Pyrimidine and s-triazine as structural motifs for ordered adsorption on Si(100): a first principles study

Literature Information

Publication Date 2015-06-10
DOI 10.1039/C5CP01742D
Impact Factor 3.676
Authors

Wilson K. H. Ng, J. W. Liu, Zhi-Feng Liu


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Abstract

The chemisorption of pyrimidine and s-triazine, two aromatic molecules with N atoms in the aromatic ring, is studied by first principles calculations to examine not only the chemisorption energy, but also the reaction barriers and the cooperative effects. Among the reaction paths at low coverage, the formation of a cross-bridge structure with two N–Si dative bonds is almost barrierless and should be dominant at low temperature. At higher coverage and low temperature, these cross-row structures should produce an ordered zig-zag pattern, even though it is not the energetically most stable arrangement. Upon heating, the zig-zag pattern could be transformed into lines along dimer rows. These two molecules also provide structural motifs that could facilitate the formation of ordered adsorption structures on Si(100). By symmetry, the complexity of tight-bridge structures could be greatly reduced, while the X–C–X motif, with X being an electronegative atom, could provide the building blocks for cross-row bridges.

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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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