Technology and Applications

Journal of Nanoparticle Research

, Volume 11, Issue 5, pp 1209-1218

Synthesis of mixed metallic nanoparticles by spark discharge

  • N. S. TabriziAffiliated withNanostructured Materials, Faculty of Applied Sciences, Delft University of Technology
  • , Q. XuAffiliated withLaboratory for Material Science, National Centre for HREM, Delft University of Technology
  • , N. M. van der PersAffiliated withDepartment of Materials Science and Engineering, Faculty of 3mE, TUDelft
  • , U. LafontAffiliated withNanostructured Materials, Faculty of Applied Sciences, Delft University of Technology
  • , A. Schmidt-OttAffiliated withNanostructured Materials, Faculty of Applied Sciences, Delft University of Technology Email author 

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Abstract

Short spark discharges (2 μs) were successfully applied to generate mixed particles a few nanometres in diameter by fast quenching. Alloyed Cr–Co electrodes were applied to demonstrate this. Further it was shown that if the anode and the cathode are different materials, the discharge process mixes the vapour of both materials, forming mixed nanoparticles. Electron microscopy (TEM, SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analyses were performed on the collected particles to study their size, morphology, composition and structure. The average compositions of the particles were measured by inductively coupled plasma (ICP). In addition, online measurements of the particle size distribution by mobility analysis were carried out. In the case of alloyed electrodes (Cr–Co), the relative concentration of the elements in the nanoparticulate sample was consistent with the electrode composition. When using electrodes of different metals (Au–Pd and Ag–Pd) the individual nanoparticles showed a range of mixing ratios. No surface segregation was observed in these mixed noble metal particles. Crystalline nanoparticulate mixed phases were found in all cases.

Keywords

Spark discharge Bimetallic nanoparticles Mixed nanoparticles Metallic nanoparticles Nanomanufacturing