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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

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Liquid-Processed 2D Aromatic Amorphous Carbon: Defect Engineering and Universal Transport Scaling.

Fabiola Liscio1, Andrea Fondacaro2, Gaetana Petrone3

  • 1Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati, (CNR-ISMN) - Bologna Unit, Bologna, Italy.

Small (Weinheim an Der Bergstrasse, Germany)
|February 19, 2026
PubMed
Summary

Researchers developed a new method to create 2D amorphous carbon films from graphene oxide. This process uses rapid thermal quenching to control defects, leading to unique electronic properties in quenched reduced graphene oxide (qRGO).

Keywords:
2D phase transitionamorphous 2D materialscharge transportdisordered systemsgraphene‐based materials

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • 2D aromatic amorphous carbons with sp2 networks offer scalability and unique electronic transport.
  • Graphene oxide's water processability presents an opportunity for scalable synthesis of 2D carbon materials.

Purpose of the Study:

  • To develop a deterministic method for producing graphene-derived 2D amorphous carbon thin films.
  • To investigate the structural and electronic properties of these novel materials.

Main Methods:

  • Combining water-processable graphene oxide with rapid thermal quenching.
  • Utilizing X-ray Photoelectron Spectroscopy (XPS) and Ultraviolet Photoelectron Spectroscopy (UPS) for chemical state analysis.
  • Employing correlative structural and spectroscopic analyses to characterize defects.
  • Conducting transport measurements to study electronic behavior.

Main Results:

  • A kinetically trapped quasi-amorphous phase, quenched reduced graphene oxide (qRGO), was successfully produced.
  • qRGO exhibits predominantly sp2 bonding, forming a distorted aromatic network.
  • qRGO shows suppressed long-range order and boundary-like defects, distinct from nanocrystalline RGO.
  • Electronic transport in qRGO is governed by variable-range hopping, characteristic of a strongly disordered regime.
  • Both RGO and qRGO exhibit universal power-law scaling of resistivity.

Conclusions:

  • Thermal-kinetic control over oxygen-driven defect formation is a scalable route to functional 2D amorphous carbon films.
  • The developed method allows for precise tuning of material properties for specific applications.