Synthesis of Near-Monodispersed Au–Ag Nanoalloys by High Intensity Laser Irradiation of Metal Ions in Hexane

A wet photochemical reduction approach was performed using highly intense femtosecond laser pulses to synthesize gold–silver (Au–Ag) alloy nanoparticles in hexane in the presence of dodecylamine in various composition ratios. Not only monometallic gold (Au) and silver (Ag) but also its bimetallic particles were successfully fabricated with the average size of 2–5 nm, well separated to each other and thus, essentially near-monodispersed. The formation of Au–Ag alloy nanoparticles was confirmed by UV–visible spectroscopy of the synthesized organosols showing only a single absorption peak and its position linearly varies with Au molar fraction in the prepared solution. The trend in plasmon modifications such as the decrease of absorbance and plasmon bandwidth with an increase of Au molar fraction as suggested by Mie theory were not observed, indicating the fabricated particles were different in size for the different molar ratios in the solution.

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