What are the different methods used to clean Screen Printed Electrodes (SPE)?

Different techniques are used to clean SPE, depending on SPE surface type and level of contamination. The cleaning may be further divided into three types:

1. Chemical cleaning methods (using solvents).
   • Piranha solution (owing to strong aggression, not preferred).
   • Aqua regia
2. Thermal cleaning method:
   • UV ozone cleaning
3. Electrochemical cleaning methods (using cyclic voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS) technique)
   • KOH sweep method.
   • Potential cycling using H₂SO₄ or HCl.
   • CV sweeping using potassium ferricyanide.
   • Taking negative sweeping potential (using CV technique).