Multiphase TixOy nanoparticles by pulsed laser ablation of titanium in supercritical CO2

Amandeep Singh; Turkka Salminen; Mari Honkanen; Jorma Vihinen; Leo Hyvärinen; Erkki Levänen

doi:10.1016/j.apsusc.2019.01.172

Multiphase TixOy nanoparticles by pulsed laser ablation of titanium in supercritical CO2

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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	https://doi.org/10.1016/j.apsusc.2019.01.172
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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10.1016/j.apsusc.2019.01.172

Multiphase TixOy nanoparticles by pulsed laser ablation 2019
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http://urn.fi/URN:NBN:fi:tuni-202101211556Licence: CC BY-NC-ND

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Levänen, E. (Contact) & Frankberg, E. (Contact)
Materials Science and Environmental Engineering
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Vippola, M. (Manager), Honkanen, M. (Operator) & Salminen, T. (Operator)
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title = "Multiphase TixOy nanoparticles by pulsed laser ablation of titanium in supercritical CO2",

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).",

author = "Amandeep Singh and Turkka Salminen and Mari Honkanen and Jorma Vihinen and Leo Hyv{\"a}rinen and Erkki Lev{\"a}nen",

year = "2019",

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doi = "10.1016/j.apsusc.2019.01.172",

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journal = "Applied Surface Science",

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T1 - Multiphase TixOy nanoparticles by pulsed laser ablation of titanium in supercritical CO2

AU - Singh, Amandeep

AU - Salminen, Turkka

AU - Honkanen, Mari

AU - Vihinen, Jorma

AU - Hyvärinen, Leo

AU - Levänen, Erkki

PY - 2019/1/23

Y1 - 2019/1/23

N2 - 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).

AB - 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).

U2 - 10.1016/j.apsusc.2019.01.172

DO - 10.1016/j.apsusc.2019.01.172

M3 - Article

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VL - 476

SP - 822

EP - 827

JO - Applied Surface Science

JF - Applied Surface Science

ER -

Multiphase TixOy nanoparticles by pulsed laser ablation of titanium in supercritical CO2

Abstract

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