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. 2016 Oct 19;16(10):1742. doi: 10.3390/s16101742

Figure 2.

Figure 2

Effect of heat treatment, at 130 °C for 1 h, on surface morphology of the different chemical etched Ag surfaces: (a) native flattened Ag wire washed in DI water under sonication; (b) 30 s NH4OH; (c) 10 s HNO3; (d) 2 m HNO3; (e) 30 s NH4OH followed by 10 s HNO3; and (f) 30 s NH4OH followed by 2 m HNO3.