Tunable nonlinear optical responses and carrier dynamics of two-dimensional antimonene nanosheets
| Autor: | Tao-Tao Dong, Zi-Zhen Chen, Shah Fahad, Qi-Wei Song, Ze-Qi Zhang, Qiang Wang, Hao-Ran Wu, Xin-Ping Zhai, Li-Chuan Chen, Rui-Tong Liu, Xian Fei, Hao-Li Zhang, Xiang-Yang Li, Yong Peng, Zhe-Ji Wang, Chun-Lin Sun, Lei Zhang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry Exciton Relaxation (NMR) Saturable absorption 02 engineering and technology Nanosecond 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Exfoliation joint 0104 chemical sciences Ultrafast laser spectroscopy Optoelectronics General Materials Science 0210 nano-technology business Ultrashort pulse Nanosheet |
| Zdroj: | Nanoscale Horizons. 5:1420-1429 |
| ISSN: | 2055-6764 2055-6756 |
| Popis: | Sb nanosheets, also known as antimonene, have received ever-growing consideration as a promising new type of two-dimensional (2D) material due to their many attractive properties. However, how their nonlinear optical (NLO) properties are affected by their nanosheet structure and measurement conditions remains unclear. Herein, we report a successful size-selective production method for Sb nanosheets, which is based on a combination of lithium ion intercalation, solvent exfoliation and size selection centrifugation. This high-yield and size-selective preparation method enables fundamental investigation on the relation of the intrinsic optical properties of Sb nanosheets. Nanosecond Z-scan measurements revealed a unique size-dependent broadband NLO response. When the average size is reduced from 3 micrometers to 50 nanometers, the Sb nanosheets exhibit a clear transition from saturable absorption to reversed saturable absorption. Ultrafast transient absorption spectroscopic investigation indicated that exciton cooling is significantly faster in a small nanosheet than in large ones, revealing that the different exciton relaxation dynamic plays key roles in the distinct size-tunable nonlinear optical response. This work paves new ways towards the mass production and practical application of antimonene. |
| Databáze: | OpenAIRE |
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