Tunable nonlinear optical responses and carrier dynamics of two-dimensional antimonene nanosheets

Lei Zhang; Shah Fahad; Hao-Ran Wu; Tao-Tao Dong; Zi-Zhen Chen; Ze-Qi Zhang; Rui-Tong Liu; Xin-Ping Zhai; Xiang-Yang Li; Xian Fei; Qi-Wei Song; Zhe-Ji Wang; Li-Chuan Chen; Chun-Lin Sun; Yong Peng; Qiang Wang; Hao-Li Zhang

doi:10.1039/D0NH00262C

Tunable nonlinear optical responses and carrier dynamics of two-dimensional antimonene nanosheets†

Lei Zhang,^a Shah Fahad,^b Hao-Ran Wu,^a Tao-Tao Dong,^a Zi-Zhen Chen,^a Ze-Qi Zhang,^a Rui-Tong Liu,^a Xin-Ping Zhai,^a Xiang-Yang Li,^a Xian Fei,^a Qi-Wei Song,^a Zhe-Ji Wang,^a Li-Chuan Chen,^a Chun-Lin Sun,^a Yong Peng,^b Qiang Wang

*^a and Hao-Li Zhang

*^ac

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* Corresponding authors

^a State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Special Function Materials and Structure Design (MOE), College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
E-mail: qiangwang@lzu.edu.cn, haoli.zhang@lzu.edu.cn

^b Key Laboratory of Magnetism and Magnetic Materials of Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, P. R. China

^c Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, P. R. China

Abstract

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.

Nanoscale Horizons

Tunable nonlinear optical responses and carrier dynamics of two-dimensional antimonene nanosheets†

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Tunable nonlinear optical responses and carrier dynamics of two-dimensional antimonene nanosheets

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