Raman Scattering Study of Cu3SnS4 Colloidal Nanocrystals

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• 作者：Volodymyr M. Dzhagan ; Alexander P. Litvinchuk ; Marta Kruszynska ; Joanna Kolny-Olesiak ; Mykhailo Ya. Valakh ; Dietrich R. T. Zahn
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：November 26, 2014
• 年：2014
• 卷：118
• 期：47
• 页码：27554-27558
• 全文大小：295K
• ISSN：1932-7455

文摘

We report the results of a Raman spectroscopy study of lattice vibrations in colloidal Cu₃SnS₄ nanocrystals (NCs) in a broad spectral range between 70 and 1200 cmp>鈥?p>. The crystallographic structure and lattice symmetry of NCs is confirmed by the X-ray diffraction data. The three most intensive Raman features in the spectra obtained in this work coincide with those previously reported for thin films of orthorhombic Cu₃SnS₄. Rather small scattering line widths indicate high structural perfection of the NCs. Along with the known modes of Cu₃SnS₄, several additional phonon peaks are observed for this compound in the frequency ranges not studied earlier, below 200 and between 500 and 1200 cmp>鈥?p>. All experimentally determined Raman bands are found to correlate well with the results of ab initio calculations of phonon frequencies in Cu₃SnS₄ of the orthorhombic modification (space group #31, Pmn2₁).