کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5373106 | 1504203 | 2015 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Breathing Raman modes in Ag2S nanoparticles obtained from F9 zeolite matrix Breathing Raman modes in Ag2S nanoparticles obtained from F9 zeolite matrix](/preview/png/5373106.png)
- Raman breathing modes in small silver sulfide nanoparticles.
- Low energy (AgS)n clusters.
- Vibrational spectra predicted by DFT.
- Zeolite synthesis for small nanoparticles.
Ag2S nanoparticles were synthesized with a combination of synthetic F9, silver nitrate (AgNO3) and monohydrated sodium sulfide (Na2S9H2O). An ionic exchange was achieved via hydrothermal reaction. Nanoparticles with a predominant size ranging from 2 to 3 nm were obtained through Transmission Electron Microscopy (TEM). The nanoparticles feature a phase P21/n (14) monoclinic structure. A Raman band can be observed at around 250 cmâ1 in the nanoparticles. Furthermore, the vibrational properties and stability parameters of the clusters (AgS)n, (with n = 2-9) were studied by the Density Functional Theory (DFT). The approximation levels used with DFT were: Local Spin Density Approximation (LSDA) and Becke's three-parameter and the gradient corrected functional of Lee, Yang and Puar (B3LYP) in combination with the basis set LANL2DZ (the effective core potentials and associated double-zeta valence). The Radial Breathing Mode (RBM) for B3LYP was found between 227 and 295 cmâ1 as well as in longer wavelengths for LSDA.
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Journal: Chemical Physics - Volume 463, 16 December 2015, Pages 106-110