Theoretical calculation of optical absorption property of Cu@Ag core–shell composite nanoparticle

Sompech, Supachai; Thaomola, Sukhontip; Chingsungnoen, Artit; Dasri, Thananchai

doi:10.1088/2053-1591/aaeb58

Cited by 17 publications

(8 citation statements)

References 29 publications

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“…The core-shell (A-B) structures-in particular, bimetallic particles [22][23][24][25][26][27]-are characterized by a shift in the plasmon resonance frequency as compared with that for monometallic particles. Owing to differences in the light scattering and absorption by atoms of different metals, the parameters of surface plasmon resonance depend on the sizes and materials of the core and the shell and can vary in a wider spectral interval.…”

Section: Introductionmentioning

confidence: 99%

Оптичні Характеристики Біметалевих Нанокуль

2021

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В роботi одержано формулу для часу релаксацiї електронiв на поверхнi i проаналiзовано частотну залежнiсть електричної i магнiтної компонент поляризовностi двошарової металевої нанокулi. Максимуми поляризовностi вiдповiдають плазмонним резонансам ядра та оболонки. Розрахунки було проведено для бiметалевих наночастинок Ag–Au, Au–Ag та Ag–Al, розташованих у тефлонi. Продемонстровано можливiсть керування оптичними характеристиками бiметалевих наночастинок змiною їх морфологiї. Проведено розрахунки перерiзiв екстинкцiї i розсiювання та фактора пiдсилення поля в околi наночастинок у широкому спектральному iнтервалi за рiзних спiввiдношень розмiрiв ядра та оболонки, а також оцiнено температуру бiметалевої нанокулi для фототермiчної терапiї злоякiсних пухлин.

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Section: Introductionmentioning

confidence: 99%

Оптичні Характеристики Біметалевих Нанокуль

2021

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“…Several techniques were proposed to make the photocatalyst reactive under visible light (λ>380 nm). Integration of TiO 2 with noble metals such as gold (Au) and silver (Ag), among others, has been shown an effective approach to improve its photocatalytic activity in terms of its localized surface plasmon resonance (LSPR) properties [10][11][12]. The LSPR effects can contribute to more effective light harvesting by expanding the optical absorption range from the UV to visible wavelengths of light.…”

Section: Introductionmentioning

confidence: 99%

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

Sompech¹,

Jittabut²,

Thaomola³

et al. 2021

ScienceAsia

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Titanium dioxide (TiO 2 ) 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 TiO 2 limit its practical applications, and it is possible to improve the optical efficiency and sensitivity of TiO 2 in the visible spectrum. In this work, theoretical calculations based on optical absorption in core-shell structured Ag@TiO 2 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 TiO 2 NPs due to localized surface plasmon resonance excitation were clearly observed at a level greatly exceeding the value calculated for pure TiO 2 NPs. The calculated results suggest that both the interparticle distance and the diameter of Ag core in the core-shell structure of Ag@TiO 2 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@TiO 2 NPs for future environmental and biomedicine applications.

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“…По сравнению с монометаллическими наночастицами биметаллические частицы более эффективны в регулировании плазмонного резонанса [17][18][19][20]. Состав биметаллических наночастиц можно изменять с целью управления свойствами плазмонов, поскольку для разных металлов они располагаются в разных областях спектра.…”

Section: Introductionunclassified

К Расчету Оптических Характеристик И Размерных Сдвигов Поверхностных Плазмонов Сферических Биметаллических Наночастиц

Коротун¹,

Погосов²

2021

Физика Твердого Тела

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Formulas are obtained for the effective relaxation time when the electron mean free path is less or comparable with the characteristic dimensions of the metallic regions. The frequency dispersion of the optical characteristics of spherical bimetallic particles near plasma resonances is calculated in the absence of quantum-size effects. Maintaining the style of the generally accepted description of monometallic particles based on the theories of Drude and Mie, the frequency dependence of the electric dipole polarizability of a two-layer metal nanosphere is analyzed. The appearance of two maxima of polarizability is a consequence of the difference between the metals of the core and the shell. The calculations were performed for Au @ Ag, Ag @ Au, Au @ Pt, Pt @ Au, and Pt @ Pd particles immersed in Teflon. The possibility of controlling the optical characteristics of bimetallic particles by changing their composition and volumetric content of metals has been demonstrated. The calculations of the absorption and scattering cross sections, as well as the optical radiation efficiency of particles in a wide spectral range, have been performed. The possible temperature of bimetallic particles upon absorption of an electromagnetic wave (for the purposes of photothermal therapy of malignant tumors) has been estimated. Key words: bimetallic nanoparticle, surface plasmon, polarizability, absorption cross section, scattering cross section, relaxation time.

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Theoretical calculation of optical absorption property of Cu@Ag core–shell composite nanoparticle

Cited by 17 publications

References 29 publications

Оптичні Характеристики Біметалевих Нанокуль

Оптичні Характеристики Біметалевих Нанокуль

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

К Расчету Оптических Характеристик И Размерных Сдвигов Поверхностных Плазмонов Сферических Биметаллических Наночастиц

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