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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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Raman Spectral Band Oscillations in Large Graphene Bubbles.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Graphene exhibits unique electronic and thermal properties.
  • Graphene bubbles, formed by mechanical stress, offer a platform to study material properties.
  • Raman spectroscopy is a powerful tool for characterizing graphene's properties.

Purpose of the Study:

  • Investigate size-dependent optical phenomena in graphene bubbles.
  • Analyze laser-induced heating effects and temperature distribution.
  • Determine thermal conductivity and chemical reactivity of graphene using bubble structures.

Main Methods:

  • Fabrication and characterization of large graphene bubbles.
  • Acquisition and analysis of Raman spectra at varying laser power.
  • Calculation of temperature distribution within graphene bubbles based on Raman data.

Main Results:

  • Observed size-dependent oscillations in Raman spectral intensity and frequency attributed to optical standing waves.
  • Quantified local heating effects and temperature gradients within graphene bubbles.
  • Demonstrated reduced laser heating towards the bubble edge.
  • Assessed graphene's thermal conductivity and chemical reactivity.

Conclusions:

  • Graphene bubbles serve as a model system for studying optical and thermal properties.
  • Raman spectroscopy effectively probes temperature distribution and laser-induced effects.
  • Graphene bubbles show enhanced reactivity towards hydrogen plasma compared to flat graphene.