Hollow gold-silver nanoshells coated with ultrathin sio2 shells for plasmon-enhanced photocatalytic applications

Pannaree Srinoi, Maria D. Marquez, Tai Chou Lee, T. Randall Lee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

This article details the preparation of hollow gold-silver nanoshells (GS-NSs) coated with tunably thin silica shells for use in plasmon-enhanced photocatalytic applications. Hollow GS-NSs were synthesized via the galvanic replacement of silver nanoparticles. The localized surface plasmon resonance (LSPR) peaks of the GS-NSs were tuned over the range of visible light to near-infrared (NIR) wavelengths by adjusting the ratio of silver nanoparticles to gold salt solution to obtain three distinct types of GS-NSs with LSPR peaks centered near 500, 700, and 900 nm. Varying concentrations of (3-aminopropyl)trimethoxysilane and sodium silicate solution afforded silica shell coatings of controllable thicknesses on the GS-NS cores. For each type of GS-NS, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images verified our ability to grow thin silica shells having three different thicknesses of silica shell (~2, ~10, and ~15 nm) on the GS-NS cores. Additionally, energy-dispersive X-ray (EDX) spectra confirmed the successful coating of the GS-NSs with SiO2 shells having controlled thicknesses. Extinction spectra of the as-prepared nanoparticles indicated that the silica shell has a minimal effect on the LSPR peak of the gold-silver nanoshells.

Original languageEnglish
Article number4967
Pages (from-to)1-11
Number of pages11
JournalMaterials
Volume13
Issue number21
DOIs
StatePublished - Nov 2020

Keywords

  • Core-shell nanoparticles
  • Gold-silver nanoshells
  • Metal nanoparticles
  • Nanoparticles
  • Silica shells

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