I notice that upon washing and air-drying of my RGO/SPCE surface and characterizing again via DPV, the current response towards ferricyanide probe significantly decreases. My worry is that the significant sensitivity increase effected to my modified electrode is lost as I proceed with my subsequent modification steps, e.g., MIP functionalization.
Any recommendations on how to improve the stability of my RGO film layer? I do one-step electrochemical deposition at acidic pH and then subsequent polymerization on its surface at near-neutral pH and finally wash this deposited film with acetic acid/SDS combination.
Thank you very much in advance for your helpful inputs.
There are several attempts to make this method of measurement work for you One of them, after washing the surface of the RGO / SPCE, do not dry it with air, but dry it by passing nitrogen gas on the surface of the electrode.
The problem is also the amount of your RGO film layer, the concentrations may be incorrect and thus may block and poison the electrode.
Dear Sir Mohammed I. Majeed
Do u suggest then to use N2-drying every subsequent modification step or just for the RGO layer?
Noted on the concentration effect, so far I have alternately used concentrations of 1 mg/mL and 0.5 mM (2 mg/mL), respectively, and yes I intermittently am faced with "poisoned" electrode surfaces for both.
Thank you.
Hi Corpuz,
This decrease in current response might has arisen owing to air-dried process, you need to use nitrogen purging for this purpose. Air-drying may trigger the formation of some oxides which decrease sensitivity. The fouling may also be there.
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