Atomically Precise PdSe<sub>2</sub> Pentagonal Nanoribbons.
basic_science · Level V
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- Record sourced from PubMed, PMID 32023412.
- Also identified by DOI 10.1021/acsnano.9b08390.
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Abstract
We report atomically precise pentagonal PdSe<sub>2</sub> nanoribbons (PNRs) fabricated on a pristine PdSe<sub>2</sub> substrate with a hybrid method of top-down and bottom-up processes. The PNRs form a uniform array of dimer structure with a width of 2.4 nm and length of more than 200 nm. <i>In situ</i> four-probe scanning tunneling microscopy (STM) reveals metallic behavior of PNRs with ballistic transport for at least 20 nm in length. Density functional theory calculations produce a semiconducting density of states of isolated PNRs and find that the band gap narrows and disappears quickly once considering coupling between PNR stacking layers or interaction with the PdSe<sub>2</sub> substrate. The coupling of PNRs is further corroborated by Raman spectroscopy and field-effect transistor measurements. The facile method of fabricating atomically precise PNRs offers an air-stable functional material for dimensional control.