One-step deposition of Au nanoparticles onto chemically modified ceramic hollow spheres via self-assembly

S Begum, Ian Jones, DE Lynch, Jon Preece

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5 Citations (Scopus)


A concentrated citrate-stabilised Au nanoparticle (NP) colloid has been prepared using a modified Frens procedure, and characterised using transmission electron microscopy (TEM) and UV-Vis absorption spectroscopy. The average diameter determined from TEM images of concentrated Au NPs (16.57 +/- 0.65 nm) is similar to the diameter reported by Frens (16 nm). The surface plasmon band of the concentrated Au NPs UV-Vis spectrum has a lambda(max) at 522 nm. Bare silica ('Si') and iron-'Si' hollow microsphere surfaces have been functionalised with amino groups using the surfactant 3-aminopropyltrimethoxysilane (APTMS). The Au NPs have been assembled onto the APTMS-treated hollow spheres by dispersing a colloid of Au NPs into a suspension of hollow spheres at pH 4.5 (2 h). The volume ratio of Au NPs: hollow spheres was adjusted until maximum deposition could be achieved in a single step. TEM micrographs of ultrathin (80-100 nm) ultramicrotome sections through the Au NP-coated hollow spheres reveal that a single layer of Au NPs is mainly distributed on (1) the external side of the shell wall for 'Si' and (2) both sides of the shell wall for iron-'Si'. UV-Vis absorption spectra of the Au NP-coated hollow spheres show that the surface plasmon band shifts (524-613 nm) and broadens as the density of Au NPs is increased on the shell surface.
Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalJournal of Experimental Nanoscience
Issue number1
Publication statusPublished - 1 Jan 2012


  • silica and iron
  • 3-aminopropyltriethoxysilane (APTMS)
  • TEM of ultramicrotome sections
  • hollow spheres
  • concentrated gold nanoparticles


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