@article{Jiang2022, 
author = {Shaolong Jiang and Jin Yang and Liang Zhu and Jiafeng Xie and Weiteng Guo and Erding Zhao and Chaoyu Chen and Tianwu Wang and Fuhai Su and Yanfeng Zhang and Junhao Lin},
title = {Nonlinear electronic and ultrafast optical signatures in chemical vapor-deposited ultrathin PtS2 ribbons},
year = {2022},
journal = {Nano Research},
volume = {15},
number = {5},
pages = {4366-4373},
keywords = {chemical vapor deposition, saturable absorption, platinum disulfide (PtS2), electronic transition, optical pump-probe spectroscopy},
url = {https://www.sciopen.com/article/10.1007/s12274-022-4168-y},
doi = {10.1007/s12274-022-4168-y},
abstract = {The emerging two-dimensional (2D) platinum disulfide (PtS2) has driven increasing attentions due to its high electron mobility, good air-stability, and strong interlayer interaction which leads to a widely tunable electronic structure. However, a detailed study on its covalent-like layer-dependent properties remains infant. Herein, we demonstrate the successful production of ultrathin 1T-PtS2 ribbons with thickness centralized almost at monolayer 1L–4L and large domain size up to 210 µm on Au foils using chemical vapor deposition (CVD) technique, which enables macro- and microscopic study of its extraordinary layer-dependent features with precise control of the number of layers. Using electron energy loss spectroscopy (EELS) and optical pump-probe spectroscopy (OPPS), we reveal that both the electron and ultrafast optical absorption signals of the as-grown 2D PtS2 show strong nonlinear layer-dependent responses which manifest discriminated transition in 1L–4L PtS2 ribbons. The layer-dependent nonlinear response of 2D PtS2 can be well interpreted in the frame of calculated electron and phonon structures. These achievements offer a platform for successfully fabricating large-sized ultrathin 2D PtS2 and facilitating our knowledge about its electronic and optoelectronic properties.}
}