Graphene nanoribbons with large ferroelectricity

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K21126
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 28:Nano/micro science and related fields
• Research Institution: Kyoto University
• Principal Investigator: Sakaguchi Hiroshi 京都大学, エネルギー理工学研究所, 教授 (30211931)
• Project Period (FY): 2020-07-30 – 2022-03-31
• Keywords: ナノ炭素 / 物質創成

Outline of Final Research Achievements

Conventionally, hydrocarbon-type precursors designed for organic synthesis of asymmetric GNR have succeeded in polymerization, but rearrangement reactions occur during dehydrogenation condensation, so GNR with the desired structure could not be generated. To solve this problem, we designed a new asymmetric Z-type precursor and developed a new organic synthesis method for asymmetric GNR. A molecular design was performed with bromine and boron as precursors and chlorine in the center. This precursor was subjected to head-to-tail polymerization using a Pd catalyst to synthesize an asymmetric precursor polymer. Next, this precursor polymer was subjected to a dehydrochlorination reaction using another Pd catalyst to obtain a partially condensed ring polymer. Furthermore, asymmetric GNR was obtained by performing a dehydrogenation-condensation reaction of the remaining hydrocarbon moiety using DDQ. Based on the above, we succeeded in synthesizing the asymmetrical GNR.

Free Research Field

ナノ科学

Academic Significance and Societal Importance of the Research Achievements

強誘電性を持つ新しいグラフェンナノリボン（GNR）の合成は、従来炭化水素に限定されていたGNRの化学構造を一新し、非対称性電子構造を生み出すこにより、強誘電性等の新たな物性を付与することが可能となる。本研究で得られた成果は、この新しい機能を創成する道を拓くことに貢献する。