5 Scopus citations

Abstract

A crucial parameter in the body-fluid analysis is Na+-ions. Preferably realized as a small wearable, mostly the fabrication method, size, and costs prevented ion-selective devices to enter the big realm of IoT applications. This letter reports a printed, electrochemical sensor system for measuring Na+-ions in liquids. We designed, simulated, optimized, fabricated, and experimentally evaluated the sensor structures. Employing electrochemical impedance spectroscopy on a printable, dielectric ion-selective membrane, reproducible 2-electrode-measurement results are achieved in a biological-relevant mM-range. The cross-sensitivity toward K+-ions, dynamic range, and drift are investigated, and a robust measurement scheme is derived. The flexible, low-cost approach can enable new Internet-of-Things and point-of-care applications in biomedicine such as sweat analysis and environmental monitoring.

Original languageEnglish
Article number9387556
JournalIEEE Sensors Letters
Volume5
Issue number6
DOIs
StatePublished - Jun 2021

Keywords

  • Chemical and biological sensors
  • Internet-of-Things (IoT)
  • biosensors
  • biotech
  • dielectric impedance spectroscopy
  • electrochemical impedance spectroscopy (EIS)
  • flexible sensor
  • ion-selective membrane (ISM)
  • printed sensor

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