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Schematic illustration for detection of A) Ag+ (Reproduced with permission.53 Copyright 2017, Springer‐Verlag), B) Ca2+ (Reproduced with permission.55 Copyright 2015, American Chemical Society), C) Fe3+ (Reproduced with permission.56 Copyright 2016, American Chemical Society), and D) Zn2+ (Reproduced with permission.57 Copyright 2015, American Chemical Society).
