Origin of the Blue Shift in Ultraviolet Absorption Spectra of Nanocrystalline CeO&lt;SUB&gt;2&amp;minus;&lt;I&gt;x&lt;/I&gt;&lt;/SUB&gt; Particles

Tsunekawa, Shin; Sahara, Ryoji; Kasuya, A.

doi:10.2320/matertrans1989.41.1104

Cited by 110 publications

(63 citation statements)

References 20 publications

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“…17 The Raman mode position and Full Width at Half Maximum (FWHM) for the isolated nanoparticles agree well with previously reported results on isolated nanoparticles of similar size. 6 On the other hand, in the case of the agglomerated nanoparticles, a larger red-shift of the modes position (and bigger FWHM) is observed, even though the nanoparticles present the same size and structure. Values of Raman mode shift and FWHM similar to the ones of agglomerated nanoparticles have been previously reported for nanoparticles of ∼8 nm, 15 even though the actual size of our nanoparticles is much larger, ∼20nm.…”

Section: -4mentioning

confidence: 97%

“…4 These new available vibration modes produce a strongly particle-size dependent displacement and broadening of the Raman spectrum, as previously described by H. Richter et al 6 The above mentioned quantum effects has been proposed as a tool to determine particles size by different analytical methods. 4,5 Nonetheless, there are many examples in the literature presenting a bad agreement between the particle size estimated from these calculations and the actual particle size measured by other methods.…”

Section: Introductionmentioning

confidence: 93%

“…6,7 Due to these properties, ceria based materials can find applications for catalysis, 8 as a potentially useful solid oxide fuel cell electrolyte material, 9 and in optical coatings 10 and gas sensors. 11,12 Some of these applications may benefit from using CeO 2 nanoparticles, due to the possibility to present new properties in the nanodimension and the increased material surface.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: -4mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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

2015

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“…Major potential applications of CeO 2 are ultraviolet radiation absorbent [1], catalytic support or promoter [2], oxygen ion conductor in solid oxide fuel cells (SOFCs) [3], gas sensor [4], hybrid solar cells [5], H 2 S removal [6], luminescent materials for violet/blue fluorescence [7], water gas shift reaction, oxidative dehydrogenation [8] etc. CeO 2 can be applied in these fields due to its structural and chemical properties such as oxygen storage capacity, high surface area, thermal stability, high hardness index and its reactivity [9].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Nanocrystalline Cerium (IV) Oxide and Doped Cerium (IV) Oxide, Ce1-x-yMgxZryO2-?

Debnath

Tashmim

Rüscher³

et al. 2015

J. Sci. Res.

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Nanocrystalline cerium (IV) oxide is a technologically important material due to its high oxygen storage capacity, oxygen ionic conductivity and thermal stability. In this paper we report preparation of nanocrystalline CeO 2 using glycerin nitrate method, where the precursor obtained from the mixture of cerium nitrate and glycerin were calcined at temperatures ranging from 200°C to 800°C in steps of 100°C in a muffle furnace. Attempts were also made to prepare nanocrystalline cerium (IV) oxide doped with both Mg and Zr using the same method. The calcined specimens were characterized using XRD, FTIR and SEM/EDX analyses. The influence of the calcination temperature on the cubic phase formation and its consequent effect on the crystallite size of the prepared CeO 2 were studied and interpreted. The crystallite sizes calculated from XRD data using Scherrer formula reveal that the phases are nanocrystals, which was further supported by SEM photograph. The apparent activation energy for crystalline coarsening is found to be very low ) for this precursor compared to reported data. XRD data and also EDX analysis shows that both Mg and Zr could also be doped in CeO 2 upto a certain composition, Ce 1-x-y Mg x Zr y O 2-δ (x = 0.05, y = 0.05).

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“…Ceria i.e. cerium dioxide (CeO 2 ) has received more attention in recent years due to many distinctive characteristics, such as unique ultraviolet radiation absorbing ability [4], high stability at higher temperature, high hardness index and its reactivity [5]. However, CeO 2 is generally not considered as a photoactive material [6].…”

Section: Introductionmentioning

confidence: 99%

Ultrasound and Conventional Synthesis of Ceo2/Zno Nanocomposites and Their Application in the Photocatalytic Degradation of Rhodamine B Dye

Shah¹,

Bhangaonkar²,

Pinjari³

et al. 2017

JAN

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Abstract. CeO 2 /ZnO composite nanoparticles are synthesized by using in-situ precipitation method, without any stabilizers, via conventional i.e. non-ultrasound (NUS) and ultrasound-assisted processing technique (US). The structure, morphology, particle size and % weight loss of the synthesized nanoparticles were analyzed by using X-ray powder diffraction (XRD), Thermogravimetric Analysis (TGA), Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) to establish the formation of core shell type nanomaterials with an average particle size under 15 nm. The effectiveness of the synthesized core shell morphology of CeO 2 /ZnO (catalyst) for the photocatalytic degradation of Rhodamine B (RhB) dye has also been investigated. It has been observed that the catalysts prepared by sonochemical method exhibit higher photocatalytic activity as compared to the catalysts prepared by the conventional method. It was also found that the ultrasound-assisted technique is an energy efficient method as it saves more than 80% of energy along with a substantial reduction in reaction time, as compared to conventional synthesis technique.

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Origin of the Blue Shift in Ultraviolet Absorption Spectra of Nanocrystalline CeO<SUB>2−<I>x</I></SUB> Particles

Cited by 110 publications

References 20 publications

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

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

Preparation and Characterization of Nanocrystalline Cerium (IV) Oxide and Doped Cerium (IV) Oxide, Ce<sub>1-x-y</sub>Mg<sub>x</sub>Zr<sub>y</sub>O<sub>2-?</sub>

Ultrasound and Conventional Synthesis of Ceo<sub>2</sub>/Zno Nanocomposites and Their Application in the Photocatalytic Degradation of Rhodamine B Dye

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