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Issue 3, 2016
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A simple route to diverse noble metal-decorated iron oxide nanoparticles for catalysis

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Abstract

Developing facile synthetic routes to multifunctional nanoparticles combining the magnetic properties of iron oxides with the optical and catalytic utility of noble metal particles remains an important goal in realizing the potential of hybrid nanomaterials. To this end, we have developed a single route to noble metal-decorated magnetic nanoparticles (Fe3O4@SiO2–M; M = Au, Pd, Ag, and PtAg) and characterized them by HRTEM and STEM/EDX imaging to reveal their nanometer size (16 nm Fe3O4 and 1–5 nm M seeds) and uniformity. This represents one of the few examples of genuine multifunctional particles on the nanoscale. We show that these hybrid structures have excellent catalytic activity for the reduction of 4-nitrophenol (knorm = 2 × 107 s−1 mol(Pd)−1; 5 × 106 s−1 mol(Au)−1; 5 × 105 s−1 mol(PtAg)−1; 7 × 105 s−1 mol(Ag)−1). These rates are the highest reported for nano-sized comparables, and are competitive with mesoparticles of similar composition. Due to their magnetic response, the particles are also suitable for magnetic recovery and maintain >99% conversion for at least four cycles. Using this synthetic route, Fe3O4@SiO2–M particles show great promise for further development as a precursor to complicated anisotropic materials or for applications ranging from nanocatalysis to biomedical sensing.

Graphical abstract: A simple route to diverse noble metal-decorated iron oxide nanoparticles for catalysis

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Publication details

The article was received on 28 Sep 2015, accepted on 14 Dec 2015 and first published on 15 Dec 2015


Article type: Paper
DOI: 10.1039/C5NR06700F
Author version available: Download Author version (PDF)
Citation: Nanoscale, 2016,8, 1535-1544
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    A simple route to diverse noble metal-decorated iron oxide nanoparticles for catalysis

    J. M. Walker and J. M. Zaleski, Nanoscale, 2016, 8, 1535
    DOI: 10.1039/C5NR06700F

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