Atomically Precise PdSe₂ Pentagonal Nanoribbons

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional materials like palladium diselenide (PdSe2) offer unique electronic properties.
• Precise control over nanostructure dimensions is crucial for tailoring material functionality.

Purpose of the Study:

• To fabricate and characterize atomically precise pentagonal palladium diselenide nanoribbons (PNRs).
• To investigate the electronic transport properties and structural characteristics of these PNRs.

Main Methods:

• Hybrid fabrication combining top-down and bottom-up approaches.
• In situ four-probe scanning tunneling microscopy (STM) for transport measurements.
• Density functional theory (DFT) calculations for electronic structure analysis.
• Raman spectroscopy and field-effect transistor (FET) measurements for corroboration.

Main Results:

• Uniform array of pentagonal PdSe2 nanoribbons (PNRs) with 2.4 nm width and >200 nm length.
• PNRs exhibit metallic behavior and ballistic transport over at least 20 nm.
• DFT predicts semiconducting isolated PNRs, but band gap closure upon coupling or substrate interaction.
• Experimental data confirms PNR coupling and influences electronic properties.

Conclusions:

• Atomically precise PNRs can be fabricated using a facile hybrid method.
• Coupling effects significantly alter the electronic properties of PNRs, leading to metallic behavior.
• These air-stable PNRs represent a promising functional material with controlled dimensions for electronic applications.