please anyone help me to clean Glassy carbon electrode
modified with AuNPs .
how to remove AuNPs from Glassy carbon electrode surface
and also from sides of electrode
You know that gold dissolves in mixtures of nitric and sulfuric acids, an aqueous solution of potassium cyanide. But how will they act on the linker and coupling agent not out of the ordinary. To find out, you need to do an experiment.
We use polishing with alumina powder for glassy carbon electrode which removes the linkers which can be gold NPs also, present onto GC electrode surface.
I would cycle up and down electrochemically in hydrochloric acid. The gold oxidation potential is somewhere around 200mV vs Ag/AgCl. Try not to go too high or you will oxidise the carbon.
Only a small amount of gold will be oxidised on each cycle, but changing to chloride and back will cause the particles to break up. I suggest going into hydrogen reduction each cycle, but only a little.
The acids used to dissolve gold is HCl and HNO3 mixed. This may also oxidise your carbon.
thank u sir for your valuable suggestion
and what about piranha solution
is it used for cleaning purpose
Piranha is very aggressive and will take the thiols off your gold. It might be enough, but it should not dissolve the gold. I suggested chloride, because it forms a complex with the gold. It might work, gold sulfate apparently exists, which would be enough.
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