Diffusion kinetics of gold in TiO2 nanotube arrays for formation of Au@TiO2 nanotube arrays

Wanggang Zhang, Yiming Liu, Diaoyu Zhou, Jing Wen, Liuwei Zheng, Wei Liang, Fuqian Yang

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A simple approach is presented to form Au@TiO2 nanotube arrays. This approach consists of the formation of pure TiO2 nanotube arrays by a two-step anodization process, the coating of a Au nanofilm on the top of the pure TiO2 nanotube arrays, and the heat treatment of the TiO2 nanotube arrays coated with the Au nanofilm. The heat treatment leads to the diffusion of Au atoms into the TiO2 nanotube arrays, resulting in the formation of Au nanocrystals on the outer surface of the TiO2 nanotubes. X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy are used to characterize the microstructural evolution of the Au@TiO2 nanotube arrays, which reveals the phase change of TiO2 from amorphous phase to anatase phase. The kinetics of the migration of Au atoms into the TiO2 nanotube arrays is studied. The diffusivity for the diffusion of Au atoms on the outer surface of the TiO2 nanotubes is in the range of 4.14-19.4 × 10-18 m2 s-1 for temperature in the range of 400-500 °C. The activation energy for the migration/diffusion of Au on the outer surface of the TiO2 nanotubes in the temperature range of 400 to 500 °C is 67.2 kJ mol-1. The growth of Au nanocrystals on the surface of the TiO2 nanotubes can be described as a first order reaction.

Original languageEnglish
Pages (from-to)48580-48588
Number of pages9
JournalRSC Advances
Volume6
Issue number54
DOIs
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© 2016 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering

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