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Updated: May 26, 2026

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Yung-Chang Lin1, Chun-Chieh Lu, Chao-Huei Yeh

  • 1Department of Electrical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.

Nano Letters
|December 14, 2011
PubMed
Summary

Poly(methyl methacrylate) (PMMA) residue on graphene is difficult to remove completely by annealing. This process can alter graphene's electronic properties and introduce defects, impacting its performance in advanced applications.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Polymer residues, such as poly(methyl methacrylate) (PMMA), pose challenges for graphene research and applications.
  • Effective cleaning of PMMA residue is crucial for accurate property assessment and device fabrication.

Purpose of the Study:

  • To systematically investigate the decomposition of PMMA on graphene during annealing.
  • To understand the impact of PMMA residue and annealing on graphene's intrinsic properties.

Main Methods:

  • Transmission electron microscopy (TEM) for visualizing PMMA decomposition.
  • Raman spectroscopy for analyzing graphene's structural and electronic changes.
  • Density functional theory (DFT) calculations for mechanistic insights.

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Main Results:

  • PMMA decomposition occurs in two stages during annealing and is not fully removable below graphene degradation temperatures.
  • Annealing induces a blue-shift in graphene's 2D Raman mode, indicating band structure modulation and defect introduction.
  • DFT calculations suggest localized sp(2) to sp(3) carbon rehybridization at defect sites.

Conclusions:

  • Annealing PMMA residue on graphene leads to incomplete removal and introduces defects, altering graphene's electronic band structure.
  • The observed Raman shifts are attributed to PMMA decomposition byproducts and subsequent carbon rehybridization on graphene.
  • Understanding these effects is vital for optimizing graphene processing and applications in electronics and biotechnology.