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  • Title: Tip Growth of Quasi-Metallic Bilayer Graphene Nanoribbons with Armchair Chirality.
    Author: Lou S, Lyu B, Chen J, Zhou X, Jiang W, Qiu L, Shen P, Ma S, Zhang Z, Xie Y, Wu Z, Chen Y, Xu K, Liang Q, Watanabe K, Taniguchi T, Xian L, Zhang G, Ouyang W, Ding F, Shi Z.
    Journal: Nano Lett; 2024 Jan 10; 24(1):156-164. PubMed ID: 38147652.
    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.
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