Spherical vibrational modes of ZrO2–CuO nanoparticles

Mikac, Lara; Ivanda, Mile; Štefanić, Goran; Musić, Svetozar; Furić, Krešimir; Tonejc, Antun

doi:10.1016/j.molstruc.2011.02.032

Cited by 2 publications

(7 citation statements)

References 31 publications

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“…For these reasons we attribute the main band at 40-50 cm À1 to the breathing vibration of the ZrO 2 nanocrystals. It is remarkably sharp when compared to previously reported measurements, 24,25,27 certainly due to the much lower nanocrystal size variation of our samples. The total quality factor Q dened as the ratio of the peak frequency to its full width at half maximum is about 4, which is signicantly higher than most spectra reported in the literature including previous measurements on ZrO 2 nanocrystals.…”

Section: Low-frequency Raman Studiessupporting

confidence: 47%

“…The most intense peaks are in the low-frequency range for all the samples investigated in this work, in agreement with previous measurements on ZrO 2 nanocrystals. 24,25 The inset of Fig. 1 shows the ngerprint region of the crystal lattice vibrations for all the samples studied.…”

Section: Chemical Structural and Morphological Characterizationmentioning

confidence: 99%

“…Such peaks have already been reported for ZrO 2 nanocrystals and are therefore expected in our samples. 24,25,27,29 But a careful analysis of the spectra is required in order to assign the lowfrequency peaks to conned vibrations without doubt.…”

Section: Low-frequency Raman Studiesmentioning

confidence: 99%

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THz nanocrystal acoustic vibrations from ZrO2 3D supercrystals

et al. 2013

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International audienceWe report sharp low-frequency Raman spectral features of supercrystals synthesized via the "benzyl alcohol route" and consisting of either yttrium-stabilized or pure zirconia (ZrO2) nanocrystals. In situ formed benzoate species control the nanocrystal growth and act as organic glue leading to the assembly of the nanocrystals in highly ordered 3D supercrystals. We attribute some Raman peaks to THz acoustic vibrations of individual nanocrystals which are only weakly coupled due to the strong acoustic mismatch between the capping ligands and the nanocrystals. Peak positions are consistent with nanocrystal sizes estimated from transmission electron microscopy and X-ray powder diffraction studies. Narrow size distribution, together with uniform morphological and structural features of the nanocrystals, leads to sharp Raman peaks in the THz spectral region. After removing the ligands by annealing, the acoustic vibrations of the nanocrystals couple resulting in an increase of their frequency. These findings suggest that 3D supercrystals of zirconia nanocrystals can be used for manipulating THz phonons

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Section: Low-frequency Raman Studiessupporting

confidence: 47%

Section: Chemical Structural and Morphological Characterizationmentioning

confidence: 99%

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THz nanocrystal acoustic vibrations from ZrO2 3D supercrystals

et al. 2013

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“…The peak positions of the most intense Raman peaks above 80 cm –1 are located at 103, 178, 189, 220, 309, 332, 345, 382, 478, 613, and 627 cm –1 and are in agreement with the monoclinic structure of ZrO 2 . , The tetragonal crystalline phase could not be evidenced from the Raman spectra. Two low-frequency Raman peaks can be clearly identified below 80 cm –1 in these raw spectra (no temperature correction).…”

Section: Resultsmentioning

confidence: 96%

“…Low-frequency Raman scattering has been used to determine the size of very small nanoparticles (less than ∼10–20 nm). In particular, the simple inverse size dependence of the frequency of the confined acoustic vibrations enables the determination of the size distribution of the nanoparticles using the shape of the low-frequency Raman peaks. − Recent works have revealed the richness of low-frequency Raman spectra for model materials because of the sensitivity to the size, shape, composition, and environment of the nanoparticles but also because the vibrations depend on the inner lattice structure. − In the present work, we attempt to clarify whether the broadening of the peaks is mainly due to the size distribution or whether the broadening due to the elastic anisotropy resulting from the crystalline structure of the nanoparticles plays a significant role.…”

Section: Introductionmentioning

confidence: 96%

Acoustic Vibrations of Monoclinic Zirconia Nanocrystals

2011

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Polarized low-frequency Raman spectra originating from confined acoustic vibrations are reported for monoclinic ZrO2 nanoparticles with a narrow size distribution synthesized from a continuous supercritical water process. The monoclinic lattice structure is taken into account for the interpretation of the spectra by comparing with isotropic and anisotropic continuum elasticity calculations for monodomain nanocrystals. The various mechanisms leading to the broadening of the Raman peaks are discussed. We demonstrate that an accurate determination of the size distribution of the nanoparticles is possible using the Raman peak due to the fundamental breathing vibration which is hardly broadened by the elastic anisotropy and the shape distribution.

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Spherical vibrational modes of ZrO2–CuO nanoparticles

Cited by 2 publications

References 31 publications

THz nanocrystal acoustic vibrations from ZrO2 3D supercrystals

THz nanocrystal acoustic vibrations from ZrO2 3D supercrystals

Acoustic Vibrations of Monoclinic Zirconia Nanocrystals

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