale, i.e. molecules (and/or ions) in the liquid phase interact with atoms or molecules at the solid surface. This dissertation discusses the development of a tip-enhanced Raman spectroscopy (TERS) setup to probe molecules and their interactions with the environment at solid-liquid interfaces. TERS ...Plenty of bio-medical and industrially relevant processes take place at solid-liquid interfaces. The mechanisms underlying these macroscale solid-liquid interfacial processes are at the molecular scale, i.e. molecules (and/or ions) in the liquid phase interact with atoms or molecules at the solid surface. This dissertation discusses the development of a tip-enhanced Raman spectroscopy (TERS) setup to probe molecules and their interactions with the environment at solid-liquid interfaces. TERS is a surface-sensitive technique that is not only sensitive to small numbers of molecules with a nanometric lateral spatial resolution, but also provides chemical specificity enabling identification of molecules and probing of their interactions with their environment. Furthermore, TERS enables in situ investigation of molecules at room temperature, in ambient atmosphere and under atmospheric pressure. The home-designed solid-liquid TER spectrometer enables the investigation of molecules at the surface of opaque substrates under a 6.6 mm thick layer of water. The TER spectrometer can obtain TERS maps, of which the lateral spatial resolution is 12.6 nm (measured in air). Solid-liquid TERS has been applied to investigate the interaction between benzene-1,3,5-tricarboxylic acid (BTC) and a monolayer of Cu/Au in air and under water. Spectral changes in TER spectra were observed upon immersing the BTC/Cu/Au substrate in water. The observed spectral changes suggest a change in binding geometry of BTC on the Cu/Au substrate upon water immersion. The results discussed in this thesis show that the developed solid-liquid TER spectrometer can be used to investigate ensembles of molecules at Au-water interfaces. Further technical improvements will enable the general use of solid-liquid TERS for nanometric investigation of molecules at solid-liquid interfaces.» weiterlesen» einklappen

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Klassifikation

DDC Sachgruppe:
Chemie