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Tuning morphology, surface, and nanocrystallinity of rare earth vanadates by one-pot colloidal conversion of hydroxycarbonates
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Guida, Gabriela, Huband, Steven, Walker, Marc, Walton, Richard I. and de Sousa Filho, Paulo C. (2021) Tuning morphology, surface, and nanocrystallinity of rare earth vanadates by one-pot colloidal conversion of hydroxycarbonates. Nanoscale . doi:10.1039/D0NR07902B ISSN 2040-3364.
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WRAP-Tuning-morphology-surface-nanocrystallinity-rare-earth-2021.pdf - Accepted Version - Requires a PDF viewer. Download (13Mb) | Preview |
Official URL: http://dx.doi.org/10.1039/D0NR07902B
Abstract
We show that particle size, morphology, nanocrystallinity, surface area, and defect density of (Y,Eu)VO4 structures can be tuned by one-pot colloidal conversion of rare earth hydroxycarbonates in water/ethylene glycol (EG) suspensions. Using small angle X-ray scattering, transmission electron microscopy and dynamic light scattering, we show how volume fractions of EG direct the amorphous to crystalline conversion at 1 atm/95 °C by controlling size and aggregation of hydroxycarbonate precursors. A template effect due to a Kirkendall-type conversion occurs for low EG contents, yielding solids with high densities of oxygen defects, as demonstrated by O2 uptakes in thermogravimetry and X-ray photoelectron spectroscopy profiles. Starting from small and aggregated hydroxycarbonates high-porosity (Y,Eu)VO4 nanoparticles were produced with expanded unit cells and short-range (<100 Å) crystalline ordering. We explored the effects of synthesis on the textural, microstructure, and defects of (Y,Eu)VO4 solids, which were further correlated to the spectroscopic profiles of Eu3+-activated samples. We show that the ratios between Eu3+ 5D0 internal quantum yields and particle diameters can be directly correlated to the particle surface areas, opening new perspectives for theoretical detailing of f–f luminescence in YVO4 solids, and enabling accurate tuning of structure and applicability of colloidal vanadate nanoparticles for sensing and catalysis applications.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QD Chemistry | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Science > Physics |
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Library of Congress Subject Headings (LCSH): | Rare earth metal compounds, Kirkendall effect , Nanocrystals -- Synthesis , Colloids | |||||||||
Journal or Publication Title: | Nanoscale | |||||||||
Publisher: | Royal Society of Chemistry | |||||||||
ISSN: | 2040-3364 | |||||||||
Official Date: | 22 February 2021 | |||||||||
Dates: |
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DOI: | 10.1039/D0NR07902B | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 25 February 2021 | |||||||||
Date of first compliant Open Access: | 22 February 2022 | |||||||||
RIOXX Funder/Project Grant: |
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