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Synthesis of mixed metallic nanoparticles by spark discharge

Tabrizi, N. S. and Xu, Q. and van der Pers, N. M. and Lafont, U. and Schmidt-Ott, A. (2009) Synthesis of mixed metallic nanoparticles by spark discharge. Journal of Nanoparticle Research, 11 (5). pp. 1209-1218.

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Official URL: http://www.springerlink.com/content/l486516h5r4014...

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.

Item Type:Article
Subjects:Technology > Manufacturing processes for nanotechnology
Material Science > Nanostructured materials
ID Code:5577
Deposited By:IoN
Deposited On:29 Jun 2009 15:58
Last Modified:29 Jun 2009 15:58

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