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Materials 2014, 7(1), 195-205; doi:10.3390/ma7010195
Article

Preparation of Fe3O4-Embedded Poly(styrene)/Poly(thiophene) Core/Shell Nanoparticles and Their Hydrogel Patterns for Sensor Applications

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2,*  and 1,*
1 Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemoon-Gu, Seoul 120-749, Korea 2 Department of Applied Chemistry, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 702-701, Korea
* Authors to whom correspondence should be addressed.
Received: 30 November 2013 / Revised: 26 December 2013 / Accepted: 27 December 2013 / Published: 2 January 2014
(This article belongs to the Special Issue Nanocomposites of Polymers and Inorganic Particles 2013)
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Abstract

This research describes the preparation and sensor applications of multifunctional monodisperse, Fe3O4 nanoparticles-embedded poly(styrene)/poly(thiophene) (Fe3O4-PSt/PTh), core/shell nanoparticles. Monodisperse Fe3O4-PSt/PTh nanoparticles were prepared by free-radical combination (mini-emulsion/emulsion) polymerization for Fe3O4-PSt core and oxidative seeded emulsion polymerization for PTh shell in the presence of FeCl3/H2O2 as a redox catalyst, respectively. For applicability of Fe3O4-PSt/PTh as sensors, Fe3O4-PSt/PTh-immobilized poly(ethylene glycol) (PEG)-based hydrogels were fabricated by photolithography. The hydrogel patterns showed a good sensing performance under different H2O2 concentrations. They also showed a quenching sensitivity of 1 µg/mL for the Pd2+ metal ion within 1 min. The hydrogel micropatterns not only provide a fast water uptake property but also suggest the feasibility of both H2O2 and Pd2+ detection.
Keywords: polythiophene; nanoparticles; fluorescence; sensor; hydrogel patterns polythiophene; nanoparticles; fluorescence; sensor; hydrogel patterns
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Kim, Y.S.; Lee, H.J.; Govindaiah, P.; Son, W.; Koh, W.-G.; Cheong, I.W.; Kim, J.H. Preparation of Fe3O4-Embedded Poly(styrene)/Poly(thiophene) Core/Shell Nanoparticles and Their Hydrogel Patterns for Sensor Applications. Materials 2014, 7, 195-205.

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