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Portrait pf Mehran Sedrpooshan

Mehran Sedrpooshan

Doctoral student

Portrait pf Mehran Sedrpooshan

Effect of the carrier gas on the structure and composition of Co–Ni bimetallic nanoparticles generated by spark ablation


  • Pau Ternero
  • Mehran Sedrpooshan
  • David Wahlqvist
  • Bengt O. Meuller
  • Martin Ek
  • Julia-Maria Hübner
  • Rasmus Westerström
  • Maria E. Messing

Summary, in English

Spark ablation is a versatile technique for producing pure size-selected nanoparticles. The carrier gas used in spark ablation affects the nanoparticles’ generation, crystalline structure, and chemical composition. The comprehension of this phenomenon can contribute to the design of nanoparticles with tailored properties. In this paper, we evaluate the effects of reducing (95%N2 + 5%H2), inert (N2), and oxidative (air) carrier gases in a spark ablation setup with Co–Ni alloyed electrodes. The agglomerates’ particle size distribution, morphology, structure, and composition were highly dependent on the carrier gas, especially its relative oxygen content. The agglomerates were then sintered into compacted particles. Three different crystalline structures and chemical compositions were observed with X-ray diffraction and confirmed with transmission electron microscopy for the compacted particles. For 95%N2 + 5%H2 and air, single-phase (Co,Ni) and (Co,Ni)O particles were identified, respectively, whereas for N2, two-phase (Co,Ni) and (Co,Ni)O particles were obtained. This work opens up new possibilities of tuning the structure and composition, i.e., distribution of metallic and oxide phases, of the produced particles and thus tailor their properties for specific applications by simply changing the carrier gas.


  • LU Profile Area: Light and Materials
  • Solid State Physics
  • NanoLund: Center for Nanoscience
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • LTH Profile Area: Aerosols
  • Synchrotron Radiation Research
  • Centre for Analysis and Synthesis
  • LTH Profile Area: Photon Science and Technology

Publishing year





Journal of Aerosol Science



Document type

Journal article




  • Nano Technology


  • Bimetallic nanoparticles
  • Carrier gas
  • Spark ablation




  • ISSN: 0021-8502