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Related Experiment Video

Updated: May 24, 2026

Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
07:24

Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle

Published on: September 22, 2015

Quasi-molecular fluorescence from graphene oxide.

Charudatta Galande1, Aditya D Mohite, Anton V Naumov

  • 1Department of Mechanical Engineering and Materials Science, Rice University, Houston, TX 77005, USA.

Scientific Reports
|February 23, 2012
PubMed
Summary

Graphene oxide (GO) exhibits pH-dependent fluorescence due to quasi-molecular fluorophores. Its emission shifts from 500 nm in basic conditions to 680 nm in acidic conditions, revealing well-defined fluorophore structures.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Nanotechnology

Background:

  • Graphene oxide (GO) is a promising material with unique optical properties.
  • Understanding the origin of fluorescence in GO is crucial for its applications.

Purpose of the Study:

  • To investigate the pH-dependent fluorescence of graphene oxide.
  • To elucidate the structural origins of GO's visible fluorescence.

Main Methods:

  • Experimental characterization of GO aqueous dispersions.
  • Spectroscopic analysis (emission and excitation).
  • Model computations.

Main Results:

  • GO exhibits structured, pH-dependent visible fluorescence.

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  • Emission spectra shift from ~500 nm (basic) to ~680 nm (acidic).
  • Excitation spectra remain largely unchanged with pH, indicating excited-state protonation.

    • Conclusions:

    • GO fluorescence originates from quasi-molecular fluorophores involving carboxylic acid groups and graphene carbon atoms.
    • The emitting species are well-defined, similar to polycyclic aromatic compounds.
    • pH significantly influences GO fluorescence via protonation of excited states.