Synthesis, structural and optical properties of CeO2 nanoparticles synthesized by a simple polyvinyl pyrrolidone (PVP) solution route

Phoka, Sumalin; Laokul, Paveena; Swatsitang, Ekaphan; Promarak, Vinich; Seraphin, Suṗapan; Maensiri, Santi

doi:10.1016/j.matchemphys.2008.12.031

Cited by 364 publications

(177 citation statements)

References 47 publications

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“…The estimated bandgap of the CeO 2 nanoparticles was 3.00 eV (or 2.29 eV using the KM function), which was within the range of 3.00-3.63 reported in the literature (Masui et al 1997;Phoka et al 2009). A gradual change (blue shift) in the optical bandgap was observed for samples 10 Zn-Ce at 3.28 eV (KM = 2.79 eV), 20 ZnCe at 3.35 eV (KM = 2.88), 30 Zn-Ce at 3.45 eV (KM = 2.98) and 40 Zn-Ce at 3.4 eV (KM = 3.02 eV).…”

Section: Resultssupporting

confidence: 82%

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High-throughput continuous hydrothermal flow synthesis of Zn–Ce oxides: unprecedented solubility of Zn in the nanoparticle fluorite lattice

Kellici

Gong

Lin

et al. 2010

Phil. Trans. R. Soc. A.

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High-throughput continuous hydrothermal flow synthesis has been used as a rapid and efficient synthetic route to produce a range of crystalline nanopowders in the CeZn oxide binary system. High-resolution powder X-ray diffraction data were obtained for both as-prepared and heat-treated (850• C for 10 h in air) samples using the new robotic beamline I11, located at Diamond Light Source. The influence of the sample composition on the crystal structure and on the optical and physical properties was studied. All the nanomaterials were characterized using Raman spectroscopy, UV-visible spectrophotometry, Brunauer-Emmett-Teller surface area and elemental analysis (via energy-dispersive X-ray spectroscopy). Initially, for 'as-prepared' Ce 1−x Zn x O y , a phasepure cerium oxide (fluorite) structure was obtained for nominal values of x = 0.1 and 0.2. Biphasic mixtures were obtained for nominal values of x in the range of 0.3-0.9 (inclusive). High-resolution transmission electron microscopy images revealed that the phase-pure nano-CeO 2 (x = 0) consisted of ca 3.7 nm well-defined nanoparticles. The nanomaterials produced herein generally had high surface areas (greater than 150 m 2 g −1 ) and possessed combinations of particle properties (e.g. bandgap, crystallinity, size, etc.) that were unobtainable or difficult to achieve by other more conventional synthetic methods.

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Section: Resultssupporting

confidence: 82%

“…A slight blue shift in the Raman bands of Zn-Ce oxide samples with respect to those of ZnO itself was observed. This could be due to change in lattice constant upon Ce incorporation into the ZnO lattice (Yang et al 2008;Phoka et al 2009). …”

Section: Resultsmentioning

confidence: 99%

High-throughput continuous hydrothermal flow synthesis of Zn–Ce oxides: unprecedented solubility of Zn in the nanoparticle fluorite lattice

Kellici

Gong

Lin

et al. 2010

Phil. Trans. R. Soc. A.

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“…Herein, α and hυ represent the absorption coefficient and photon energy, respectively. According to the equation 17 where E D is a constant, the optical bandgap energy of the CeO 2 film is derived to be ∼3.62 eV, which is consistent with the experimentally and theoretically derived values reported previously. 9,[17][18][19] It should be noted that the optical bandgap energy of the 450 • C-annealed CeO 2 film is almost the same.…”

Section: Resultssupporting

confidence: 89%

Ultraviolet-visible electroluminescence from metal-oxide-semiconductor devices with CeO2 films on silicon

Zhu

Wang

et al. 2015

AIP Advances

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We report on ultraviolet-visible (UV-Vis) electroluminescence (EL) from metal-oxide-semiconductor (MOS) devices with the CeO2 films annealed at low temperatures. At the same injection current, the UV-Vis EL from the MOS device with the 550 °C-annealed CeO2 film is much stronger than that from the counterpart with the 450 °C-annealed CeO2 film. This is due to that the 550 °C-annealed CeO2 film contains more Ce3+ ions and oxygen vacancies. It is tentatively proposed that the recombination of the electrons in multiple oxygen-vacancy–related energy levels with the holes in Ce 4f1 energy band pertaining to Ce3+ ions leads to the UV-Vis EL.

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“…A relationship between particle size and FWHM broadening for CeO 2 nanoparticles has been previously reported in the form: [18][19][20] …”

Section: -4mentioning

confidence: 99%

Influence of the nanoparticles agglomeration state in the quantum-confinement effects: Experimental evidences

2015

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The agglomeration state facilitates particle-particle interaction which produces important effects in the phonon confinement effects at the nanoscale. A partial phonon transmission between close nanoparticles yields a lower momentum conservation relaxation than in a single isolated nanoparticle. It means a larger red shift and broadening of the Raman modes than the expected ones for Raman quantum confinement effects. This particle-particle interaction can drive to error when Raman responses are used to estimate the size of the nanoscaled materials. In this work different corrections are suggested to overtake this source of error.

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Synthesis, structural and optical properties of CeO2 nanoparticles synthesized by a simple polyvinyl pyrrolidone (PVP) solution route

Cited by 364 publications

References 47 publications

High-throughput continuous hydrothermal flow synthesis of Zn–Ce oxides: unprecedented solubility of Zn in the nanoparticle fluorite lattice

High-throughput continuous hydrothermal flow synthesis of Zn–Ce oxides: unprecedented solubility of Zn in the nanoparticle fluorite lattice

Ultraviolet-visible electroluminescence from metal-oxide-semiconductor devices with CeO2 films on silicon

Influence of the nanoparticles agglomeration state in the quantum-confinement effects: Experimental evidences

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