Optical properties of ThO 2 –based nanoparticles
| Autor: | M.D. Vázquez, Luis Deban, M. A. Castro, A. J. Aller, Fernando Antonio de Melo Pereira |
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| Rok vydání: | 2017 |
| Předmět: |
Photoluminescence
Materials science Absorption spectroscopy Band gap Doping Biophysics Analytical chemistry Nanoparticle 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics 0104 chemical sciences Nanomaterials Photoluminescence excitation 0210 nano-technology Absorption (electromagnetic radiation) |
| Zdroj: | Journal of Luminescence. 184:169-178 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2016.12.025 |
| Popis: | Thoria nanomaterials show great interest in different fields other than nuclear technology. In this work, optical characteristics of four types of thoria-based nanoparticles were evaluated. The ultraviolet-visible (UV–vis) absorption spectrum of the pure (undoped/uncapped) thoria nanoparticles was characterised by an intense peak at 222 nm, while the doped/capped thoria nanoparticles shown maximum absorption peaks at both 195/200 nm and 233 nm. Contrarily to the particle size, the band gap energy of the thoria nanoparticles decreased with the doping/capping process using arsenic (As(III))/cysteine (Cyst). The room-temperature photoluminescence excitation spectra were featured by two bands located at 268 nm for both pure and As-doped thoria nanoparticles and at 352 nm for all thoria-based nanoparticles studied, recording the photoluminescence emission at 500 nm. The characteristic wavelengths of the photoluminescence emission spectra were at 325 and 385 nm for the pure and As-doped thoria nanoparticles, while only the band at 385/415 nm was noted for the Cyst-capped thoria nanoparticles, with slightly red shift depending on the excitation wavelength. |
| Databáze: | OpenAIRE |
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