Right after I attached ZnO in GPE surface, I tried the electrode to detect formaldehyde in aqueous solution with varied the supporting electrolyte (H2SO4 0.1 M, KCl 0.1 M, KOH 0.1 M, and some pH buffer), but the signal still not significant. Is this any pre treatment for the electrode so the signal can enhance significantly?

Thank you for your time

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