Tuning the Composition of Alloy Nanoparticles Through Laser Mixing: The Role of Surface Plasmon Resonance

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• 作者：Gabriele C. Messina ; Marco G. Sinatra ; Valentina Bonanni ; Rosaria Brescia ; Alessandro Alabastri ; Francesco Pineider ; Giulio Campo ; Claudio Sangregorio ; Giovanni Li-Destri ; Gianfranco Sfuncia ; Giovanni Marletta ; Marcello Condorelli ; Remo Proietti Zaccaria ; Francesco De Angelis ; Giuseppe Compagnini
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 16, 2016
• 年：2016
• 卷：120
• 期：23
• 页码：12810-12818
• 全文大小：540K
• 年卷期：0
• ISSN：1932-7455

文摘

In this work we report a technique for the preparation of Au_xNi_1–x alloy nanoparticles based on pulsed laser irradiation in liquid of Au and Ni@NiO colloidal mixtures. The structural and compositional characterization of the obtained materials, performed through X-ray diffraction and transmission electron microscopy coupled with energy dispersive X-ray spectroscopy, has shown a correlation between the final alloy composition and the different Au to Ni@NiO ratio in the irradiated mixture. With the support of theoretical calculations, we propose as possible mechanism for the formation of the alloy structures a temperature increase, enhanced by the strong absorption of gold surface plasmon resonance at resonant wavelength, and a subsequent melting of the structures. Optical characterization through UV–vis spectroscopy and magnetic characterization through SQUID magnetometry confirm a coexistence of the plasmonic and magnetic behaviors in the hybrid systems. In view of such results, Au_xNi_1–x alloy nanoparticles could be a promising base material for devices requiring both plasmonic and magnetic properties.