Chiral Monolayers with Achiral Tetrapod Molecules on Highly Oriented Pyrolytic Graphite
| Autor: | Hitoshi Asakawa, Quang Thang Trinh, Kayo Komatsu, Yasuhide Inokuma, Takeshi Fukuma, Tomoki Ogoshi, Hajime Hirao, Sayaka Matsui, Akio Ohta, Saki Tanaka, Tsuyoshi Asakawa |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Monolayers
Materials science Self-assembled monolayers 02 engineering and technology Molecules 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Organic molecules General Energy Chemical engineering Highly oriented pyrolytic graphite Monolayer Organic compounds Tetrapod (structure) Molecule Physical and Theoretical Chemistry 0210 nano-technology Molecular structure |
| Zdroj: | Journal of Physical Chemistry C. 124(14):7760-7767 |
| ISSN: | 1932-7447 |
| Popis: | 金沢大学ナノ生命科学研究所 / 金沢大学理工研究域物質化学系 The self-assembly of organic molecules at the surface of highly oriented pyrolytic graphite (HOPG) is a promising process for constructing molecular-scale architectures. However, selectable organic molecules are generally restricted to two-dimensional molecules with planar Ï-conjugated structures and alkyl chains. We herein present the formation of self-assembled monolayers of tetrakis(4-ethynylphenyl)methane (TEPM) having a three-dimensional (3D) tetrapod geometry on HOPG, which was achieved by utilizing a simple spin-coating method. The arrangements of TEPM molecules in the monolayers were investigated using frequency-modulation atomic force microscopy (FM-AFM). The resulting subnanometer-resolution FM-AFM images revealed that the TEPM molecules formed linear rows with a periodicity of 0.85 nm oriented in a parallel configuration but with two alternating intervals of 0.7 and 1.0 nm. Moreover, the TEPM monolayers were classified into two chiral types with a relationship of mutual mirror-image symmetry, according to the observed molecular arrangements. Our results demonstrate the capability of TEPM molecules to act as 3D building blocks for the design of molecular-scale architectures at interfaces. Copyright © 2020 American Chemical Society. |
| Databáze: | OpenAIRE |
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