Abstract
Porphyrins are large organic molecules that are interesting for different applications, such as photovoltaic cells, gas sensors, or in catalysis. For many of these applications, the interactions between adsorbed molecules and surfaces play a crucial role. Studies of porphyrins on surfaces typically fall into one of two groups: (1) evaporation onto well-defined single-crystal surfaces under well-controlled ultrahigh vacuum conditions or (2) more application-oriented wet chemical deposition onto less well-defined high surface area surfaces under ambient conditions. In this study, we will investigate the wet chemical deposition of 5-(monocarboxyphenyl)-10,15,20-triphenylporphyrin (MCTPP) on well-defined rutile TiO2(110) single crystals under ambient conditions. Prior to deposition, the TiO2(110) crystals were also cleaned wet-chemically under ambient conditions, meaning none of the preparation steps were done in ultrahigh vacuum. However, after each preparation step, the surfaces were characterized in ultrahigh vacuum with X-ray photoelectron spectroscopy (XPS) and the result was compared with porphyrin layers prepared in ultrahigh vacuum (UHV) by evaporation. The differences of both preparations when exposed to zinc ion solutions will also be discussed.
Highlights
Porphyrins are large organic macrocycles, which play a crucial role in many important processes in nature [1,2]
TiO2procedure and after subjecting thesurvey crystalspectra to the wet chemical cleaning described in the and after subjecting the crystal to the wet chemical cleaning procedure described in the experimental section above
We presented a method to clean rutile TiO2 (110) crystals and deposit molecules from solution, without the need of ultrahigh vacuum
Summary
Porphyrins are large organic macrocycles, which play a crucial role in many important processes in nature [1,2]. These colorful molecules, sometimes referred to as the “pigments of life” [3], are the functional building blocks in hemoglobin and myoglobin, where they transport and store oxygen in mammalian cells [4], in chlorophyll, where they absorb sun light [5], and in vitamin B12 , where they play an important role for the production of red blood cells and the function of the nervous system [6] The reason for their broad range of functionality is their great tunability: by incorporating different metal centers in the nitrogen pocket, and by changing the side groups of the molecule, it is possible to tailor porphyrin derivatives with specific electronic, optical, and chemical properties [7,8,9].
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