Potentiometric Ion-Selective Sensors based on UV-Ozone Irradiated Laser-Induced Graphene Electrode

Sudipta Choudhury, Soumyendu Roy, Gourav Bhattacharya, Sam Fishlock, Sujit Deshmukh, Sangita Bhowmick, James McLaughlin, Susanta Sinha Roy

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Disposable devices for sensing biomarkers like Na+ ion in sweat was developed using UV-Ozone irradiated laser-induced graphene (LIG) based electrodes. Solid-state ion-selective electrodes (ISEs) sensitive to Na+ ions were fabricated by a two-step drop-coating process of polyvinyl chloride solution containing plasticizer, ionophore and ion-exchanger on LIG electrode. Hydrophobic to hydrophilic transition induced by UV-Ozone treatment reduced the contact angle, resulting in better permeation of the ion-selective membrane into the ozonized LIG film. Raman spectroscopy and IR absorption studies indicate physisorption of ozone on LIG. Performance of ozonized LIG (O-LIG) electrodes was much better than pristine LIG and screen-printed carbon electrodes. Sensitivity of 60.2 ± 0.9 mV/ decade to Na+ ions and a lower limit of detection of 1 × 10−6 M was achieved using O-LIG based ISEs. Response time of the devices were around 1 min.
Original languageEnglish
Article number138341
JournalElectrochimica Acta
Early online date1 May 2021
Publication statusPublished (in print/issue) - 10 Aug 2021

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Publisher Copyright:
© 2021 Elsevier Ltd


  • Electrochemical analysis
  • Ion-selective membrane
  • Laser-induced graphene
  • Sweat sensor
  • Wearable electrode


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