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Ascorbic acid-mediated synthesis and characterisation of iron oxide/gold core–shell nanoparticles.
- Source :
-
Journal of Experimental Nanoscience . Mar2016, Vol. 11 Issue 5, p370-382. 13p. - Publication Year :
- 2016
-
Abstract
- The current article reports on providing surface modification of magnetic nanoparticles with gold to provide stability against aggregation. Gold-coated magnetite nanoparticles were synthesised to combine both magnetic as well as surface plasma resonance (SPR) properties in a single moiety. The nanocomposites were produced by reduction (using ascorbic acid) of gold chloride on to the surface of iron oxide nanoparticles. Ascorbic acid not only acts as a reducing agent, but also the oxidised form of ascorbic acid i.e. Dehydro-ascorbic acid acts as a capping agent to impart stability to as synthesised gold-coated iron oxide nanocomposites. The synthesised nanocomposite was monodispersed with a mean particle size of around 16 nm and polydispersity index of 0.190. X-ray diffraction analysis confirms presence of gold on the surface of magnetite nanoparticles. The synthesised nanocomposites had a total organic content of around 3.2% w/w and also showed a shifted SPR peak at 546 nm as compared to gold nanoparticles (528 nm). Both uncoated and gold-coated magnetite exhibited superparamagnetic behaviour at room temperature. Upon coating with gold shell, saturation magnetisation of iron oxide nanoparticles decreases from 42.806 to 3.54 emu/gram. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 17458080
- Volume :
- 11
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Journal of Experimental Nanoscience
- Publication Type :
- Academic Journal
- Accession number :
- 112130970
- Full Text :
- https://doi.org/10.1080/17458080.2015.1066514