TY - JOUR
T1 - Structural, thermal, vibrational, and optical characterization of Sn–S–Se dichalcogenide system synthesized by high-energy ball milling
AU - de Oliveira Melquiades, Miécio
AU - Soares de Oliveira, Leonardo
AU - Angelo da Silva, Ranilson
AU - Michielon de Souza, Sérgio
AU - Orlandi, Marcelo Ornaghi
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021
Y1 - 2021
N2 - Layered tin-based SnS2, Sn(S0.5Se0.5)2, and SnSe2 dichalcogenide semiconductors were synthesized using high-energy ball milling. Structural analyses revealed anisotropic nanostructures with the 2H-polytype. The extended milling time produced nanocrystallites due to the high density of defects and texture indexes. A significant microstrain reduction was achieved by replacing the 1d site with heavier chalcogenides. The presence of microstrained nanocrystallites widens and redshifts the A1g and Eg Raman modes. The redshift effect also occurs when the lattice parameters are increased via doping. The overall exothermic DSC profile exhibited a subtle modification above 450 °C suggestive of SnO2 nucleation. A composition-dependent exciton redshift in UV–Vis was followed by a reduction in the band gap toward lower averaged ionic radii in the 1d site. Multiple straight-line segments in Tauc plots indicate sub-bands as a result of the multilayered structure.
AB - Layered tin-based SnS2, Sn(S0.5Se0.5)2, and SnSe2 dichalcogenide semiconductors were synthesized using high-energy ball milling. Structural analyses revealed anisotropic nanostructures with the 2H-polytype. The extended milling time produced nanocrystallites due to the high density of defects and texture indexes. A significant microstrain reduction was achieved by replacing the 1d site with heavier chalcogenides. The presence of microstrained nanocrystallites widens and redshifts the A1g and Eg Raman modes. The redshift effect also occurs when the lattice parameters are increased via doping. The overall exothermic DSC profile exhibited a subtle modification above 450 °C suggestive of SnO2 nucleation. A composition-dependent exciton redshift in UV–Vis was followed by a reduction in the band gap toward lower averaged ionic radii in the 1d site. Multiple straight-line segments in Tauc plots indicate sub-bands as a result of the multilayered structure.
KW - Differential scanning calorimetry
KW - High energy ball milling
KW - Raman spectroscopy
KW - Tin dichalcogenides
KW - UV–Vis
KW - X-ray diffraction
U2 - 10.1016/j.jpcs.2021.110203
DO - 10.1016/j.jpcs.2021.110203
M3 - Journal article
AN - SCOPUS:85107658434
SN - 0022-3697
VL - 157
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
M1 - 110203
ER -