Chiral Monolayers with Achiral Tetrapod Molecules on Highly Oriented Pyrolytic Graphite

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

2 Scopus Citations
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Author(s)

  • Hitoshi Asakawa
  • Sayaka Matsui
  • Quang Thang Trinh
  • Yasuhide Inokuma
  • Tomoki Ogoshi
  • Saki Tanaka
  • Kayo Komatsu
  • Akio Ohta
  • Tsuyoshi Asakawa
  • Takeshi Fukuma

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)7760-7767
Journal / PublicationJournal of Physical Chemistry C
Volume124
Issue number14
Online published18 Mar 2020
Publication statusPublished - 9 Apr 2020

Abstract

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 π-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.

Research Area(s)

  • ATOMIC-FORCE MICROSCOPY, LIQUID, SEMICONDUCTORS, DERIVATIVES, ORIGIN

Citation Format(s)

Chiral Monolayers with Achiral Tetrapod Molecules on Highly Oriented Pyrolytic Graphite. / Asakawa, Hitoshi; Matsui, Sayaka; Trinh, Quang Thang; Hirao, Hajime; Inokuma, Yasuhide; Ogoshi, Tomoki; Tanaka, Saki; Komatsu, Kayo; Ohta, Akio; Asakawa, Tsuyoshi; Fukuma, Takeshi.

In: Journal of Physical Chemistry C, Vol. 124, No. 14, 09.04.2020, p. 7760-7767.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review