A performance improvement of enzyme-based electrochemical lactate sensor fabricated by electroplating novel PdCu mediator on a laser induced graphene electrode

Ji Hoon Han, Sang Hyun Park, Saeyoung Kim, James Jungho Pak

Research output: Contribution to journalArticlepeer-review

Abstract

A lactate sensor for lactate sensing using porous laser-induced graphene (LIG) electrodes with an electrodeposited PdCu catalyst was developed in this study. CO2 laser was used to convert the polyimide film surface to multilayered LIG. The morphology and composition of LIG were analyzed through field-emission scanning electron microscopy and Raman spectroscopy, respectively, to confirm that the fabricated LIG electrode was composed of porous and stacked graphene layers. PdCu was electrodeposited on the LIG electrode and lactate oxidase (LOx) was immobilized on the LIG surface to create a LOx/PdCu/LIG structure. According to the Randles–Ševčík equation, the calculated active surface area of the fabricated PdCu/LIG electrode was ∼12.8 mm2, which was larger than the apparent area of PdCu/LIG (1.766 mm2) by a factor of 7.25. The measured sensitivities of the fabricated lactate sensors with the LOx/PdCu/LIG electrode were −51.91 μA/mM·cm2 (0.1–5 mM) and −17.18 μA/mM·cm2 (5–30 mM). The calculated limit of detection was 0.28 μM. The selectivity of the fabricated lactate sensor is excellent toward various potentially interfering materials such as ascorbic acid, uric acid, lactose, sucrose, K+ and Na+.

Original languageEnglish
Article number108259
JournalBioelectrochemistry
Volume148
DOIs
Publication statusPublished - 2022 Dec

Keywords

  • Electrochemical sensor
  • Enzymatic sensor
  • Lactate sensor
  • PdCu
  • Porous laser-induced graphene
  • Ultra sensitivity

ASJC Scopus subject areas

  • Biophysics
  • Physical and Theoretical Chemistry
  • Electrochemistry

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