Synthesis of co-organosilane-Au nanocomposites via a controlled interphasic reduction

Isaac Ojea-Jiménez, Julia Lorenzo, José M. Rebled, Judith Sendra, Jordi Arbiol, Victor Puntes

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)


Au-coated magnetic-core nanocomposites with diameters of ∼100 nm were synthesized by the biphasic reduction of Au 3+ onto the surface of organosilane-stabilized Co nanoparticles of ∼12 nm in diameter via an iterative gold reduction. The shell consists initially of Au seeds of ∼3 nm in diameter, which can be later grown to form partially fused ∼6 nm Au NPs. A detailed investigation by transmission electron microscopy, scanning electron microscopy, UV-vis, dynamic light scattering, ζ-potential, X-ray diffraction, inductively coupled plasma mass spectrometry, and superconducting quantum interference device magnetometry was performed in order to elucidate the morphology and properties of these nanocomposites. These novel nanoarchitectures, which could be transferred into aqueous phase by means of an amphiphilic polymer, showed low cytotoxicity on human HepG2 cells and presented relaxivity in MRI contrast enhancement experiments. © 2012 American Chemical Society.
Original languageEnglish
Pages (from-to)4019-4027
JournalChemistry of Materials
Publication statusPublished - 13 Nov 2012


  • biphasic reduction
  • cobalt nanoparticles
  • contrast enhancement
  • gold coating
  • hybrid nanocomposites
  • phase-transfer

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