I have prepared ZnO nanoparticles and I want to perform the cyclic voltammetry for sensing hydrazine with ZnO nanoparticles(nps). But since I have not grown ZnO nps on the electrode and I'm planning to deposit it on GE electrodes(as working). Can you guys please suggest on how would I carry this procedure, I have tried depositing nps directly and then keeping it overnight for it to dry and form a film. But after 3-4 cycles on CV the nps starts dissolving in the PBS solution (supporting electrolyte), I dint use nafion in this procedure.
Awaiting response guys,
Thanks in advance!
For your nanoparticles to have come off the substrate, there was either not a strong immobilization or if you are really talking about 'dissolving', then you may have scanned through potentials strong enough to say corrode the working electrode.
There are a number of papers on this subject (immobilization of nanoparticles and redox of hydrazine). A number of papers I have seen used nafion so it will be good to try it. I suggest you look at papers from Martin Pumera and maybe C. E. Banks. They may have worked with carbon materials but the concepts may apply.
In the link below, Pumera immobilized NiO nanoparticles on GCE for hydrazine redox.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3420180/
Nafion is an appropriate choice to immobilize the nanoparticles on the electrode. In addition also check the stability of your nanoparticles in the potential region by carrying out CV studies in the absence of hydrazine.