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Damping of surface acoustic vibration induced by electrons trapped on nanocrystal surface
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View: Figures


Image of FIG. 1.
FIG. 1.

[(a)–(c)] TEM images of the NC powders prepared with reaction durations , 12, and 24 h for samples A, B, and C, respectively. The insets show the corresponding NC size distributions with center size and FWHM . (d) A typical HRTEM image of the powder sample produced with . NCs 1 and 2 show different separations between the lattice planes. The inset shows the ASED pattern which can be indexed to the rutile phase of .

Image of FIG. 2.
FIG. 2.

(a) Low-frequency Raman spectra of samples A, B, and C. (b) Low-frequency Raman spectra of sample B, acquired from five different polarization configurations (the angles between the incident and scattered light polarization directions from top to down are 0°, 22.5°, 45°, 67.5°, and 90°). The spectra are fitted using Lorentzian lineshape.

Image of FIG. 3.
FIG. 3.

Theoretical FWHM for the SPH mode (, ) vs NC diameter . Squares are the experimental data. The inset shows the dependence of the calculated peak position for spherical modes on inverse diameter. The asterisks represent the experimental data. The error bars represent the uncertainties in the experimental values.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Damping of surface acoustic vibration induced by electrons trapped on SnO2 nanocrystal surface