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Silvestri A, Mondini S, Marelli M, et al. Synthesis of Water Dispersible and Catalytically Active Gold-Decorated Cobalt Ferrite Nanoparticles. Langmuir. 2016;32(28):7117-26doi: 10.1021/acs.langmuir.6b01266.
Silvestri, A., Mondini, S., Marelli, M., Pifferi, V., Falciola, L., Ponti, A., Ferretti, A. M., & Polito, L. (2016). Synthesis of Water Dispersible and Catalytically Active Gold-Decorated Cobalt Ferrite Nanoparticles. Langmuir : the ACS journal of surfaces and colloids, 32(28), 7117-26. https://doi.org/10.1021/acs.langmuir.6b01266
Silvestri, Alessandro, et al. "Synthesis of Water Dispersible and Catalytically Active Gold-Decorated Cobalt Ferrite Nanoparticles." Langmuir : the ACS journal of surfaces and colloids vol. 32,28 (2016): 7117-26. doi: https://doi.org/10.1021/acs.langmuir.6b01266
Silvestri A, Mondini S, Marelli M, Pifferi V, Falciola L, Ponti A, Ferretti AM, Polito L. Synthesis of Water Dispersible and Catalytically Active Gold-Decorated Cobalt Ferrite Nanoparticles. Langmuir. 2016 Jul 19;32(28):7117-26. doi: 10.1021/acs.langmuir.6b01266. Epub 2016 Jul 01. PMID: 27328722.
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Langmuir. 2016 Jul 19;32(28):7117-26. doi: 10.1021/acs.langmuir.6b01266. Epub 2016 Jul 01.

Synthesis of Water Dispersible and Catalytically Active Gold-Decorated Cobalt Ferrite Nanoparticles.

Langmuir : the ACS journal of surfaces and colloids

Alessandro Silvestri, Sara Mondini, Marcello Marelli, Valentina Pifferi, Luigi Falciola, Alessandro Ponti, Anna Maria Ferretti, Laura Polito

Affiliations

  1. Laboratorio di Nanotecnologie, Istituto di Scienze e Tecnologie Molecolari, Consiglio Nazionale delle Ricerche , Via G. Fantoli 16/15, 20138 Milan, Italy.
  2. Dipartimento di Chimica, Università degli Studi di Milano , Via C. Golgi 19, 20133 Milan, Italy.

PMID: 27328722 DOI: 10.1021/acs.langmuir.6b01266

Abstract

Hetero-nanoparticles represent an important family of composite nanomaterials that in the past years are attracting ever-growing interest. Here, we report a new strategy for the synthesis of water dispersible cobalt ferrite nanoparticles (CoxFe3-xO4 NPs) decorated with ultrasmall (2-3 nm) gold nanoparticles (Au NPs). The synthetic procedure is based on the use of 2,3-meso-dimercaptosuccinic acid (DMSA), which plays a double role. First, it transfers cobalt ferrite NPs from the organic phase to aqueous media. Second, the DMSA reductive power promotes the in situ nucleation of gold NPs in proximity of the magnetic NP surface. Following this procedure, we achieved a water dispersible nanosystem (CoxFe3-xO4-DMSA-Au NPs) which combines the cobalt ferrite magnetic properties with the catalytic features of ultrasmall Au NPs. We showed that CoxFe3-xO4-DMSA-Au NPs act as an efficient nanocatalyst to reduce 4-nitrophenol to 4-aminophenol and that they can be magnetically recovered and recycled. It is noteworthy that such nanosystem is more catalytically active than Au NPs with equal size. Finally, a complete structural and chemical characterization of the hetero-NPs is provided.

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