@Article{cl.2026.083268,
AUTHOR = {Yulong Lian, Ruiqiang Wang, Ziyan Ding, Jinyang Liu},
TITLE = {Mixed Salt-Assisted Growth of Large-Size Ultrathin SnS<sub>2</sub> Nanosheets and Their Anisotropy Study},
JOURNAL = {Chalcogenide Letters},
VOLUME = {},
YEAR = {},
NUMBER = {},
PAGES = {{pages}},
URL = {http://www.techscience.com/CL/online/detail/26873},
ISSN = {1584-8663},
ABSTRACT = {The morphological regularity, thickness uniformity, and size controllability of two-dimensional materials play a crucial role in regulating their physicochemical properties. However, achieving a synergistic balance among these three factors remains a key challenge in the field. In this study, through a systematic investigation of 36 salt-assisted growth systems, we discovered that CsCl promotes the lateral growth of SnS<sub>2</sub>, while KI optimizes the crystal morphology. Using a CsCl/KI mixed salt system, we successfully grew triangular, ultrathin, large-area SnS<sub>2</sub> nanosheets with a size exceeding 200 μm and a thickness of only 1.8 nm. Angle-resolved polarized Raman spectroscopy (ARPRS) revealed that SnS<sub>2</sub> nanosheets transferred onto SiO<sub>2</sub> substrates exhibit intrinsic in-plane isotropy. In contrast, SnS<sub>2</sub> nanosheets grown directly on mica substrates display a 90° periodic variation in Raman peak intensity with polarization angle, indicating significant in-plane anisotropy. This anisotropy arises from interfacial stress induced by lattice mismatch between the mica substrate and SnS<sub>2</sub>, which breaks the intrinsic symmetry of the material. In addition, the transition of SnS<sub>2</sub> nanosheets from in-plane optical isotropy to anisotropy were confirmed by the polarized optical microscopy characterization. These results demonstrate that the mixed salt-assisted growth strategy provides a new approach for synergistically controlling the size, shape and thickness of two-dimensional materials and offers a novel method for inducing anisotropic property in intrinsically isotropic two-dimensional materials through lattice mismatch.},
DOI = {10.32604/cl.2026.083268}
}