One-dimensional plasmonic nano-photocatalysts: Synthesis, characterization and photocatalytic activity

Simona Elisabeta Murph

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study describes a simple two-step approach to coat gold nanorods with a silica/titania shell. Gold nanorods with an aspect ratio of 2.5 (L=48±2 and d=19±1) are synthesized by a silver-seed mediated growth approach according to our previously reported procedure (Hunyadi Murph ACS Symposium Series, Volume 1064, Chapter 8, 2011, 127-163 and reference herein). Gold nanorods are grown on pre-formed gold nano-seeds in the presence of surfactant, cetyltrimethylammonium bromide (CTAB), and a small amount of silver ions. A bifunctional linker molecule which has a thiol group at one end and a silane group at the other is used to derivatize gold nanorods. The silane group is subsequently reacted with both sodium silicate and titanium isopropoxide to a silica/titania shell around the gold nanorods. By fine tuning the reaction conditions, the silica/titania shell thickness can be controlled from ∼5 to ∼40nm. The resulting nanomaterials are stable, amenable to scale up and can be isolated without core aggregation or decomposition. These new materials have been characterized by scanning electron microscopy, energy dispersive X-ray analysis, UV-Vis spectroscopy and dynamic light scattering analysis. Photocatalytic activity of Au-silica/titania nanomaterials under visible and UV illumination is measured via degradation of a model dye, methyl orange (MO) under visible and UV illumination. The results indicate a 3 fold improvement in the photocatalytic decomposition rate of MO under visible illumination vs. UV illumination.

Original languageEnglish (US)
Title of host publicationSolar Hydrogen and Nanotechnology VI
Volume8109
DOIs
StatePublished - Oct 11 2011
EventSolar Hydrogen and Nanotechnology VI - San Diego, CA, United States
Duration: Aug 23 2011Aug 25 2011

Other

OtherSolar Hydrogen and Nanotechnology VI
CountryUnited States
CitySan Diego, CA
Period8/23/118/25/11

Keywords

  • anisotropic nanophotocatalysts
  • core-shell
  • gold-titania
  • titania.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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