VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013

 QNplage

 Nanophysics: from fundamentals to applications

(the return)

 

Thursday 8
Nano-materials

› 14:20 - 14:40 (20min)
The abnormal photoluminescence of TiO2 nanocrystals
Hong Le Van  1@  
1 : Institute of Materials Science, Vietnamese Academy of Science and Technology  (IMS, VAST)  -  Website
18 Hoang Quoc Viet, Cau- Giay, Hanoi -  Vietnam

In this report we present a new photoluminescence result of the TiO2 nanocrystal particles and nanotube arrays. The 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 TiO2 nanocrystals with small size of 5-8 nm no emitted when excited by a laser beam with a wavelength of 325 nm, in contrary it emitted when excited by laser beam with a wavelength of 442 nm. In principle the TiO2 nanotube arrays exhibit a similar emission behavior. The nanotube arrays weakly emitted when excited by a laser beam of 325 nm, but more strongly emitted when excited by a laser beam of 442 nm. A two-step exciting model was proposed to explain the abnormal photoluminescence spectra and nature of the energy transfer in TiO2 nanocrystal material. It was found that the model well clarify the recorded result. The obtained abnormal photoluminescence result is an experimental evidence to suggest that the TiO2 nanoparticles and nanotube arrays are applicable for photocatalysis


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