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Tailoring Graphite into Subnanometer Graphene.

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Advanced Materials (Deerfield Beach, Fla.)
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Summary

Researchers developed a novel physical method to create sub-nanometer graphene materials (GSNs). These GSNs exhibit significantly enhanced photoluminescence and nonlinear absorption due to their unique broken lattice structure.

Keywords:
broken latticegraphenenonlinear saturation absorptionphotoluminescencesub‐1 nm

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Area of Science:

  • Materials Science
  • Nanoscience and Nanotechnology

Background:

  • Extremely downsized materials, including quantum-sized and subnanometer-sized ones, are gaining interest.
  • Producing these materials effectively and controllably using physical methods presents a significant challenge.

Purpose of the Study:

  • To report an all-physical top-down method for producing sub-1 nm graphene with a completely broken lattice.
  • To characterize the properties of these novel graphene subnanometer materials (GSNs).

Main Methods:

  • An all-physical top-down strategy was employed.
  • Sub-1 nm graphene materials with monolayer structures and lateral sizes of approximately 0.5 nm were successfully produced.

Main Results:

  • The synthesized graphene subnanometer materials (GSNs) exhibit monolayer structures and lateral sizes of ~0.5 nm.
  • Compared to bulk, nanosheets, and quantum sheets, GSNs show dramatically enhanced photoluminescence and nonlinear saturation absorption.
  • Unique carrier behavior was observed in GSNs.

Conclusions:

  • The extreme performances of GSNs are attributed to non-equilibrium states induced by their entirely exposed and broken intrinsic lattices.
  • This work highlights the potential of broken lattice structures in subnanometer materials.
  • New insights into the development and application of subnanometer materials are provided.