Key Takeaways & Executive Findings
- •• • The AgTe monolayer intercalation decouples the GY nanowire from the Ag(111) substrate, as evidenced by the emergence of clear VBM and CBM peaks in STS, with a measured bandgap of 2.0 eV for the GY nanowire on AgTe, compared to obscured features on Ag(111). This decoupling is critical for reliable electronic characterization and device integration. • • The AgTe monolayer exhibits a bandgap of 0.95 eV (VBM at -320 mV, CBM at 630 mV), and the heterostructure forms a type-I band alignment, confining both electrons and holes in the GY nanowire. This alignment is essential for applications in light emission and quantum confinement. • • The lattice constant of the AgTe monolayer is measured to be 0.48 nm, consistent with previous reports, confirming the structural integrity of the intercalated layer. This precise lattice matching is vital for scalable heteroepitaxy. • • The work function difference between GY nanowire and AgTe drives electron transfer from GY to AgTe, leading to Fermi level alignment and type-I heterostructure formation. This charge engineering mechanism provides a tunable parameter for designing future 1D/2D heterostructures with desired electronic functionalities.
Abstract
The precise and controllable synthesis of one-dimensional (1D) and two-dimensional (2D) heterostructures, coupled with the manipulation of their atomic and electronic configurations, is of paramount significance. However, due to the synthetic challenges associated with graphyne (GY) materials, their integration into 1D/2D heterostructures remains considerably difficult. Herein, we demonstrate a post-synthetic intercalation strategy for tellurium onto Ag(111), enabling the controllable fabrication of 1D-GY-nanowire/2D-AgTe-monolayers heterostructures. Scanning-probe microscopies are employed to characterize morphological evolution during the intercalation process. Scanning tunneling spectroscopy results confirm that AgTe monolayer intercalation induces interfacial decoupling of the graphyne nanowires. Density functional theory calculations demonstrate that work function-driven Fermi level modulation via interfacial charge engineering assigns the 1D-GY-nanowire/2D-AgTe-monolayers heterostructures as type-I heterostructures. Our work not only significantly advances the fundamental understanding of interfacial interactions in 1D/2D heterostructures but also presents a scalable strategy for designing heterostructures with tailored electronic functionalities, thereby opening new avenues for applications in advanced nanoelectronics and optoelectronic devices.
1. Introduction
The integration of one-dimensional (1D) and two-dimensional (2D) materials into heterostructures is a promising route for advanced nanoelectronics and optoelectronics. However, the synthesis of graphyne (GY) nanowires and their subsequent incorporation into 1D/2D heterostructures has been hindered by the lack of scalable fabrication methods and the strong electronic coupling with metallic substrates, which obscures their intrinsic properties. Existing approaches often rely on direct growth on metal surfaces, leading to interfacial interactions that mask the electronic structure of the GY nanowires.
This work addresses these bottlenecks by employing a post-synthetic intercalation strategy, where tellurium is intercalated beneath GY nanowires on Ag(111) to form a semiconducting AgTe monolayer. This buffer layer effectively decouples the GY nanowires from the metal substrate, enabling the unambiguous determination of their electronic bandgap and the formation of a type-I heterostructure. The method provides a scalable pathway to fabricate mixed-dimensional heterostructures with tailored electronic properties, overcoming the limitations of previous direct-growth techniques.
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Yuhang Yang, Jianchen Lu, Ruiping Duan, Guang Zhang, Wei Xiong, Boyu Fu, Gefei Niu, Shijie Sun, Lei Gao, Long Chen, Jinming Cai (2026). Experimental Realization of Mixed-Dimensional 1D-Graphyne-Nanowires/2D-AgTe-Monolayer Heterostructures. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-026-4114-5
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Frequently Asked Questions
What is the measured bandgap of the GY nanowire on the AgTe monolayer, and how does it compare to the theoretical value on Ag(111)?
The measured bandgap of the GY nanowire on the AgTe monolayer is 2.0 eV, as determined by STS (VBM at -840 mV, CBM at 1160 mV). This is larger than the calculated bandgap on Ag(111), indicating that the AgTe monolayer effectively decouples the nanowire from the substrate, preserving its intrinsic electronic structure.
How does the intercalation of tellurium affect the structural integrity of the GY nanowires?
The intercalation process preserves the structural integrity of the GY nanowires, as confirmed by STM imaging. The nanowires remain intact and are fully transferred onto the AgTe monolayer, with the underlying honeycomb lattice of AgTe clearly visible, indicating a clean and complete intercalation.
What is the mechanism behind the formation of a type-I heterostructure in this system?
The type-I heterostructure arises from the work function difference between the GY nanowire and the AgTe monolayer. Since the work function of GY is smaller than that of AgTe, electrons transfer from GY to AgTe upon contact, aligning the Fermi levels. This electron accumulation in AgTe results in a straddling band alignment, confining both electrons and holes in the GY nanowire.
What are the potential scalability challenges of this intercalation strategy for industrial applications?
The intercalation strategy is performed under ultra-high vacuum conditions, which may limit large-scale production. However, the process is controllable and reproducible, and the use of tellurium intercalation is a well-established technique. Further optimization of growth parameters and transfer methods could enhance scalability for practical device fabrication.
How does the electronic decoupling achieved by the AgTe monolayer benefit the characterization and application of GY nanowires?
The AgTe monolayer decouples the GY nanowires from the metallic Ag(111) substrate, eliminating strong electronic interference. This allows for clear identification of the VBM and CBM in STS, enabling accurate bandgap measurement and band alignment determination. This is crucial for integrating GY nanowires into functional electronic and optoelectronic devices where precise electronic properties are required.
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