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. 2019 Nov 25;9(12):1681. doi: 10.3390/nano9121681

Figure 1.

Figure 1

SEM images of lignin carbon thin film (LCF) on the surface of copper foil: (a) LCF–Cu 20–40, (b) LCF–Cu 120–40, and (c) LCF–Cu 120–300.