title: Magnetic/luminescent core/shell particles synthesized by spray pyrolysis and their application in immunoassays with internal standard.
abstract: Many 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:Gd(2)O(3)). 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 Gd(2)O(3) 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.
authors.affiliation: Department of Mechanical and Aeronautical Engineering, University of California Davis, One Shields Avenue, Davis, CA 95616, USA.
authors.forename: Dosi
authors.initials: D
authors.lastname: Dosev
authors.forename: Mikaela
authors.initials: M
authors.lastname: Nichkova
authors.forename: Randy K
authors.initials: RK
authors.lastname: Dumas
authors.forename: Shirley J
authors.initials: SJ
authors.lastname: Gee
authors.forename: Bruce D
authors.initials: BD
authors.lastname: Hammock
authors.forename: Kai
authors.initials: K
authors.lastname: Liu
authors.forename: Ian M
authors.initials: IM
authors.lastname: Kennedy