The Effect of Dielectric Coating on the Local Electric Field Enhancement of Au-Ag Core-Shell Nanoparticles

A Rapid Surface-Enhanced Raman Scattering (SERS) Method for Pb2+ Detection Using L-Cysteine-Modified Ag-Coated Au Nanoparticles with Core–Shell Nanostructure

“…From Figure 3, the absolute values of SERS intensities increased in the order AuNPs < Au@Ag NPs < AuNP aggregates < Au@Ag NP aggregates. The Raman signal of Au@Ag NP aggregates (CPb 2+ = 5 nM) was strikingly higher than that of the Au NP aggregates at 1582 cm −1 , demonstrating enhanced SERS activity through the local electric field enhancement of the Au-Ag bimetallic nanoshell [30]. The value of SERS analytical enhancement factors (AEF) of Au@AgNPs aggregation is 5.5-fold than that of aggregation AgNPs.…”

Plasmon-enhanced solar vapor generation

“…One may find that NPs with sharper corners (like triangles) can generate higher local field enhancement than isotropic smooth particles, similar to those observed in heterogeneous systems [10,20,43,51]. In addition, larger field enhancement can be suggested by close packed particles assembled with decreasing intergaps ( Figure 2E The dependence of absorption spectra of plasmonic materials on (A) size for the same Au spherical shape [37], (B) assembly [69], and (C) shape [67]; the dependence of near electromagnetic field enhancement on (D) materials [65] Dielectric environment is a third parameter for manipulating both plasmonic resonant wavelength and field enhancement [10,20,68]. Zhao et al calculated the field enhancement of bimetallic nanocore/shells (the inner gold core with a radius of 5 nm and the silver shell with a thickness of 15 nm) as a function of dielectric coating thickness as well as dielectric constant of surroundings [68].…”

“…Ideal photothermal utilization of SVG requires both broadband light absorption over the solar spectrum in the far field and light-induced heat localization in the near field. The development of plasmonics and metamaterials has revealed that the resonant frequency and intensity of plasmon excitations are strongly dependent on the intrinsic material properties [10,65], including sizes [37,66], shapes [48,67], surrounding environment [10,20,68], and assembly profiles [20,69]. Figure 2 summarizes some primary factors that can contribute to the tunability of absorption spectra [37,69,70] as well asthe enhancement of localized electromagnetic fields [51,65,68].…”

Металлодиэлектрические Наночастицы Типа Ядро–оболочка

“…Такие частицы в современной научной терминологии получили название частиц типа ядро-оболочка. Исследовательский интерес к теоретическому изучению металлодиэлектрических наночастиц типа ядрооболочка подтверждается большим количеством публикаций на эту тему в научных изданиях [1][2][3][4][5][6][7].…”