Abstract
The efficiency of UV photocatalysis on TiO2 particles was increased by mixing TiO2 particles with nanoporous gold (NPG) with pore diameters of 10–40 nm. This means that NPG acts as a promoter in the photocatalytic reaction of TiO2. Broadband spectroscopic results from millimeter wave to ultra violet of NPG membrane are discussed to estimate plasmonic effect on the catalysis.
Highlights
It is well known that bulk Au is inert
We have found that nanoporous gold (NPG) acts as a promoter to produce OH radicals using TiO2 5
Reflectivity spectra of the NPG films on quartz plate were measured over four regions: (1) millimeter wave region was measured using a coherent transition radiation induced by the LINAC facility of Research Reactor Institute, Kyoto University; (2) far-infrared region was measured using synchrotron radiation by UVSOR facility of Institute for Molecular Science
Summary
Au nanoparticles with several-nanometer-scale sizes are catalytically active for several chemical reactions such as the decomposition of formaldehyde and oxidation of CO1,2. The catalytic activity depends on the size of nanoparticles. Nanoporous Au (NPG) with 10–50 nm pore size shows catalytic activity for oxidation[2]. It has been reported that composite materials of TiO2 with Au or Pt nanoparticles enhance TiO2 catalytic activity[4]. It is supposed that the plasmonic electromagnetic effect of Au or Pt enhances the catalytic activity of TiO2. Since pores of NPG are able to trap the TiO2 particles on its surface, NPG seems to be a photocatalytic nanocomposite because of enhancement of the catalytic activity by the electromagnetic effect. We report optical properties of NPG in this paper to investigate electromagnetic and plasmonic origin of the promotor effect
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