The Structural Change Of Silver Nannoparticles

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Systematic studies on the structural change of silver nanoparticles, which are easy to change shape and exhibit excellent localized surface plasmon resonance effect, were carried out and the predicted shape change was compared to the actual nanoparticles. Herein, key information on the alteration of silver nanoparticles was determined theoretically by a computational method, discrete dipole approximation (DDA). The galvanic reaction and sulfidation reaction were suggested to improve the stability of silver nanoprism (AgNP). In addition, the effect of additionally generated spherical particles, silver nanosphere (AgNS), on the absorbance was studied. Both AgNP and AgNS formed hollow nanostructure after the galvanic reaction, and these…show more content…
The first solution for the scattering and absorption properties of a spherical nanoparticle was provided by Mie et al. [10,11]. Since the initial development of Mie theory, it is now well known that the strong optical properties of plasmonic nanoparticles result from an induced coherent oscillation of the free conduction-band electrons within the plasmonic nanoparticle. Thus, in our previous studies [12,13], bimetallic Au/Ag nanoframes with excellent LSPR feature were prepared via the galvanic replacement reaction and sulfidation and successfully used as the spectator for Co2+ ion. However, there is no theoretical interpretation of color changes with structural transformation of Au/Ag nanoframes from Ag nanoprisms. Therefore, herein, we used a theoretical approach to determine the key information on the alteration of Ag nanoparticles by using a computational method, discrete dipole approximation (DDA). It is very adaptive to deal with various particle shapes, not just limited to highly symmetrical geometries. DDA is used to estimate the optical properties of plasmonic materials responding to external electrical field through dipole moments of discretized dipoles [14–17]. The absorbance of the particles was calculated by the Discrete Dipole Scattering (DDSCAT ver. 7.3), which was used to design highly stable nanoparticles with absorbance in the visible
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