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Related Concept Videos

Fast Reactions01:27

Fast Reactions

9
Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
9

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Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies
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Sustainable Graphene Production: Flash Joule Heating Utilizing Pencil Graphite Precursors.

Mashhood Zahid1, Tomy Abuzairi1

  • 1Department of Electrical Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424, Indonesia.

Nanomaterials (Basel, Switzerland)
|August 9, 2024
PubMed
Summary

Common pencil leads can be transformed into graphene using Flash Joule Heating (FJH). The 14B grade showed the most promising results, indicating potential for sustainable graphene production.

Keywords:
flash Joule heatingflash graphene synthesispencil graphite precursorsscalable graphene production

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Graphene production from affordable sources is a key challenge.
  • Flash Joule Heating (FJH) offers a novel synthesis method.
  • Pencil leads present a readily available carbon precursor.

Purpose of the Study:

  • Investigate pencil leads as precursors for graphene synthesis via FJH.
  • Analyze the impact of pencil grade and applied voltage on graphene quality.
  • Explore sustainable and scalable graphene production methods.

Main Methods:

  • Flash Joule Heating (FJH) applied to 6H, 4B, and 14B pencil leads at varying voltages (0 V, 200 V, 400 V).
  • Characterization using Raman spectroscopy, electrical resistance measurements, and microscopy.
  • Analysis of structural changes, defect density, and crystallite size.

Main Results:

  • All pencil grades showed reduced electrical resistance after FJH.
  • Raman spectroscopy revealed significant changes in ID/IG and I2D/IG ratios.
  • The 14B grade at 400 V demonstrated reduced defects (ID/IG from 0.135 to 0.031) and increased crystallite size (143 nm to 612 nm).
  • Harder grades (6H, 4B) exhibited increased defect density at higher voltages.

Conclusions:

  • Pencil leads are viable precursors for graphene synthesis using FJH.
  • Pencil grade and applied voltage critically influence graphene quality.
  • The 14B grade shows potential for high-quality graphene production with possible in situ annealing effects.
  • This research advances sustainable and scalable graphene synthesis.