Issue 6, 2013

Fabrication of Ag-loaded multi-walled TiO2nanotube arrays and their photocatalytic activity

Abstract

TiO2 multi-walled nanotube arrays (MWNTAs) were synthesized by atomic layer deposition (ALD) using anodic aluminum oxide (AAO) as the template. TiO2 and Al2O3 layers were alternately deposited into the AAO pores by ALD. The tube thickness and the gap span were controlled by the ALD cycle numbers of TiO2 and Al2O3, respectively. A MWNT composed of two or three concentric tubes with different diameters was formed after removal of Al2O3. Silver nanoparticles were then deposited on both inner and outer surfaces of the tubes by photochemical reduction. Degradation of methylene blue was carried out to evaluate the photocatalytic activity of bare and silver-loaded TiO2 MWNTAs. It was found that the amount of TiO2, the reaction surface area, the crystalline phase, and silver modification were the factors to determine the photocatalytic activity. The triple-walled MWNTAs showed the best performance, and Ag loading further enhanced the activity.

Graphical abstract: Fabrication of Ag-loaded multi-walled TiO2 nanotube arrays and their photocatalytic activity

Article information

Article type
Paper
Submitted
23 Oct 2012
Accepted
26 Nov 2012
First published
27 Nov 2012

J. Mater. Chem. A, 2013,1, 1987-1991

Fabrication of Ag-loaded multi-walled TiO2 nanotube arrays and their photocatalytic activity

W. Chang, Y. Hsueh, S. Huang, K. Liu, C. Kei and T. Perng, J. Mater. Chem. A, 2013, 1, 1987 DOI: 10.1039/C2TA00806H

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