Cited 34 time in webofscience Cited 33 time in scopus

A novel approach for the synthesis of ultrathin silica-coated iron oxide nanocubes decorated with silver nanodots (Fe3O4/SiO2/Ag) and their superior catalytic reduction of 4-nitroaniline

Title
A novel approach for the synthesis of ultrathin silica-coated iron oxide nanocubes decorated with silver nanodots (Fe3O4/SiO2/Ag) and their superior catalytic reduction of 4-nitroaniline
Authors
Abbas, MohamedTorati, Sri RamuluKim, CheolGi
DGIST Authors
Kim, CheolGi
Issue Date
2015
Citation
Nanoscale, 7(28), 12192-12204
Type
Article
Article Type
Article
Keywords
4-PhenylenediamineBetter PerformanceCatalystsCatalytic EfficienciesCatalytic ReductionCore-Shell StructureCrystal StructureEnergy Dispersive SpectroscopyHigh Resolution Transmission Electron MicroscopyInverse Spinel StructuresNanoparticlesReaction MechanismSilicaSilverSynthesis (Chemical)Transmission Electron MicroscopyX-Ray Diffraction DataX Ray Diffraction
ISSN
2040-3364
Abstract
A novel sonochemical approach was developed for the synthesis of different core/shell structures of Fe3O4/SiO2/Ag nanocubes and SiO2/Ag nanospheres. The total reaction time of the three sonochemical steps for the synthesis of Fe3O4/SiO2/Ag nanocubes is shorter than that of the previously reported methods. A proposed reaction mechanism for the sonochemical functionalization of the silica and the silver on the surface of magnetic nanocubes was discussed in detail. Transmission electron microscopy revealed that the surface of Fe3O4/SiO2 nanocubes was decorated with small Ag nanoparticles of approximately 10-20 nm in size, and the energy dispersive spectroscopy mapping analysis confirmed the morphology of the structure. Additionally, X-ray diffraction data were used to confirm the formation of both phases of a cubic inverse spinel structure for Fe3O4 and bcc structures for Ag in the core/shell structure of the Fe3O4/SiO2/Ag nanocubes. The as-synthesized Fe3O4/SiO2/Ag nanocubes showed a high efficiency in the catalytic reduction reaction of 4-nitroaniline to 4-phenylenediamine and a better performance than both Ag and SiO2/Ag nanoparticles. The grafted silver catalyst was recycled and reused at least fifteen times without a significant loss of catalytic efficiency. © The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/5224
DOI
10.1039/c5nr02680f
Publisher
Royal Society of Chemistry
Related Researcher
  • Author Kim, Cheol Gi Lab for NanoBio-MatErials & SpinTronics(nBEST)
  • Research Interests Magnetic Materials and Spintronics; Converging Technology of Nanomaterials and Biomaterials; Bio-NEMS;MEMS
Files:
There are no files associated with this item.
Collection:
Department of Emerging Materials ScienceLab for NanoBio-Materials & SpinTronics(nBEST)1. Journal Articles


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