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Issue 118, 2015
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Multifunctional core–shell Co–SiO2 nanowires via electrodeposition and sol–gel techniques

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Abstract

In this work, we propose a new strategy for the synthesis of multifunctional nanowires using a combination of sol–gel and electrodeposition techniques, based on a two-step procedure. First of all, nanotubes of SiO2 are synthesized via a sol–gel technique using polycarbonate membranes as templates. Homogenous nanotubes are obtained after centrifugation and thermal annealing. Afterwards, a ferromagnetic cobalt core is grown using potentiostatic electrodeposition. Finally, the core–shell Co–SiO2 nanowires are released by dissolving the template using wet-etching. These nanodevices can be used for many detection and sensing purposes. As a proof of concept, we have developed a pH nanosensor by including a pH-sensitive organic dye in the SiO2 shell. The sensing principle is based on the optical response of the organic dye towards pH when added to a solution. The magnetic core allows the recovery of the nanosensors after use. These nanowires can therefore be used as recoverable pH nanosensors. By changing the dye molecule to another molecule or receptor, the procedure described in the paper can be used to synthesize nanodevices for many different applications.

Graphical abstract: Multifunctional core–shell Co–SiO2 nanowires via electrodeposition and sol–gel techniques

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Article information


Submitted
15 Jul 2015
Accepted
30 Oct 2015
First published
30 Oct 2015

RSC Adv., 2015,5, 97503-97507
Article type
Paper

Multifunctional core–shell Co–SiO2 nanowires via electrodeposition and sol–gel techniques

L. Martín-García, S. Ruiz-Gómez, M. Abuín, Y. Montaña, N. Carmona and L. Pérez, RSC Adv., 2015, 5, 97503
DOI: 10.1039/C5RA13905H

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