In situ growth of hollow gold-silver nanoshells within porous silica offers tunable plasmonic extinctions and enhanced colloidal stability

Chien Hung Li, Andrew C. Jamison, Supparesk Rittikulsittichai, Tai Chou Lee, T. Randall Lee

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Porous silica-coated hollow gold-silver nanoshells were successfully synthesized utilizing a procedure where the porous silica shell was produced prior to the transformation of the metallic core, providing enhanced control over the structure/composition of the bimetallic hollow core. By varying the reaction time and the precise amount of gold salt solution added to a porous silica-coated silver-core template solution, composite nanoparticles were tailored to reveal a readily tunable surface plasmon resonance that could be centered across the visible and near-IR spectral regions (∼445-800 nm). Characterization by X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, scanning electron microscopy, and transmission electron microscopy revealed that the synthetic methodology afforded particles having uniform composition, size, and shape. The optical properties were evaluated by absorption/extinction spectroscopy. The stability of colloidal solutions of our composite nanoparticles as a function of pH was also investigated, revealing that the nanoshells remain intact over a wide range of conditions (i.e., pH 2-10). The facile tunability, enhanced stability, and relatively small diameter of these composite particles (∼110 nm) makes them promising candidates for use in tumor ablation or as photothermal drug-delivery agents.

Original languageEnglish
Pages (from-to)19943-19950
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number22
DOIs
StatePublished - 26 Nov 2014

Keywords

  • Bimetallic
  • Gold - Silver
  • Hollow nanoshells
  • Silica-coated
  • Tunable plasmon

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