Using water as the solute of graphene oxide, I want to use spin coating, (just like coating the photoresistor) on the substrate (ex: quartz).
I have previously used the Piranha Solution, but it was not always useful.
Could anybody suggest protocols?
I suggest
the follwing
1- suspend the graphen oxide in Ethanol
2- Subject the beaker with the suspension ultrasonic radiation for 10 mints
3- you will get a very good suspension of GO in Ethanol
4- quickelly spincoate the suspension on your substarte
5- You will get fairlly homogeniuos film of GO on substrate
Hey, my feeling is first to functionalize the substrate in order to enhance the adherence (electrostatic attraction)
GOD bless to HIM be the Glory!
Thank you guys, Actually, i had tried several solvent (ex: IPA, THF , ....) with high volatility, but
water is the best solution to disperse the GO,
Prof. Abdullah M. Asiri, i had tried Ethanol, in deed, i can obtain the good solvent of GO.
may i ask how high the degree C could let the solvent disappear,
can i just using the hot plate, or i have to use the oven. Thanks
Infact, ethanol is best choice as solute for GO. Heat treatment using hotplate is ok. Try to keep at 200 C about 12 hrs with stiring. Solvent will dissappear and you will get uniform coating of GO on the substrate.
Infact, I suspend the graphen oxide in water and spincoate the suspension on my substarte.
To the best of my knowledge, water is the better choice.
I tried ethanol and chloroform. Ethanol is better in my opinion.
I use to sonicate/ultrasonication for 30-60 min in bath sonicator which is mild one.
For spin-coating I pour ten or 15 drops on the substrat and let it stay for 10 or 15 sec (dwell time) then let it go for 60,90 and 120 sec at variable rpm. eg 60 sec at rpm 1000 and 60 sec at rpm 1500. I mean you can play with dwell time, rpm and spin time.
wish you good luck!
Ethanol has a low boiling point so I dont understand why we need high temp such as 200C to get rid of the solvent? Hope to hear back...
If I understood your question well, I would like to ask you, where you found this value? normally, you need 80-100 degrees for evaporating ethanol but if you are making film using spin or spray coating, then ethanol can be trapped between/among graphene sheets or flakes. This might require additional temperature treatment. But I can not tell you up to what temp one should go to completely remove ethanol from a film.
I have a fantastic solution for you, you can disperse the GO within the epoxy color and thence coat it on a surface via spray method. With this technique you can gain uniform coating on a surface. Moreover, for preparation of your suspension containing graphene, you can try vacuum shock technique:
http://www.sciencedirect.com/science/article/pii/S1359835X16302718
I don't have high experience especially on coating of graphene oxide (not yet), but I have some on graphene oxide and on coating separately. But I can suggest you that each type of coating technique needs a particular value of viscosity of the solution that I want to use. When you prepare the solution, try to understand the viscosity value that is related to spin coating. You can find information in literature, but I can suggest you to read something on spin coating wrote by Riccardo Balzarotti (in particular DOI: 10.1016/j.surfcoat.2017.09.077 ).
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