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(a) Scheme of Ag- or AuNPs coated by a mixed layer of calixarenes C1 and C2. (b) Normalized ratio of the IR absorbance at 1100 and 1600 cm–1 of AgNPs-C1/C2 (blue) and AuNPs-C1/C2 (red) as a function of the molar ratio of C1 (%) used during the synthesis. (c) Difference between the maximum of absorbance at pH 3 and 7 of AgNPs-C1/C2 (blue) and AuNPs-C1/C2 (red) as a function of the molar ratio of C1 (%) used during the synthesis.
