RETRACTED ARTICLE: Air-stable superparamagnetic metal nanoparticles entrapped in graphene oxide matrix

Jiří Tuček, Zdeněk Sofer, Daniel Bouša, Martin Pumera, Kateřina Holá, Aneta Malá, Kateřina Poláková, Markéta Havrdová, Klára Čépe, Ondřej Tomanec and Radek Zbořil ()
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Jiří Tuček: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Zdeněk Sofer: University of Chemistry and Technology Prague
Daniel Bouša: University of Chemistry and Technology Prague
Martin Pumera: School of Physical and Mathematical Sciences, Nanyang Technological University
Kateřina Holá: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Aneta Malá: Institute of Scientific Instruments, The Czech Academy of Sciences
Kateřina Poláková: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Markéta Havrdová: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Klára Čépe: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Ondřej Tomanec: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Radek Zbořil: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract Superparamagnetism is a phenomenon caused by quantum effects in magnetic nanomaterials. Zero-valent metals with diameters below 5 nm have been suggested as superior alternatives to superparamagnetic metal oxides, having greater superspin magnitudes and lower levels of magnetic disorder. However, synthesis of such nanometals has been hindered by their chemical instability. Here we present a method for preparing air-stable superparamagnetic iron nanoparticles trapped between thermally reduced graphene oxide nanosheets and exhibiting ring-like or core-shell morphologies depending on iron concentration. Importantly, these hybrids show superparamagnetism at room temperature and retain it even at 5 K. The corrected saturation magnetization of 185 Am2 kg–1 is among the highest values reported for iron-based superparamagnets. The synthetic concept is generalized exploiting functional groups of graphene oxide to stabilize and entrap cobalt, nickel and gold nanoparticles, potentially opening doors for targeted delivery, magnetic separation and imaging applications.

Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12879

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DOI: 10.1038/ncomms12879

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