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(a) PEN (poly(ethylene naphthalate)), (b) PVDF, (c) PI, (d) PE, (e) platinum, (f) silver. Dashed lines indicate the surface of substrates. For d, a very thin film of PE extends along the glass plate beyond the dashed line (whitish horizontal line), but it does not affect the nucleation behaviour. The scale bars correspond to 10 μm.
