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Effect of external electric field on the formation of colloidal Ag–Au alloy nanoparticles through laser post-irradiation
Journal of Nanophotonics ( IF 1.5 ) Pub Date : 2021-06-01 , DOI: 10.1117/1.jnp.15.026009
Ehsan Ahmadinejad 1 , Mohammd H. Mahdieh 1
Affiliation  

We report the synthesis of Ag–Au alloy nanoparticles (NPs) by post-irradiation of mixed colloidal Ag and Au NPs by a nanosecond pulse laser in the presence of an external electric field (EEF). In our study, size, optical, and plasmonic properties of colloidal Ag–Au alloy NPs were investigated. A colloid of individual Ag and Au NPs were separately prepared by nanosecond pulsed laser ablation in distilled water. An appropriate volume of these colloidal NPs samples was mixed and post-irradiated with the same pulsed laser beam in the presence of a uniform electric field, resulting in the formation of Ag–Au alloy NPs. The synthesized colloidal alloy NPs were characterized using scanning electron microscopy and UV–vis absorption spectroscopy. The results indicate that the EEF can reduce significantly the Ag–Au alloy formation time. The results also show that the wavelength of the localized surface plasmon resonance of alloy NPs decreased by the applied electric field.

中文翻译:

外电场对激光后辐照形成胶体Ag-Au合金纳米粒子的影响

我们报告了在外部电场 (EEF) 存在下,通过纳秒脉冲激光对混合胶体 Ag 和 Au NPs 进行后照射合成 Ag-Au 合金纳米粒子 (NPs)。在我们的研究中,研究了胶体 Ag-Au 合金纳米粒子的尺寸、光学和等离子体特性。通过纳秒脉冲激光烧蚀在蒸馏水中分别制备单个 Ag 和 Au NP 的胶体。将适量的这些胶体 NPs 样品混合并在均匀电场存在下用相同的脉冲激光束进行后照射,从而形成 Ag-Au 合金 NPs。使用扫描电子显微镜和紫外-可见吸收光谱对合成的胶体合金纳米颗粒进行表征。结果表明EEF可以显着减少Ag-Au合金的形成时间。
更新日期:2021-06-23
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