Electrochemical detection of reduced graphene oxide nanoparticles in aqueous solution

Harim Kwon, Ji Hyeon Jeong, Byung Kwon Kim, Jun Hui Park

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We have demonstrated electrochemical detection of reduced graphene oxide (rGO) nanoparticles on an ultramicroelectrode (UME) in aqueous solution using rGO collision events. The collision phenomena are detected by monitoring a current–time transient. To attract the rGO to the UME surface, a positive electric field was developed near the UME using a redox reaction. As model systems, ferrocenemethanol and ferrocyanide oxidation reactions were adopted. Amperometric current measurements showed a staircase current response after attachment of rGO on the UME surface. The magnitude of the staircase current is given by the stepwise increase in current, which can provide insight into the size distribution of the rGO colliding with the UME. In the presence of higher concentrations of rGO, multiple collision events happened sequentially on the UME. In this case, an increasing current trend, rather than a single staircase current, was observed. The overall current increment for a given time is a measure of the concentration of rGO in solution. By using this method, charged conductive materials in an aqueous solution can be sensitively detected and/or accumulated.

Original languageEnglish
Pages (from-to)3753-3760
Number of pages8
JournalResearch on Chemical Intermediates
Issue number6
StatePublished - 1 Jun 2018

Bibliographical note

Funding Information:
Acknowledgements This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2016R1D1A1B03931670 and NRF-2015R1C1A1A01055250) and the Research Fund of Chonbuk National University in 2013.

Publisher Copyright:
© 2018, Springer Science+Business Media B.V., part of Springer Nature.


  • Electrochemistry
  • Migration
  • Particle collision
  • Reduced graphene oxide
  • Single-particle detection


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