Journal
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
Volume 62, Issue 10, Pages 1376-1381Publisher
KOREAN PHYSICAL SOC
DOI: 10.3938/jkps.62.1376
Keywords
Chemical synthesis method; Fabrication of magnetic crystalline nanostructures; Absorbance spectra UV-Vis; XRD; HRTEM; Magnetometry
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Funding
- Basque Government (Actimat Consortium) [ETORTEK 05/01]
- MCI of Spain [MAT2005-07554-C02-01, NAN2004-09195-C04-01, MAT2010-20442]
- Xunta de Galicia [GruposRef.Comp.2010/41]
- European Community [FP7 - 21468]
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Magnetic particles covered by gold are very important in many biological applications. However, there are not simple methods to produce small (< 5-10 nm) nanoparticles. One of the main reasons for that is the general use of iron oxides as magnetic cores, which have a large crystalline mismatch with gold. The use of Fe would be more appropriate, but its high tendency to oxidation has largely precluded it from being used as a core. Here, we will show that using a simple one-pot successive reaction method in microemulsions, can avoid such problems and is able to produce very stable core-shell Fe@Au nanoparticles. With this procedure, nanoparticles of similar to 6 nm with a Fe core of 3 nm can easily be obtained. These Fe@Au nanoparticles, with a saturation magnetization of 1.13 emu/g, are very stable even in air after magnetic separation from the solution, which shows the good covering of the Fe core by the Au shell. In this contribution we will report the key parameters, which have to be taken into account, to prepare such stable Fe@Au dispersions and analyze their optical and magnetic properties, as well as their possible applications as biosensors, targeted magnetic separation, etc.
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