Synthesis of γ-Fe2O3@SiO2@polypyrrole core/shell/shell nanospheres with flexible controllability of electromagnetic properties

Yajie Zhang; Zhiming Zhang; Shicong Xu; Liangmin Yu; Yunze Long; Qunwei Tang

doi:10.1039/C5RA25576G

Synthesis of γ-Fe₂O₃@SiO₂@polypyrrole core/shell/shell nanospheres with flexible controllability of electromagnetic properties†

Yajie Zhang,^a Zhiming Zhang,*^a Shicong Xu,^b Liangmin Yu,*^a Yunze Long^b and Qunwei Tang^c

* Corresponding authors

^a Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
E-mail: zzmcyj@ouc.edu.cn, yuyan@ouc.edu.cn

^b College of Physics & Collaborative Innovation Center for Low-Dimensional Nanomaterials and Optoelectronic Devices, Qingdao University, Qingdao 266071, China

^c Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

Abstract

A new anchoring method by –SO₃H groups was proposed to prepare γ-Fe₂O₃@SiO₂@polypyrrole (γ-Fe₂O₃@SiO₂@PPy) nanospheres with core/shell/shell structure. In the reaction process involved, the sulfonic-functionalized γ-Fe₂O₃@SiO₂ (γ-Fe₂O₃@SiO₂–SO₃H) acts as the core for the polymerization of pyrrole. And PPy can be anchored to form on the surface of γ-Fe₂O₃@SiO₂ to form γ-Fe₂O₃@SiO₂@PPy nanospheres with the help of the sulfonic groups on the surface of γ-Fe₂O₃@SiO₂. Moreover, flexible controllability of the conductivity and saturation magnetization of the resulting γ-Fe₂O₃@SiO₂@PPy nanospheres can be realized through this method. The resulting electromagnetic γ-Fe₂O₃@SiO₂@PPy nanospheres show a maximum conductivity of 53 S cm⁻¹ and saturation magnetization of 8.17 A m² kg⁻¹. The method reported here may provide an efficient way to realize the best impedance matching between complex permeability and complex permittivity.

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Article information

DOI: https://doi.org/10.1039/C5RA25576G
Article type: Paper
Submitted: 01 Dec 2015
Accepted: 23 Dec 2015
First published: 23 Dec 2015

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RSC Adv., 2016,6, 6623-6630

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Synthesis of γ-Fe₂O₃@SiO₂@polypyrrole core/shell/shell nanospheres with flexible controllability of electromagnetic properties

Y. Zhang, Z. Zhang, S. Xu, L. Yu, Y. Long and Q. Tang, RSC Adv., 2016, 6, 6623 DOI: 10.1039/C5RA25576G

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