Carbon coated TiO2 nanoparticles prepared by pulsed laser ablation in liquid, gaseous and supercritical CO2

Amandeep Singh (Corresponding Author), Turkka Salminen, Mari Honkanen, Juha Pekka Nikkanen, Tommi Vuorinen, Risto Kari, Jorma Vihinen, Erkki Levänen

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2 Citations (Scopus)

Abstract

We report on the synthesis of TiO2 nanoparticles using nanosecond pulse laser ablation of titanium in liquid, gaseous and supercritical CO2. The produced particles were observed to be mainly anatase-TiO2 with some rutile-TiO2. In addition, the particles were covered by a carbon layer. Raman and x-ray diffraction data suggested that the rutile content increases with CO2 pressure. The nanoparticle size decreased and size distribution became narrower with the increase in CO2 pressure and temperature, however the variation trend was different for CO2 pressure compared to temperature. Pulsed laser ablation in pressurized CO2 is demonstrated as a single step method for making anatase-TiO2/carbon nanoparticles throughout the pressure and temperature ranges 5-40 MPa and 30 °C-50 °C, respectively.

Original languageEnglish
Article number085602
Number of pages12
JournalNanotechnology
Volume31
Issue number8
DOIs
Publication statusPublished - 1 Jan 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • anatase-TiO Raman XPS XRD
  • core shell particles
  • high pressure CO
  • metastable phase
  • nanoparticle size control
  • pulsed laser ablation
  • supercritical fluids

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    Singh, A., Salminen, T., Honkanen, M., Nikkanen, J. P., Vuorinen, T., Kari, R., Vihinen, J., & Levänen, E. (2020). Carbon coated TiO2 nanoparticles prepared by pulsed laser ablation in liquid, gaseous and supercritical CO2. Nanotechnology, 31(8), [085602]. https://doi.org/10.1088/1361-6528/ab53ba