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Two-dimensional polyaniline (C3N) from carbonized organic single crystals in solid state.

Javeed Mahmood1, Eun Kwang Lee2, Minbok Jung3

  • 1Center for Dimension-Controllable Organic Frameworks, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea;

Proceedings of the National Academy of Sciences of the United States of America
|June 18, 2016
PubMed
Summary

Researchers synthesized 2D polyaniline (PANI) using a novel pyrolysis method. This new 2D PANI material exhibits high conductivity, showing promise for advanced electronic applications.

Keywords:
C3Nnitrogenated graphenepolyanilinesolid-state reactiontwo-dimensional

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) polyaniline (PANI) is of significant interest for its electronic and optoelectronic properties.
  • Synthesizing an atomically precise 2D PANI framework has been a persistent challenge despite PANI's long history.

Purpose of the Study:

  • To develop a method for synthesizing atomically well-defined 2D polyaniline.
  • To characterize the structure and electronic properties of the novel 2D PANI.

Main Methods:

  • Solid-state pyrolysis of hexaaminobenzene trihydrochloride single crystals.
  • Scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS).
  • First-principle density functional theory (DFT) calculations.

Main Results:

  • Successful synthesis of 2D PANI with a unique structure (C3N empirical formula) featuring phenyl rings sharing nitrogen atoms.
  • Experimental and theoretical elucidation of the topological and electronic band structure.
  • Pristine 2D PANI films exhibited ambipolar behavior with a Dirac point at -37 V and conductivity of 0.72 S/cm.
  • Hydrochloric acid doping dramatically increased conductivity to 1.41 × 10^3 S/cm, the highest reported for doped PANI.

Conclusions:

  • The study presents a breakthrough in synthesizing 2D PANI with a graphene-like structure but enhanced functionality due to nitrogen incorporation.
  • The high conductivity and unique properties suggest significant potential for 2D PANI in diverse applications, including wet chemistry and device fabrication.
  • This work opens new avenues for exploring nitrogen-doped 2D materials beyond traditional graphene analogs.