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Localized surface plasmon resonance for improving optical absorption in core-shell Ag@TiO₂ nanoparticles

Supachai Sompech^a,b, Pongsak Jittabut^c, Sukhontip Thaomola^d, Sasiporn Audtarat^a,b, Panadda Charee^a, Thananchai Dasri^a,b,*

 
ABSTRACT:     Titanium dioxide (TiO₂) has attracted extensive attention in environmental and biomedical applications, owing to its excellent chemical and photochemical stabilities, non-toxicity, and high degradation capacity. However, the wide band gap and low quantum yield of TiO₂ limit its practical applications, and it is possible to improve the optical efficiency and sensitivity of TiO₂ in the visible spectrum. In this work, theoretical calculations based on optical absorption in core-shell structured Ag@TiO₂ nanoparticles (NPs) combined with the surface plasmon resonance property of the core and photoactivity of the shell were investigated as a function of incident light wavelengths in visible spectrum. Shifting of wavelength, at which light was absorbed and enhanced optical absorption activity of TiO₂ NPs due to localized surface plasmon resonance excitation were clearly observed at a level greatly exceeding the value calculated for pure TiO₂ NPs. The calculated results suggest that both the interparticle distance and the diameter of Ag core in the core-shell structure of Ag@TiO₂ NPs influence the tuning and the enhancement of optical absorption spectra. These findings of enhanced optical absorption could be utilized as basic knowledge to design and synthesize Ag@TiO₂ NPs for future environmental and biomedicine applications.

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* Corresponding author, E-mail: thananchai@kku.ac.th

Received 6 Jun 2020, Accepted 25 Apr 2021