I have synthesized Graphene by hummer method and want to use it for electrochemical sensing. Can I directly drop cast it on electrode (Glassy Carbon)? Since graphene has no functional group. Will it deposit properly ?
Hi Puja,
Which solvent you have used to disperse graphene?
What is the final pH of your sensing medium?
If it is ok, you can use graphene composites like chitosan-Graphene, PANI-Graphene, Nafion-Graphene, etc. which are stable enough for long term sensing applications...
Dont go for surfactants as they surely decrease the conductivity and in turn sensitivity of your platform.
If want to use graphene alone you should refer the factors that effect the graphene stability. as if your graphene is hydrophylic, you cannot use it alone in aqueos sensing media like PBS.
The best is you can electrochemically reduce the Graphene oxide on GC to get more stable Graphene (Reduced graphene oxide) Platform.
Cheers...
As mentioned by Khosro and Chiranjeevi, the solvent matters in dispersion of GO or rGO. For references, you can go through the following article,
Dispersion behaviour of graphene oxide and reduced graphene oxide.
Journal of Colloid and Interface Science. 2014, 430,108–112
doi:10.1016/j.jcis.2014.05.033
Thank you all for reply.
I am having graphene procured from ACS Nano. Its not dispersible in water and I want to deposit it on GCE for sensing work. I tried to activate its functional groups by acid treatment and redispersed it in water. Can I use it now to modify GCE electrode?
Yes, You can, But acid treatment decreases the conductivity of the graphene in turn sensitivity of your sensor (please remember that).
Simple drop casting will never give us stable sensing platform as it is onlythe physisorption of the material used. but you can use this drop casting technique for disposable sensing platforms.
There are numerous graphenes, such as covalently functionalized, non covalently functionalized, doped, composites with Conductive polymers, Ionic liquids, nanoparticles etc. hence be clear in choosing the right graphene for your application.
For any further help you can mail me @ [email protected]
Cheers...
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