Synthesis and properties of nanocrystalline π-SnS – a new cubic phase of tin sulphide
| Autor: | Ran E. Abutbul, Yuval Golan, Elad Segev, Leila Zeiri, Vladimir Ezersky, Guy Makov |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Absorption spectroscopy Band gap General Chemical Engineering chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences symbols.namesake Crystallography Lattice constant chemistry Phase (matter) symbols Physical chemistry Direct and indirect band gaps Density functional theory 0210 nano-technology Tin Raman spectroscopy |
| Zdroj: | RSC Advances. 6:5848-5855 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c5ra23092f |
| Popis: | We report on the synthesis of the newly discovered cubic phase of tin sulfide π-SnS and compare its properties to the well-known phase of tin sulfide, α-SnS. Shape control was achieved by the variation of synthesis parameters, resulting in cubic, rhombic dodecahedral and tetrahedral shapes of the π-SnS nanoparticles. X-ray diffraction provided authentication of the proposed model and refined determination of the lattice parameter a = 11.595 A. Raman spectroscopy showed a substantial shift towards higher energies and peak splitting for π-SnS. Optical absorption spectroscopy indicated an indirect band gap of 1.53 eV, in good agreement with density functional theory (DFT) calculations indicating a band gap greater than that of α-SnS. DFT total energy calculations show that the π-SnS phase is energetically similar to α-SnS, and is significantly more stable than the hypothetical ideal rocksalt structure of SnS. |
| Databáze: | OpenAIRE |
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