Plasmonic Au nanoparticles on 8 nm TiO2 nanotubes for enhanced photocatalytic water splitting

Hyunsu Kim, Chulmin Choi, Jirapon Khamwannah, Sun Young Noh, Yanyan Zhang, Tae Yeon Seong, Sungho Jin

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We report here for the first time a successful distribution and attachment of fine Au nanoparticles on ∼8 nm diameter TiO2 nanotubes having significantly increased surface area. Au thin film deposition onto hydrothermally grown TiO2 nanotube arrays followed by thermal annealing breaks up the Au film into desired, uniformly distributed nanoparticles. Visible light absorption spectra of the gold nanoparticles on TiO2 nanotubes indicate that the Au nanoparticles are photo-excited due to plasmon resonance, and charge separation is accomplished by the transfer of photoexcited electrons from the gold particle to the TiO2 conduction band, thereby enhancing photoelectrochemical performance. By virtue of substantially increased surface area with the 8 nm TiO2 nanotube substrate in combination with the plasmonic effect of distributed Au nanoparticles, significantly increased photocurrent density was obtained with extended light absorbance from the UV regime to the visible spectrum region. Such gold nanoparticle decorated, fine TiO2 nanostructures fabricated by a simple and versatile method can be useful for hydrogen generation by water splitting, CO oxidation and various other types of photocatalysts and photovoltaic fuel cells.

Original languageEnglish
Article number053104
JournalJournal of Renewable and Sustainable Energy
Volume5
Issue number5
DOIs
Publication statusPublished - 2013 Sep 1

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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