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Network Covalent Solids

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Self-Limited Embedding Alternating 585-Ringed Divacancies and Metal Atoms into Graphene Nanoribbons.

Zhengya Wang¹, Ruoting Yin¹, Jie Meng¹

¹Hefei National Research Center for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

Journal of the American Chemical Society

|April 4, 2023

Summary

Researchers created a superlattice in graphene nanoribbons (GNRs) with alternating 585-ringed divacancies and silver atoms. This breakthrough uses on-surface cascade reactions for novel graphene nanostructures with tunable electronic properties.

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Preparation and Characterization of C60/Graphene Hybrid Nanostructures

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Area of Science:

Materials Science
Surface Chemistry
Condensed Matter Physics

Background:

Graphene nanoribbons (GNRs) possess unique electronic properties, making them promising for advanced applications.
Embedding periodic 585-ringed divacancies in GNRs is theoretically predicted to yield intriguing properties but remains a significant synthetic challenge.

Purpose of the Study:

To develop a method for synthesizing GNRs with periodic 585-ringed divacancies and metal atoms.
To investigate the structural and electronic properties of these novel GNR superlattices.

Main Methods:

On-surface cascade reaction involving intramolecular cyclodehydrogenation on a Ag(111) surface.
In-situ monitoring using scanning tunneling microscopy/spectroscopy and noncontact atomic force microscopy.
First-principles calculations, including nudged elastic band calculations.

Main Results:

Successful synthesis of a GNR superlattice with alternating 585-ringed divacancies and silver atoms.
Observation of silver adatom-mediated C-H activation in the reaction pathway.
Demonstration of a strain-induced self-limiting effect controlling superlattice formation.
Characterization of a resulting band gap of approximately 1.4 eV.

Conclusions:

The study presents a novel on-surface synthesis route for GNRs with periodic single metal atoms and nonhexagonal rings.
This method opens avenues for creating multifunctional graphene nanostructures with tailored electronic properties.
The findings contribute to the on-surface synthesis of complex graphene-based materials.