TY - JOUR
T1 - Raman and X-ray diffraction study of Ag–In–S polycrystals, films, and nanoparticles
AU - Solonenko, Dmytro
AU - Azhniuk, Yuriy M.
AU - Gomonnai, Alexander V.
AU - Loya, Vasyl
AU - Voynarovych, Ivan M.
AU - Lopushanska, Bohdana
AU - Roman, Ivan
AU - Lopushansky, Vasyl
AU - Zahn, Dietrich R. T.
PY - 2023/4/28
Y1 - 2023/4/28
N2 - A Raman and X-ray diffraction (XRD) study of AgInS2 and Ag-deficient Ag–In–S nanoparticles produced by colloidal synthesis is performed in comparison with polycrystals and thermally evaporated films of similar compositions. The tetragonal and cubic structures of AgInS2 and AgIn5S8 polycrystals as well as the amorphous structure of the films are confirmed by XRD. Average size of the Ag–In–S nanoparticles (~ 2 nm) is estimated from the Scherrer equation. The Raman spectra of AgInS2 and Ag-deficient Ag–In–S nanoparticles reveal significant broadening due to phonon confinement and the contributions of surface phonons. A strong similarity of the spectra of ultrasmall Ag–In–S nanoparticles prepared with various precursor ratios is explained by the fact that in this case the nanoparticle sulphur-rich chemical composition is determined by the high amount of sulphur atoms on the nanocrystal surface, which simultaneously belong to the glutathione capping ligands.
AB - A Raman and X-ray diffraction (XRD) study of AgInS2 and Ag-deficient Ag–In–S nanoparticles produced by colloidal synthesis is performed in comparison with polycrystals and thermally evaporated films of similar compositions. The tetragonal and cubic structures of AgInS2 and AgIn5S8 polycrystals as well as the amorphous structure of the films are confirmed by XRD. Average size of the Ag–In–S nanoparticles (~ 2 nm) is estimated from the Scherrer equation. The Raman spectra of AgInS2 and Ag-deficient Ag–In–S nanoparticles reveal significant broadening due to phonon confinement and the contributions of surface phonons. A strong similarity of the spectra of ultrasmall Ag–In–S nanoparticles prepared with various precursor ratios is explained by the fact that in this case the nanoparticle sulphur-rich chemical composition is determined by the high amount of sulphur atoms on the nanocrystal surface, which simultaneously belong to the glutathione capping ligands.
M3 - Article
SN - 0884-2914
VL - 38
SP - 2239
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 8
ER -