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The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration.
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Modulating the Work Function of Graphene by Pulsed Plasma Aided Controlled Chlorination.

Hiroshi Takehira1, Mohammad Razaul Karim2, Yuta Shudo1

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Chlorine doping of graphene (G) via pulsed plasma creates semiconductors. This method offers control over halogen doping levels in graphene-based materials, with GG@CHCl3 showing the lowest work function.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Graphene (G) is a promising material with tunable electronic properties.
  • Controlling the semiconductivity of graphene is crucial for electronic applications.
  • Halogen doping is a known method to modify graphene's electronic characteristics.

Purpose of the Study:

  • To develop a novel method for chlorine doping of graphene.
  • To investigate the effect of chlorine doping on graphene's work function.
  • To explore the controllability of halogen doping levels on graphene frameworks.

Main Methods:

  • Pulsed plasma stimulation was used to dope graphite electrodes.
  • Electrodes were submerged in organochlorine solvents: dichloromethane (CH2Cl2), chloroform (CHCl3), and carbon tetrachloride (CCl4).
  • Kelvin probe force microscopy (KPFM) was employed to measure the work function.

Main Results:

  • Chlorine-doped graphene (Cl-G) exhibited semiconductor behavior.
  • Graphene doped with chloroform (GG@CHCl3) showed the lowest work function value.
  • Pulsed plasma treatment allowed for controlled halogen doping levels.

Conclusions:

  • This study presents a new route for tuning graphene's semiconductivity.
  • Pulsed plasma treatment offers a method to control halogen doping on graphene-based carbon frameworks.
  • The findings suggest potential for tailored graphene materials in electronic devices.