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. 2019 Sep 18;19(18):4022. doi: 10.3390/s19184022

Figure 1.

Figure 1

Glycine–glycine–histidine (Gly–Gly–His, GGH) monolayer on a gold surface and the complexation of Cu2+ ions. Secondary amines, carrying different charges depending on the electrolyte’s pH, are indicated in red.