Hi,
I am currently conducting experiments in making an electrochemical amperometric sensor. I bought a three-electrode flexible substrate from a retailer (all three electrodes are made of gold and the working electrode and counter electrode are interdigitated. The base material is made of polymer).
I would like to modify the working electrode of the substrate with a Prussian-blue layer. The PB-plating solution that I use is 2.5mM FeCl3, 2.5mm K3Fe(CN)6, 0.1M KCl and 0.1M HCl (as used by many research papers), with commerically available Pt counter electrode and Ag/AgCl electrode (see Figure_1).
My Problem is: I've tried both Chronamperometry and Cyclic Voltammetry with the settings suggested by different research papers, but I cannot successfully modify the layer on the electrode area. It seems that there is no effect happening at all (see Figure_2, the PB on the substrate after the test can be easily wash away with water or vanish from natural air-dry environment), prior to putting the same substrate into another electrolyte for post-treatment. Anyone who has experience in EC sensor can suggest what type of possible problems would be?
Thank you.
The problems of electrodeposition on flexible substrates are very difficult because the nucleation of metal atoms or metal oxides on this type of substrate is not well fixed. I believe that we should try to use heavy substrates to make thin films by electrodeposition.
I agree with Mr Zoubir Jallal in what he said about electrodeposition on a flexible sample. It is noticeable from the picture that you also have a problem in the position of the sample where it must be between the reference electrode and the current electrode. It is also better to deposited on a solid sample, due to easy nucleation on solid substrates surfaces.
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