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Platinum and platinum oxide nanoparticles generated by unipolar spark discharge
Ist Teil von
Journal of aerosol science, 2020-03, Vol.141, p.105502, Article 105502
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Platinum nanoparticles were generated by spark discharge in forming gas (95 vol% nitrogen and 5 vol% hydrogen) and in air. An in-house developed spark discharge generator was used featuring unipolar spark discharge characteristics. Platinum nanoparticles generated in forming gas are pure platinum, crystalline, and 2–10 nm in diameter. However, spark discharge in air produces complex, 10–50 nm, amorphous, non-stoichiometric platinum oxide particles containing nanocrystals of pure platinum about 5 nm in size on the surface. Independently of the carrier gas, the produced material also contains spherical fine particles of hundreds of nanometers in diameter, which are composed of platinum only. The amount of the spherical fine particles was quantified by X-ray diffraction, resulting in about 10% and 14% weight fraction, when generated in forming gas and in air, respectively.
•A spark discharge generator was constructed with unipolar discharge characteristics and adjustable spark frequency.•Crystalline platinum and amorphous platinum oxide nanoparticles were synthesized in forming gas and in air, respectively.•Electron microscopy showed the presence of nanoparticles (2–50 nm in diameter) and spherical fine particles (>100 nm).•X-ray diffraction analysis was used to quantify the weight fraction of spherical fine platinum particles.•High-speed imaging revealed the presence of cathode hot spots representing the primary locations of metal evaporation.