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(a) UV–vis–_NIR spectra of hydrosols of σCS@AgNPs (orange line) and σCS@NSs at different aging times: fresh (black line), 14 days (purple line), 75 days (green line), 1 year (blue line). (b) UV-vis–NIR spectra of hydrosols of HCS@AgNPs (orange line) and HCS@NSs at different aging times: 35 days (purple line), 60 days (green line), 1 year (brown line).
