Dosi Dosev et al 2007 Nanotechnology 18 055102 doi:10.1088/0957-4484/18/5/055102
Dosi Dosev1, Mikaela Nichkova2, Randy K Dumas3, Shirley J Gee2, Bruce D Hammock2, Kai Liu3 and Ian M Kennedy1
Show affiliationsMany types of fluorescent nanoparticles have been investigated as alternatives to conventional organic dyes in biochemistry; magnetic beads also have a long history of biological applications. In this work we apply flame spray pyrolysis in order to engineer a novel type of nanoparticle that has both luminescent and magnetic properties. The particles have magnetic cores of iron oxide doped with cobalt and neodymium and luminescent shells of europium-doped gadolinium oxide (Eu:Gd2O3). Measurements by vibrating sample magnetometry showed an overall paramagnetic response of these composite particles. Luminescence spectroscopy showed spectra typical of the Eu ion in a Gd2O3 host—a narrow emission peak centred near 615 nm. Our synthesis method offers a low-cost, high-rate synthesis route that enables a wide range of biological applications of magnetic/luminescent core/shell particles. Using these particles we demonstrate a novel immunoassay format with internal luminescent calibration for more precise measurements.
Issue 5 (7 February 2007)
Received 2 August 2006, in final form 14 November 2006
Published 9 January 2007
Dosi Dosev et al 2007 Nanotechnology 18 055102
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