Bottom-up synthesis of oriented graphene nanoribbons on semiconductor substrates

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K15136
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 28030:Nanomaterials-related
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: Yano Masahiro 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究職 (30783790)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Keywords: グラフェンナノリボン / 半導体 / 方位 / 表面合成

Outline of Final Research Achievements

The aim of this study was to synthesize long graphene nanoribbons (GNRs) along the periodic alignment steps on a Ge(110)-16×2 reconstructed structure. First, the orientation of the periodic alignment steps of the 16 × 2 structure was determined by slightly tilting the Ge(110) surface toward the [1-10] orientation, and the formation mechanism of the 16 × 2 structure was clarified by observing the structure formation process. Next, we found that an ordered structure is formed when the precursor molecules of GNRs are deposited on Ge(110)-16×2, but long GNRs were not obtained from this process. Since it is thought to be due to the orientation of the precursor molecules, we clarified the relationship between the orientation of the precursor molecules and the growth orientation of GNRs on the Au substrate, and obtained guidelines for controlling the growth orientation of GNRs.

Free Research Field

表面科学

Academic Significance and Societal Importance of the Research Achievements

Ge(110)-16×2はGNRのみならず様々なナノ構造を作製する上でテンプレートとなる表面だが、これまでステップ方位の制御や形成機構が不明なままとされてきた。本研究ではこれらを明らかにした成果は、ナノ構造作製技術の発展に貢献する。
また、GNRの成長方位と前駆体分子の吸着方位の関係性はAu基板上のみならず、様々な基板で応用可能だと考えられる。この成果はGNRの方位制御において重要となるため、今後のGNRデバイス設計において重要な指針となる。