Abstract
It is proposed to synthesize silver-gold alloy nanoparticles by direct pulsed laser ablation of joined Ag and Au monometallic targets. To avoid utilizing a high-vacuum chamber, this pulsed laser-assisted technique is performed in an isolated beaker containing pure helium gas at atmospheric pressure. The structure and formation mechanism of the homogeneous Ag–Au nanoalloy particles on the Si substrate surface are discussed. Here, as in other works, the formation of the Ag–Au alloy nanoparticles was verified by the appearance of a surface plasmon absorption maximum at 442 nm between the surface plasmon resonance peaks of the corresponding monometallic particles, and by results of X-ray photoelectron spectroscopy. Based on data of UV-visible spectroscopy and energy dispersive X-ray analysis, the atomic contents of Ag and Au are determined in the nanoalloy particles. Transmission electron microscopy (TEM) showed the synthesized semispherical nanoalloy particles, 5–35 nm in diameter, with a narrow particle size distribution. The related morphology, structure, and chemical composition are also investigated using atomic force microscopy, lateral force microscopy, and X-ray diffraction. The suggested approach is affordable, fast, and inexpensive.
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