Why can't we peel off CVD grown Graphene from metallic substrates?

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How to explain the IV data of photodetectors attached?

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Artavazd Kirakosyan

can you specify you question? did you etch the metal ? or do you want to peel of from metal mechanically?

Chandan Biswas

Too strong interaction between Graphene and metallic substrate. Interlayer interaction in HOPG (sp2 -sp2 interaction between the layers) is very low, that's why we can exfoliate them apart rather easily.