Abnormal Photoluminescence of TiO2 nanocrystals (nanoparticles and nanotube arrays)

Ly Ngoc Tai, Dao Thi Hoa, Le Van Hong
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Authors

  • Ly Ngoc Tai Institute of Materials Science, Vietnam Academy of Science and Technology
  • Dao Thi Hoa Institute of Materials Science, Vietnam Academy of Science and Technology
  • Le Van Hong Institute of Materials Science, Vietnam Academy of Science and Technology

DOI:

https://doi.org/10.15625/0868-3166/24/3/5086

Abstract

In this paper we report new abnormal photoluminescence results of TiO2 nanocrystal particles and nanotube arrays. Photoluminescence spectra were recorded for TiO2 nanocrystal particles and nanotube arrays that were synthesized by a wet chemical route and the electrochemical anodization, respectively. It was found that the TiO2 nanocrystal with small size of 5-8 nm no emitted when excited by a laser beam of 325 nm, in contrary it emitted when excited by laser beam of 442 nm. The TiO2 nanotube arrays exhibit a similar emission behavior. The nanotube arrays weakly emitted when excited by a laser beam of 325 nm and more strongly emitted when excited by a laser beam of 442 nm. The obtained results have been explained by a two-step exciting model and supposed to be related with the size effect of nanocrystal and it is an experimental evidence to believe that the TiO2 nanoparticles and nanotube arrays are applicable for photo-catalysis under sun light.

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Published

16-10-2014

How to Cite

[1]
L. N. Tai, D. T. Hoa, and L. V. Hong, “Abnormal Photoluminescence of TiO2 nanocrystals (nanoparticles and nanotube arrays)”, Comm. Phys., vol. 24, no. 3, p. 275, Oct. 2014.

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Papers
Published 16-10-2014

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