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

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Sammanfattning

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.

Originalspråkengelska
Artikelnummer106146
Antal sidor11
TidskriftJournal of Aerosol Science
Volym170
DOI
StatusPublished - 2023 maj

Bibliografisk information

Funding Information:
This research received funding from the European Union’s H2020 MSCA (Grant No. 945378 ) (GenerationNano), the Swedish Research Council (Grant No. 2019-04970 ), the Swedish Foundation for Strategic Research (Grant No. FFL18-0282 ), the Swedish Energy Agency (Grant No. 50689-1 ), and NanoLund . We acknowledge Régis Ravelle-Chapuis for his help in the STEM-EDS data acquisition, Crispin Hetherington for his support in the transmission electron microscope, and Markus Snellman and Calle Preger for the data discussions. Part of the experimental work was performed in Lund Nano Lab, part of Myfab research infrastructure.

Funding Information:
This research received funding from the European Union's H2020 MSCA (Grant No. 945378) (GenerationNano), the Swedish Research Council (Grant No. 2019-04970), the Swedish Foundation for Strategic Research (Grant No. FFL18-0282), the Swedish Energy Agency (Grant No. 50689-1), and NanoLund. We acknowledge Régis Ravelle-Chapuis for his help in the STEM-EDS data acquisition, Crispin Hetherington for his support in the transmission electron microscope, and Markus Snellman and Calle Preger for the data discussions. Part of the experimental work was performed in Lund Nano Lab, part of Myfab research infrastructure.

Publisher Copyright:
© 2023 The Author(s)

Ämnesklassifikation (UKÄ)

  • Nanoteknik

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