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Raman spectroscopy characterization of titania nanoparticles produced by flame pyrolysis: The influence of size and stoichiometry
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10.1063/1.2061894
/content/aip/journal/jap/98/7/10.1063/1.2061894
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/7/10.1063/1.2061894

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the experimental setup for particle synthesis with the reactant delivery system, the diffusion flame reactor, the quenching nozzle, and the glass fiber filter.

Image of FIG. 2.
FIG. 2.

Raman spectrum of a commercially available (Aldrich) rutile-anatase micropowder mixture.

Image of FIG. 3.
FIG. 3.

Correlation between Raman peak ( mode) shift (a) and width (b) and crystal size of nanoparticles from Group .

Image of FIG. 4.
FIG. 4.

Comparison of Raman peak shift ( mode) for nanoparticles from Group , , , and .

Image of FIG. 5.
FIG. 5.

Comparison of Raman peak width ( mode) for nanoparticles from Group , , , and .

Image of FIG. 6.
FIG. 6.

Raman peak shift ( mode) for nanoparticles (group and ), showing the contribution of size confinement and substoichiometry effects.

Image of FIG. 7.
FIG. 7.

Contribution of substoichiometry to the Raman shift ( mode) of nanoparticles as a function of flow ratio.

Image of FIG. 8.
FIG. 8.

Dispersion curves used for the anatase mode in the phonon confinement model by Bersani et al. [solid line, Eq. (4), Ref. 18], by Ivanda et al. [dashed line, Eq. (5), Ref. 20], and in the current work [point line, Eq. (6)].

Image of FIG. 9.
FIG. 9.

Comparison between experimental data (Raman peak shift) and computed results of 3D, 2D, and 1D phonon confinement models presented in this work for nanoparticles (group ).

Image of FIG. 10.
FIG. 10.

Comparison between experimental data (Raman peak width) and computed results of 3D, 2D, and 1D phonon confinement models presented in this work for nanoparticles (group ).

Tables

Generic image for table
Table I.

Raman peaks shifts and mode assignments for the rutile an anatse phase, according to Refs. 9 and 12, respectively. (a) Rutile; (b) anatase.

Generic image for table
Table II.

Synthesis parameters and structural data for the titanium oxide nanoparticles analyzed in this work: burner-to-nozzle distance (BND), oxygen flow, TTIP flow, BET size, XRD size, and anatase fraction (as measured by XRD).

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/content/aip/journal/jap/98/7/10.1063/1.2061894
2005-10-05
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Raman spectroscopy characterization of titania nanoparticles produced by flame pyrolysis: The influence of size and stoichiometry
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/7/10.1063/1.2061894
10.1063/1.2061894
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