| Title |
Development of Sodium and Potassium Ion-Selective Electrodes Based on Laser Induced Graphene |
| Authors |
최재성(Jaesung Choi) ; 한지훈(Ji-hoon Han) ; 김태헌(Taeheon Kim) ; 박정호(James Jungho Pak) |
| DOI |
https://doi.org/10.5370/KIEE.2019.68.7.860 |
| Keywords |
PI film ; Laser Induced Graphene ; Sodium ; Potassium ; ion-selective electrode ; PEDOT: PSS |
| Abstract |
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. |