Real-time PMIRRAS studies of in situgrowth of C11Eg6OMe on gold and immersion effects

Literature Information

Publication Date 2010-06-08
DOI 10.1039/B923691K
Impact Factor 3.676
Authors

Stefan Zorn, Alexander Gerlach, Frank Schreiber


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Abstract

We studied the growth of self-assembling monolayers of C11Eg6OMe on gold under aqueous conditions. With the help of polarisation modulation infrared reflection absorption spectroscopy (PMIRRAS) we monitored the evolution of characteristic absorption modes in the fingerprint region (1050–1500 cm−1) during the later stages of the growth of the SAM. We observed a change from rather amorphous structure with mixed all-trans and helical conformation to an ordered structure with predominantly helical structure over time. Changes of mode positions, intensities and broadness can be described by a single exponential. In addition, we investigated the effect of hydration for SAMs with different degrees of crystallinity. To that end, we compared their spectra at certain ordering levels in contact with aqueous solution with the corresponding spectra in air. SAMs with a highly ordered crystalline structure in air show the same structure under aqueous conditions. However, SAMs which are still crystalline in air, but less perfect, show rather amorphous spectral features under aqueous conditions indicating a strong interaction with water. This implies that the ability of water to penetrate the EG moiety strongly depends on its structure which in turn is related inter alia to the surface coverage. Since the interaction with water plays an important role in the prevention of unspecific adsorption on oligo(ethylene glycols) this is important for its application. Our experiments also underline the importance of the in situ analysis of the film structure.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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