Usually the as grown graphene film is transfered by PMMA, which act as a sacrifice layer. But I found the PMMA residues were very hard to clean thoroughly. Does anyone have another effective method to transfer graphene clean and effective?
The process I remove PMMA is as follows:
(1) heating the PMMA/graphene layer for 30 mins at 180℃ to strenthen the adhesion between graphene and SiO2.
(2)soaking into acetone for 6 hours at 60 ℃
(3)soaking into ethanol for 1 hour
(4)blowing with N2 to dry the surface
after dry the surface under N2 gas, you could anneal the sample in forming gas for several hours, then the PMMA residues gong.
after 4th step, anneal the sample in ar or h2/n2 ambient at 350C for 4 to 6 hrs, PMMA debris are almost removed
Electrochemical technique, can be used but it is tedious.
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