Carbazole‐based conjugated polymer covalently coated Fe3O4 nanoparticle as efficient and reversible Hg2+ optical probe. Issue 17 (3rd June 2013)

• Record Type: Journal Article
• Authors: Tian, Yong; Shi, Wei; Luo, Jianmin; Ma, Fudong; Mi, Hongyu; Lei, Yanli
• Is Part Of: Journal of polymer science. Volume 51:Issue 17(2013:Sep.)
• Page Start: 3636
• Page End: 3645
• Publication Date: 2013-06-03
• Subjects: 547
• DOI: 10.1002/pola.26759
• Languages: English
• ISSNs: 0887-624X

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>A type of fluorescent–magnetic dual‐function nanocomposite, Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@P‐2, was successfully obtained by Cu<sup>+</sup>‐catalyzed click reaction between acetylene (CCH)‐substituted carbazole‐based conjugated polymer (<bold>P‐2)</bold> and azide‐terminated silica‐coated magnetic iron oxide nanoparticles (Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>–N<sub>3</sub>). Optical and magnetization analyses indicate that Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@P‐2 exhibits stable fluorescence and rapid magnetic response. The fluorescence of Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@P‐2 was quenched significantly in the presence of <italic>I</italic><sup>−</sup> and gave a detection limit (DL) of ∼8.85 × 10<sup>−7</sup> M. Given the high binding constant and matching ratio between Hg<sup>2+</sup> and <italic>I</italic><sup>−</sup>, the fluorescence of Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@P‐2/<italic>I</italic><sup>−</sup> complex recovered efficiently with the addition of Hg<sup>2+</sup>. A DL of ∼4.17 × 10<sup>−7</sup> M was obtained by this probing system. Recycling of Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@P‐2 probe was readily achieved by simple magnetic separation. Results indicate that Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@P‐2 can be used as an "on–off–on" fluorescent switchable and recyclable Hg<sup>2+</sup> probe. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 3636–3645</p> </abstract>