Multiphase TixOy nanoparticles by pulsed laser ablation of titanium in supercritical CO2
Singh, Amandeep; Salminen, Turkka; Honkanen, Mari; Vihinen, Jorma; Hyvärinen, Leo; Levänen, Erkki (2019-01-23)
Singh, Amandeep
Salminen, Turkka
Honkanen, Mari
Vihinen, Jorma
Hyvärinen, Leo
Levänen, Erkki
23.01.2019
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202101211556
https://urn.fi/URN:NBN:fi:tuni-202101211556
Kuvaus
Peer reviewed
Tiivistelmä
In this paper, we demonstrate pulsed laser ablation (PLA) in supercritical CO2 (scCO2) as a promising method to synthesize multiphase TixOy nanoparticles from a titanium target. These results are compared against PLA of titanium in H2O. By means of transmission electron microscopy, we observed spherical-shaped, well-dispersed non-agglomerate crystalline nanoparticles by PLA in scCO2 while PLA in H2O produced spherical-shaped as well as randomly shaped nanoparticles that joined to form web-like networks. Raman spectroscopy and x-ray diffraction showed nanoparticles synthesized in scCO2 consisted of anatase-TiO2, Ti2O3 and TiO0.89 while nanoparticles synthesized in H2O were mainly rutile-TiO2, with possibility of presence of brookite-TiO2. This indicates PLA in scCO2 favours formation of metastable phases (anatase-TiO2, Ti2O3 and TiO0.89) while PLA in H2O results in mostly stable phase (rutile-TiO2).
Kokoelmat
- TUNICRIS-julkaisut [17001]