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The SEM images of the bare SPCE (a) and SPGE with different deposition time: 100 s (b), 300 s (c). The scale bar was 20 μm. Inserts: Clearer SEM images of SPCE and SPGE. The scale bar was 200 nm. PAGE analysis of the formation of the TDF: (d) TDF-26, (e) TDF-17 and (f) TDF-7.
