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A Concentric Ring Electrode for a Wall‐jet Cell in a Microfluidic Device
Author(s) -
Nishiyama Keine,
Hoshikawa Koki,
Maeki Masatoshi,
Ishida Akihiko,
Tani Hirofumi,
Tokeshi Manabu
Publication year - 2019
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201900109
Subject(s) - electrode , electrode array , materials science , ring (chemistry) , microfluidics , nanotechnology , electrochemistry , current density , optoelectronics , analytical chemistry (journal) , chemistry , physics , organic chemistry , chromatography , quantum mechanics
A concentric ring array electrode that amplifies the current signal without redox cycling has been developed for highly sensitive electrochemical detection at a single potential in a microfluidic platform. Herein, the effect of ring‐electrode width on the current and current density was examined. A ring‐array electrode with widths that decrease from the inner to the outer ring was shown to exhibit the highest sensitivity. This electrode delivered a current density that was approximately 50 % higher than that of a conventionally used disc electrode. We used numerical simulations to further optimize this type of array electrode, which led to a limit of detection for catechol of 6.2 nmol/L. This ring array electrode has great potential for use in a variety of applications because it can be used to detect irreversible targets with a simple apparatus at a single potential and requires no electrode modification to achieve high sensitivity.