Issue 5, 2015

Surface charge tuning of functionalized silica cross-linked micellar nanoparticles encapsulating a donor–acceptor dye for Fe(iii) sensing

Abstract

In this study, a water-soluble Fe3+ ratiometric fluorescent sensor was designed and synthesized by encapsulating a donor–acceptor (D–A) dye 4-formacyl-triphenylamine (FTA) into silica cross-linked micellar nanoparticles (SCMNPs). The quenching of FTA-encapsulated SCMNPs (FTA-SCMNPs) on Fe3+ sensing was confirmed using the fluorescence titration method. FTA-encapsulated functionalized SCMNPs (FTA-NH2-SCMNPs and FTA-SO3H-SCMNPs) were synthesized to demonstrate the surface charge effect of nanoparticles on Fe3+ fluorescence sensing. The sensing ability of Fe3+ followed in this order: FTA-SO3H-SCMNPs > FTA-SCMNPs > FTA-NH2-SCMNPs, which indicates that particles with stronger negative charge have better sensing abilities. Moreover, linear correlation between the quenching intensity and lower concentration of Fe3+ was in accordance with the Stern–Volmer equation in FTA-SCMNPs and FTA-SO3H-SCMNPs. FTA-SO3H-SCMNPs showed good selectivity for Fe3+ detection. Because of the charge effect of functionalized SCMNPs on a dye-doped Fe3+ sensing system, these kinds of nanoparticles offered possibilities to construct sensing ability-enhanced fluorescence-quenching sensors by tuning the surface charge.

Graphical abstract: Surface charge tuning of functionalized silica cross-linked micellar nanoparticles encapsulating a donor–acceptor dye for Fe(iii) sensing

Supplementary files

Article information

Article type
Paper
Submitted
17 Oct 2014
Accepted
28 Nov 2014
First published
28 Nov 2014

J. Mater. Chem. A, 2015,3, 2120-2127

Author version available

Surface charge tuning of functionalized silica cross-linked micellar nanoparticles encapsulating a donor–acceptor dye for Fe(III) sensing

F. Gai, T. Zhou, Y. Liu and Q. Huo, J. Mater. Chem. A, 2015, 3, 2120 DOI: 10.1039/C4TA05555A

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