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Probing confined acoustic phonons in free standing small gold nanoparticles
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Image of FIG. 1.
FIG. 1.

(a)-(c) TEM images of samples A, B, and C. The inset shows the size distribution histogram of the gold NCs determined by TEM analysis and the corresponding lognormal distribution fitting curve. (d) The interference fringes from lattice, with scale bar 2 nm and inset showing the electron diffraction pattern for sample C.

Image of FIG. 2.
FIG. 2.

Experimental UV-visible spectra for samples A, B, and C. The inset shows the dynamic light scattering spectra for samples A, B, and C.

Image of FIG. 3.
FIG. 3.

(a)-(c) Low frequency Raman spectra with 514 nm laser line of Au nanoparticle: (a) diameter d = 3.2 nm (sample A), (b) diameter d = 4.8 nm (sample B), (c) diameter d = 6.8 nm (sample C). The upper and lower panels of figure present VV and VH spectra, respectively.

Image of FIG. 4.
FIG. 4.

Peak frequencies of Raman spectra as a function of inverse particle diameter.

Image of FIG. 5.
FIG. 5.

Dependence of the full width at half maximum (FWHM) on 1/R of the l = 0 and l = 2, n = 0 spheroidal phonon modes.


Generic image for table
Table I.

Acoustic phonon frequencies for samples A, B, and C from low-frequency Raman scattering and Lamb's model. Values in bracket show the experimental value of low frequency Raman in HV arrangement. The slight change in the experimental value of HV spectrum may be attributed due to the scattered data, i.e., high signal to noise ratio.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Probing confined acoustic phonons in free standing small gold nanoparticles