Antimony- And Zinc-Doped Tin Oxide Shells Coated on Gold Nanoparticles and Gold-Silver Nanoshells Having Tunable Extinctions for Sensing and Photonic Applications

Riddhiman Medhi, Chien Hung Li, Sang Ho Lee, Pannaree Srinoi, Maria D. Marquez, Francisco Robles-Hernandez, Allan J. Jacobson, Tai Chou Lee, T. Randall Lee

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This paper reports the synthesis and study of doped metal oxides as the shell in core-shell nanoparticle architectures. Specifically, the paper describes the synthesis of gold nanoparticles (Au NPs) and gold-silver nanoshells (GS-NSs) coated with antimony- and zinc-doped tin oxide (SnO2) shells (i.e., Au@ATO, Au@ZTO, GS-NS@ATO, and GS-NS@ZTO) with a comparison to the undoped SnO2-coated analogues Au@SnO2 and GS-NS@SnO2. The doped tin oxide core-shell nanoparticles prepared here were thoroughly characterized using scanning electron microscopy, transmission electron microscopy, dynamic light scattering, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. Separately, their optical properties were evaluated by UV-vis and photoluminescence spectroscopy. The results demonstrate that noble-metal nanoparticles such as Au NPs and GS-NSs, which exhibit strong surface plasmon resonances at visible-to-near-IR wavelengths, can be activated across a broader region of the solar spectrum when used in conjunction with wide-band-gap semiconductors. In particular, utilization of a GS-NS core induces near-complete suppression in the electron-hole recombination processes in the tin oxide materials. Potential impacts on sensing and photonic applications are highlighted.

Original languageEnglish
Pages (from-to)8958-8971
Number of pages14
JournalACS Applied Nano Materials
Volume3
Issue number9
DOIs
StatePublished - 25 Sep 2020

Keywords

  • antimony-doped
  • core-shell nanoparticles
  • doped tin oxide shells
  • gold-silver nanoshells
  • localized surface plasmon resonance
  • zinc-doped

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