Single Microcystis Detection Through Electrochemical Collision Events on Ultramicroelectrodes

Jeeho Lee, Jungeun Lee, Sua Song, Byung Kwon Kim

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


This study introduces the electrochemical detection of a single microcystis on an Au ultramicroelectrode based on single-entity electrochemistry. The electrochemical collisions occur when the microcystis is adsorbed on the electrode surface. This hinders the oxidation of the electroactive redox species in the solution, thus making the current decrease like a staircase. In this experiment, the current decrease caused by the collision which requires an appropriate concentration of the redox species and initial potential, providing information on migration effect by zeta-potential, and collision frequency. Comparison of the simulation results of the finite element method and the experimental results suggested that the staircase current decrease caused by the microcystis can occur due to collision not only on the electrode surface but also on the surrounding regions of the electrode surface (i.e., the active area). These results suggest various applications of the single-entity cell detection using the electrochemical method for real-time analysis.

Original languageEnglish
Pages (from-to)818-823
Number of pages6
JournalBulletin of the Korean Chemical Society
Issue number5
StatePublished - May 2021

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (no. 2011‐0030074 and NRF‐2018R1C1B6008668).

Publisher Copyright:
© 2021 Korean Chemical Society, Seoul & Wiley-VCH GmbH


  • Blue-green algae sensing
  • Electrochemical collision
  • Microcystis
  • Single-entity electrochemistry
  • Ultramicroelectrode


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