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Ascorbic acid-mediated synthesis and characterisation of iron oxide/gold core–shell nanoparticles.

Authors :
Sood, Ankur
Arora, Varun
Shah, Jyoti
Kotnala, R.K.
Jain, Tapan K.
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