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다차원 탄소재료 연구단
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Tip Growth of Quasi-Metallic Bilayer Graphene Nanoribbons with Armchair Chirality

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Title
Tip Growth of Quasi-Metallic Bilayer Graphene Nanoribbons with Armchair Chirality
Author(s)
Lou, Shuo; Lyu, Bosai; Chen, Jiajun; Zhou, Xianliang; Jiang, Wenwu; Lu Qiu; Shen, Peiyue; Ma, Saiqun; Zhang, Zhichun; Xie, Yufeng; Wu, Zhenghan; Chen, Yi; Xu, Kunqi; Liang, Qi; Watanabe, Kenji; Taniguchi, Takashi; Xian, Lede; Zhang, Guangyu; Ouyang, Wengen; Feng Ding; Shi, Zhiwen
Publication Date
2024-01
Journal
Nano Letters, v.24, no.1, pp.156 - 164
Publisher
American Chemical Society
Abstract
Graphene nanoribbons (GNRs), quasi one-dimensional (1D) narrow strips of graphene, have shown promise for high-performance nanoelectronics due to their exceptionally high carrier mobility and structurally tunable bandgaps. However, producing chirality-uniform GNRs on insulating substrates remains a big challenge. Here, we report the successful growth of bilayer GNRs with predominantly armchair chirality and ultranarrow widths (<5 nm) on insulating hexagonal boron nitride (h-BN) substrates using chemical vapor deposition (CVD). The growth of GNRs is catalyzed by transition metal nanoparticles, including Fe, Co, and Ni, through a unique tip-growth mechanism. Notably, GNRs catalyzed by Ni exhibit a high purity (97.3%) of armchair chirality. Electron transport measurements indicate that the ultrathin bilayer armchair GNRs exhibit quasi-metallic behavior. This quasi-metallicity is further supported by density functional theory (DFT) calculations, which reveal a significantly reduced bandgap in bilayer armchair GNRs. The chirality-specific GNRs reported here offer promising advancements for the application of graphene in nanoelectronics. © 2023 American Chemical Society.
URI
https://pr.ibs.re.kr/handle/8788114/14692
DOI
10.1021/acs.nanolett.3c03534
ISSN
1530-6984
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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