A novel recyclable magnetic nanostructure for highly sensitive, selective and reversible detection of zinc ions in aqueous solutions

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• 作者：Ghazaleh PourfallahAuthor Vitae ; Xia Lou ; ^{x.lou@curtin.edu.au" class="auth_mail" title="E-mail the corresponding author} ; ^{lizilou7854@gmail.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Nanosensor ; Magnetic chemosensor ; Zinc ion detection ; Reversible ; Recoverable
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：5 October 2016
• 年：2016
• 卷：233
• 期：Complete
• 页码：379-387
• 全文大小：3125 K

文摘

The synthesis and characterisation of a novel dansylated magnetic nanostructure, namely Fe₃O₄@SiO₂-PEG-DnS, is reported here. Investigations of its fluorescent properties showed that the presence of the PEG moiety significantly enhanced the fluorescent intensity of the nanostructure when compared to both the free dansyl fluorophore and a nanostructure that contained no PEG spacer between the core and the attached dansyl group. The addition of zinc (Zn²⁺) ions to the aqueous suspension of Fe₃O₄@SiO₂-PEG-DnS led to a 12.5-fold decrease in intensity. The quenching was selective to only Zn²⁺. No interference was observed by other examined metal cations, including cadmium (Cd²⁺). A very low detection limit of 6.00 nM in relation to zinc ions was demonstrated. In addition, the newly developed magnetic nanostructured chemosensor was found to be highly stable, reusable and recoverable.