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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

351
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
351

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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
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Defect Engineering in Laser-Induced Graphene (LIG) Through Temperature Control: A Reactive Molecular Dynamics Study.

Sergey V Pavlov1

  • 1Joint Institute for High Temperatures of the Russian Academy of Sciences, Moscow 125412, Russia.

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|November 27, 2025
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Summary

Optimizing laser-induced graphene (LIG) synthesis requires careful temperature control. Simulations reveal an ideal 3000 K window for high graphene yield, while lower temperatures enhance functional groups for advanced applications.

Keywords:
ReaxFFdefect engineeringlaser-induced graphenemolecular dynamics

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Area of Science:

  • Materials Science
  • Computational Chemistry

Background:

  • Scalable and cost-effective graphene synthesis is crucial for energy storage and sensing.
  • Laser-induced graphene (LIG) offers a one-step method for fabricating porous graphene from polymers.

Purpose of the Study:

  • To investigate the temperature dependence of polyimide carbonization into LIG using reactive molecular dynamics simulations.
  • To analyze the structural evolution and functional group formation during LIG synthesis.

Main Methods:

  • Reactive molecular dynamics simulations employing the ReaxFF force field.
  • Analysis of carbonization product structures and functional group concentrations at varying temperatures.
  • Simulations extended to approximately 5 nanoseconds to ensure equilibrium.

Main Results:

  • An optimal carbonization temperature window near 3000 K was identified for maximizing graphene yield.
  • Temperatures above 3500 K led to structural degradation, evidenced by reduced six-membered carbon rings.
  • Lower temperatures (2500-2750 K) decreased graphene yield but increased concentrations of carbonyl, pyrrolic, pyridinic, and nitrile functional groups.

Conclusions:

  • The study highlights the critical role of temperature in controlling LIG yield and functionalization.
  • Tailoring functional groups through controlled carbonization temperatures can enhance graphene for electrochemical and sensing applications.
  • Adequate simulation timescales are essential for accurately modeling the graphitization process.