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http://dx.doi.org/10.7471/ikeee.2017.21.3.288

Enhancing photoluminescence of Au - TiO2 nanoparticles using Drude model  

Dang, Diem Thi-Xuan (Faculty of Physics and Engineering Physics, University of Science, Vietnam National University Ho Chi Minh City)
Vu, Thi Hanh Thu (Faculty of Physics and Engineering Physics, University of Science, Vietnam National University Ho Chi Minh City)
Publication Information
Journal of IKEEE / v.21, no.3, 2017 , pp. 288-296 More about this Journal
Abstract
The enhancement of photoluminescence of Au-$TiO_2$ nanoparticles by surface plasmon resonance has been studied extensively by experiment in recent years. For the purpose of optimizing the photoluminescence property of Au-$TiO_2$ nanoparticles, the manufacturing parameters related to the Au nanoparticles and $TiO_2$ nanoparticles need to be considered. In this paper, Drude model and Maier's effective volume method are used to analyze the variation of the metal nanoparticle radius, separation between metal nanoparticle and dielectric molecule, and total absorption cross-section with original radiative efficiency on the photoluminescence property of Au-$TiO_2$ nanoparticles. The results show that to obtain the optimized enhancement factor for photoluminescence process, the size of Au nanoparticle is about 13 - 20 nm, the separation between Au nanoparticle and $TiO_2$ molecule is about 5 -15 nm, the total absorption cross-section of $TiO_2$ molecules is about $1-100nm^2$ and the original radiative efficiency of $TiO_2$ molecule is weak about 0.001- 0.1. With these fabrication parameters, the photoluminescence property of Au-$TiO_2$ nanoparticles can be enhanced several thousand times compared to traditional $TiO_2$ nanoparticles.
Keywords
surface plasmon resonance; photoluminescence; Drude model; Maier effective volume method; Au-$TiO_2$;
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