Electronic structure, adsorption geometry, and photoswitchability of azobenzene layers adsorbed on layered crystals

Literature Information

Publication Date 2013-10-14
DOI 10.1039/C3CP53003E
Impact Factor 3.676
Authors

Eric Ludwig, Thomas Strunskus, Stefan Hellmann, Alexei Nefedov, Christof Wöll, Lutz Kipp, Kai Rossnagel


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Abstract

Mono- and multilayers of the molecular photoswitch azobenzene were adsorbed on two layered transition-metal dichalcogenides, semiconducting HfS2 and metallic TiTe2, at temperatures of 80–120 K and investigated in situ using valence-band and core-level photoelectron spectroscopy as well as near-edge X-ray absorption fine structure spectroscopy. The spectroscopic results indicate similar growth modes on the two substrates. In the monolayer systems, the azobenzene molecules tend to lie flat on the surface with average tilt angles of <15°, whereas the multilayer systems show a larger average tilt angle of 35–45°, depending on substrate surface conditions. The chemical environment of azobenzene, as investigated by XPS, does not change significantly from mono- to multilayers suggesting weak adsorbate–substrate coupling for the molecular layer that forms the interface with the substrate. Irradiation with ultraviolet light with a wavelength of 365 nm leads to a partial rearrangement of the adsorbed azobenzene molecules with a trans-to-cis conversion of up to 35%.

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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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