We report the highly simple synthetic strategy to prepare solid silver-core gold-shell nanoparticles possessing tunable absorption properties.  The diameters of the cores and thickness of the shells are easily controlled by the molar ratio of silver to gold salt solutions at room temperature.  These nanoparticles exhibit broad, strong absorbance from visible to near infrared. Subsequently, the systematic transformation of the core-shell particles to anisotropic structures is achieved under visible light irradiation.  The resulting anisotropic nanoparticles exhibit a higher surface area to volume ratio, and much strong and broader absorption band as a function of the roughness.  The tunable, strong absorption band and high surface area of these anisotropic nanoparticles may be beneficial for potential applications including catalytic reactions, optical devices, and photothermal systems.

Synthesis and transformation of gold-silver composite nanoparticles

243rd National Meeting (2012)

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