Revealing the anisotropic phonon behaviours of layered SnS by angle/temperature-dependent Raman spectroscopy.
Xiangnan GongTing YanJue LiJie LiuHanjun ZouBin ZhangHong WuZizhen ZhouXiaoyuan ZhouPublished in: RSC advances (2022)
Tin sulfide (SnS), a IV-VI group layered compound, has attracted much attention because of its excellent thermoelectric properties along the crystallographic b -axis. However, there are few reports on the identification of its in-plane orientation. We observe a strong anisotropy of the in-plane Raman signal in bulk SnS. With the help of ab initio calculations, the vibrational symmetry of each observed Raman mode in the cleaved (00 l )-plane is consistent with the experimental values. The angle-resolved polarized Raman spectroscopy, combined with electron backscattered diffraction technology, is utilized to systematically investigate the in-plane anisotropy of the phonon response and then determine the in-plane orientation. Furthermore, the temperature-dependent and laser-power-dependent Raman scattering analyses reveal that the adjacent layers in the SnS crystals show a relatively weak van der Waals interaction. These findings could provide much-needed experimental information for future applications related to the anisotropic transport properties of SnS single crystals.
Keyphrases
- raman spectroscopy
- high resolution
- highly efficient
- density functional theory
- working memory
- molecular dynamics simulations
- reduced graphene oxide
- molecular dynamics
- healthcare
- room temperature
- genome wide
- emergency department
- gene expression
- gold nanoparticles
- social media
- current status
- crystal structure
- drug induced
- electron microscopy
- finite element