Surface charge tuning of functionalized silica cross-linked micellar nanoparticles encapsulating a donor–acceptor dye for Fe(iii) sensing. Issue 5 (10th December 2014)

• Record Type: Journal Article
• Authors: Gai, Fangyuan; Zhou, Tianlei; Liu, Yunling; Huo, Qisheng
• Is Part Of: Journal of materials chemistry. Volume 3:Issue 5(2015)
• Page Start: 2120
• Page End: 2127
• Publication Date: 2014-12-10
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c4ta05555a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : This work demonstrates that a series of electron transfer-based fluorescent chemosensors have been designed by using surface negatively charged silica cross-linked micellar nanoparticles as scaffolds to encapsulate FTA for improving the quantitative Fe 3+ sensing ability in aqueous media. Abstract : In this study, a water-soluble Fe 3+ 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 Fe 3+ sensing was confirmed using the fluorescence titration method. FTA-encapsulated functionalized SCMNPs (FTA-NH2 -SCMNPs and FTA-SO3 H-SCMNPs) were synthesized to demonstrate the surface charge effect of nanoparticles on Fe 3+ fluorescence sensing. The sensing ability of Fe 3+ followed in this order: FTA-SO3 H-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 Fe 3+ was in accordance with the Stern–Volmer equation in FTA-SCMNPs and FTA-SO3 H-SCMNPs. FTA-SO3 H-SCMNPs showed good selectivity for Fe 3+ detection. Because of the charge effect of functionalized SCMNPs on a dye-doped Fe 3+ sensing system, these kinds of nanoparticles offered possibilities to construct sensing ability-enhanced fluorescence-quenching sensors by tuning the surface charge.