γ-ray synthesis of composite nanoparticles of noble metals and magnetic iron oxides

Functionalization of magnetic gold/iron-oxide composite nanoparticles with oligonucleotides and magnetic separation of specific target

“…The gold/iron-oxide composite nanoparticles were synthesized by gamma-ray or ultrasonic irradiation [11,12]. In the former, the iron-oxide nanoparticles ðNanoTek s Þ of g-Fe 2 O 3 or Fe 3 O 4 with an average diameter of 26 or 100 nm, respectively, were dispersed at concentration of 0.1 g/l in an aqueous solution containing 0.5 mM HAuCl 4 Á 4H 2 O, 125 mM 2-propanol and 0.45 mM polyvinyl alcohol (PVA).…”

“…Recently, we have developed two original techniques for immobilizing gold nanograins onto the surface of magnetic iron-oxide nanoparticles using gamma-rays or ultrasonics [10][11][12]. Our composite nanoparticles exhibit a reddish color due to the surface plasmon of gold.…”

Gold Nanostructures Prepared on Solid Surface

“…Besides interesting properties of nanostructured gold systems such as catalytic effects or magnetism [2,10], which both originate from surface and quantum size effects, they are also extremely usable those, which are closely connected with the average number of atoms in the nanoparticles. The properties and behavior of extremely small gold particles completely differ from those of bulk materials, e.g., their melting point [2,11,12], density [13], lattice parameter [13][14][15], and electrical or optical properties [13,14,16] are dramatically changed.…”

Electrochemical Detection of H2O2 Based on Fe3O4 Nanoparticles with Graphene Oxide and Polyamidoamine Dendrimer

“…In particular, magnetic Fe 3 O 4 nanoparticles have low toxicity, and good biocompatibility in physiological environment, which have become a most-studied material and been applied in many respects [11]. Such as environment or food analysis [12], separation of biomolecules [13], and immunoassays [14]. Moreover, graphene-based nanomaterials are better for arising electrochemical sensing performance, which possess unique physicochemical properties, such as surface area, high electrical conductivity, good flexibility and high chemical stability [15].…”