Abstract
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).
| Original language | English |
|---|---|
| Pages (from-to) | 822-827 |
| Number of pages | 6 |
| Journal | Applied Surface Science |
| Volume | 476 |
| DOIs | |
| Publication status | Published - 23 Jan 2019 |
| Publication type | A1 Journal article-refereed |
Funding
This work was supported by European Commission's Horizon 2020 project 'NanoStencil' - Proposal number 767285 . We acknowledge the provision of facilities and technical support by Aalto University at OtaNano - Nanomicroscopy Center (Aalto-NMC). We acknowledge senior scientist Dr. Hua Jiang for performing high resolution TEM studies at Aalto University. This work made use of Tampere Microscopy Center facilities at Tampere University.
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