A Study Aimed at Understanding the Use of Nanomaterial-Treated Filters …
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Fig. 5 a Optical spectra for solutions containing L-cysteine-modified gold nanoparticles with
various zinc (II) ion concentrations; b calibration curve based on plasmon band maximum shifts,
from optical spectra; c aqueous solutions of gold nanoparticles functionalized with L-cysteine;
gradual color changes upon addition of zinc (II) ions are due to nanoparticle aggregation and
coupling of their surface plasmon band. (Color figure online)