Abstract
Fluorescein hydrozide modified silica nanoparticles (FH-SNPs, 280–550 nm) were prepared by covalently immobilizing a fluorescein hydrozide (FH) derivative containing organosilyl ligands onto the surface of silica nanoparticles. FT-IR, elemental analysis , SEM microscopy and steady-state fluorescence anisotropy were used to characterize the functionalized FH-SNPs. Upon the addition of Cu(II), the spirolactam ring of FH moiety on the silica surface was opened and a fluorescent product was formed, exhibiting a selective Cu(II)-amplified fluorescence signal. Under the optimized conditions, the linear range of fluorescence intensity for Cu(II) is 5–80 μM ( R 2 = 0.992), and the limit detection for Cu(II) is 1.0 μM according to IUPAC definition ( C LOD = 3.3 S b / m ). ► Fluorescein hydrozide modified silica nanoparticles (FH-SNPs) were prepared. ► Upon the Cu(II) addition, FH-SNPs exhibited a selective Cu(II)-amplified fluorescence signal. ► FH-SNPs could be used as a reproducible solid sensor for Cu(II) detection in environmental samples.
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