(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.
Experimental UV-visible spectra for samples A, B, and C. The inset shows the dynamic light scattering spectra for samples A, B, and C.
(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.
Peak frequencies of Raman spectra as a function of inverse particle diameter.
Dependence of the full width at half maximum (FWHM) on 1/R of the l = 0 and l = 2, n = 0 spheroidal phonon modes.
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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