Generation of mixed metallic nanoparticles from immiscible metals by spark discharge |
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| Authors: | N S Tabrizi Q Xu N M van der Pers and A Schmidt-Ott |
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| Institution: | (1) Nanostructured Materials, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands;(2) Laboratory for Material Science, National Centre for HREM, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands;(3) Department of Materials Science and Engineering, Faculty of 3mE, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands; |
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| Abstract: | Using a spark discharge system, we synthesized Ag-Cu, Pt–Au and Cu-W mixed particles a few nanometers in size. These combinations
have miscibility gaps in the bulk form. The microsecond sparks between electrodes consisting of the respective materials,
form a vapour cloud. Very fast quenching of the mixed vapour results in the formation of nanoparticles. To investigate the
morphology, size, composition and structure of the particles, TEM, XRD analyses and EDS elemental mapping were performed on
the samples. The average compositions were measured by ICP and the specific surface areas were determined by the BET. Our
method produces Ag-Cu and Au–Pt mixed crystalline phases that do not exist in macroscopic samples. For Cu-W, alloying is not
observed, and the metals are mixed on a scale of about 1 nm. |
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