Figure 1.

Logarithmic selectivity coefficients of gold nanoporous membrane‐based Cu²⁺‐selective electrodes for Zn²⁺ and Mg²⁺ as a function of the resistance of the corresponding membranes determined by EIS in a symmetrical cell setup with the peptide‐modified nanoporous membrane separating two half cells filled with 10 mm KCl. The nanoporous membrane was modified by various composition ternary thiol solutions using HDT to provide hydrophobicity. The inset shows the best selectivities over Mg²⁺ obtained with alkanethiols of various chain lengths (C3, C8, C12, C16).