Development of sodium and potassium ion-selective electrodes based on laser induced graphene

Jaesung Choi, Ji Hoon Han, Taeheon Kim, James Jungho Pak

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This paper describes the development of sodium and potassium ion-selective electrodes (Na+ and K+ ISEs) based on laser-induced graphene (LIG), which can selectively detect sodium and potassium ions in body fluids. LIG was formed on commercial polyimide film using a computer-controlled CO2 infrared laser and was characterized by FE-SEM and Raman spectroscopy. The results show that the LIG was composed of three-dimensional randomly stacked porous graphene layers. To minimize the potential drift of the ISEs, PEDOT:PSS was electrically polymerized on LIG working electrodes using potentiometry method and EIS spectrum confirmed that the LIG/PEDOT:PSS electrode has lower charge transfer resistance than pure LIG electrode. Na+ and K+ ISEs were made by drop casting the ion-selective membrane cocktail over the PEDOT:PSS layer. The fabricated Na+ and K+ ISEs show high sensitivity (63.08 mV/dec, 63.80 mV/dec), low detection limit (10-5.0 M), wide linear range (10-5 M to 10-1 M), and excellent selectivity of Na+ and K+ against NH4+, Mg2+ and Ca2+. Combined with the advantages of a one-step processing of LIG, we expect this work to promote future applications in micro devices for commercial applications.

Original languageEnglish
Pages (from-to)860-865
Number of pages6
JournalTransactions of the Korean Institute of Electrical Engineers
Issue number7
Publication statusPublished - 2019


  • Ion-selective electrode
  • Laser Induced Graphene
  • PI film
  • Potassium
  • Sodium

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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