Chemical synthesis and structural characterization of small AuZn nanoparticles |
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Authors: | E. Juárez-Ruiz U. Pal J.A. Lombardero-Chartuni A. Medina J.A. Ascencio |
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Affiliation: | (1) Facultad de Ciencias de la Electrónica, Universidad Autónoma de Puebla, 18 Sur y San Claudio, C.U., Puebla, Puebla, 72570, Mexico;(2) Instituto de Física, Universidad Autónoma de Puebla, PO Box J-48, Puebla, 72570, Mexico;(3) Universidad La Salle Benavente, 25 Ote. 9, Col. El Carmen, Puebla, 72000, Mexico;(4) Universidad Michoacana de San Nicolas de Hidalgo, “Edif. U”, C. U., Morelia, 58000, Mexico;(5) Ductos, Corrosion y Materiales, Instituto Mexicano del Petróleo, Lazaro Cardenas 152, Col San Bartolo Atepehuacan México, Distrito Federal, 07730, Mexico |
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Abstract: | In this paper, we report the aqueous synthesis of bimetallic Au-Zn nanoparticles of different compositions by the simultaneous reduction technique. The stability and atomic configuration of the particles are studied through high-resolution transmission electron microscopy (HRTEM) and UV-Vis optical absorption techniques. Depending on the composition, small bimetallic nanoparticles of 1–15 nm in size were obtained. The average size and size distribution of the bimetallic nanoparticles are seen to be critically dependent on the atomic ratio of the constituting elements Au and Zn. While a 1:1 atomic proportion of Au and Zn produced most stable nanoparticles of smallest average size, nanoparticles produced with higher content of either of the component elements are unstable, inducing agglomeration and coalescence to form elongated structures with uneven morphologies. Au3Zn1 nanoparticles followed a directional growth pattern, producing bimetallic nanorods with multiple crystalline domains. Interestingly, in these rod-like nanostructures, the domains are in well array of solid solution-like bimetallic and pure mono-metallic regions alternatively. Such nanostructures with uneven morphology and compositions might show distinct catalytic selectivity in chemical reactions. PACS 61.46.-w; 87.64.Ee; 74.62.Bf |
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