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Effect of surface modification of 1-undecanethiol (R-CH3), 11-mercaptopundecanoic acid (R-COOH), and 11-mercapto-1-undecanol (R-OH) ligands on (a) the UV-Vis spectra and (b) plot of extinction maximum band position of SiO2@Au nanostructures synthesized at 150 M Au3+.
