journal article·2022-07

Catalytic Growth of Ultralong Graphene Nanoribbons on Insulating Substrates

Bosai Lyu, Jiajun Chen, Shuo Lou, Can Li, Lu Qiu, Wengen Ouyang, Jingxu Xie, Izaac Mitchell, Tongyao Wu, Aolin Deng, Cheng Hu, Xianliang Zhou, Peiyue Shen, Saiqun Ma, Zhenghan Wu, Kenji Watanabe, Takashi Taniguchi, Xiaoqun Wang, Qi Liang, Jinfeng Jia, Michael Urbakh, Oded Hod, Feng Ding, Shiyong Wang, Zhiwen Shi

Advanced Materials· Volume 34· Issue 28
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Abstract

Abstract Graphene nanoribbons (GNRs) with widths of a few nanometers are promising candidates for future nanoelectronic applications due to their structurally tunable bandgaps, ultrahigh carrier mobilities, and exceptional stability. However, the direct growth of micrometer‐long GNRs on insulating substrates, which is essential for the fabrication of nanoelectronic devices, remains an immense challenge. Here, the epitaxial growth of GNRs on an insulating hexagonal boron nitride (h‐BN) substrate through nanoparticle‐catalyzed chemical vapor deposition is reported. Ultranarrow GNRs with lengths of up to 10 µm are synthesized. Remarkably, the as‐grown GNRs are crystallographically aligned with the h‐BN substrate, forming 1D moiré superlattices. Scanning tunneling microscopy reveals an average width of 2 nm and a typical bandgap of ≈1 eV for similar GNRs grown on conducting graphite substrates. Fully atomistic computational simulations support the experimental results and reveal a competition between the formation of GNRs and carbon nanotubes during the nucleation stage, and van der Waals sliding of the GNRs on the h‐BN substrate throughout the growth stage. This study provides a scalable, single‐step method for growing micrometer‐long narrow GNRs on insulating substrates, thus opening a route to explore the performance of high‐quality GNR devices and the fundamental physics of 1D moiré superlattices.
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Research context

OpenAlex topics: Graphene research and applications · 2D Materials and Applications · Nanowire Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) Shenyang National Laboratory for Materials Science School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China

Collaborative Innovation Centre of Advanced Microstructures Nanjing University Nanjing 210093 China

Centre for Multidimensional Carbon Materials Institute for Basic Science Ulsan 44919 South Korea

School of Materials Science and Engineering Ulsan National Institute of Science and Technology Ulsan 44919 South Korea

Department of Engineering Mechanics School of Civil Engineering Wuhan University Wuhan Hubei 430072 China

Research Centre for Functional Materials National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan

International Centre for Materials Nanoarchitectonics National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan

Tsung‐Dao Lee Institute Shanghai Jiao Tong University Shanghai 200240 China

Department of Physical Chemistry School of Chemistry and The Sackler Centre for Computational Molecular and Materials Science The Raymond and Beverly Sackler Faculty of Exact Sciences Tel Aviv University Tel Aviv 6997801 Israel

Funding

National Natural Science Foundation of China · Institute for Basic Science · Israel Science Foundation · Shanghai Jiao Tong University

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