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Confeito-like Au/TiO2 nanocomposite: synthesis and plasmon-induced photocatalysis

  • Nasim Kamely
  • Masaki Ujihara
Research Paper

Abstract

Nanocomposites of confeito-like Au nanoparticles (CAuNPs) and TiO2 were synthesized under different irradiation conditions (darkness, UV light, and visible light) and time spans by the reaction of a Ti-citrate-peroxo complex with CAuNPs. The TiO2 synthesized under irradiation formed mesoporous films with embedded CAuNPs. The photocatalytic activity of the CAuNP/TiO2 nanocomposites was measured by the degradation of methylene blue (MB) under different irradiation conditions (darkness, UV light, and visible light). The results demonstrated that the bare CAuNPs decomposed MB under visible light and that this activity was enhanced by hybridization with TiO2. The activity of the CAuNPs was associated with the plasmon-induced effect, which the TiO2 enhanced by suppressing electron-hole recombination via acceptance of the hot electrons from the CAuNPs. This synergistic effect of the CAuNP/TiO2 nanocomposite varied with the amount of TiO2, and a thick layer of TiO2 decreased the activity as the surface of the CAuNPs was covered by TiO2. This behavior indicates that to design effective plasmonic devices and catalysts, an optimum balance between the amounts of CAuNPs and TiO2 must be achieved.

Keywords

Gold nanoparticle Titanium dioxide Citrate-peroxo complex Localized surface plasmon Photocatalyst 

Abbreviations

AuNP

Au nanoparticle

CAuNP

Confeito-like Au nanoparticle

Cit

Citric acid

HRTEM

High-resolution transmission electron microscopy

MB

Methylene blue

SEM

Scanning electron microscopy

TEM

Transmission electron microscopy

UV-vis-NIR

Ultraviolet-visible-near infrared

Notes

Funding

This study was funded by the Ministry of Science and Technology, Taiwan (106-2221-E-011-164-).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11051_2018_4276_MOESM1_ESM.docx (11 mb)
ESM 1 (DOCX 11252 kb)

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Graduate Institute of Applied Science and TechnologyNational Taiwan University of Science and TechnologyTaipeiRepublic of China

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