Controlling the Crystallinity and Morphology of Bismuth Selenide via Electrochemical Exfoliation for Tailored Reverse Saturable Absorption and Optical Limiting

Controlling the Crystallinity and Morphology of Bismuth Selenide via Electrochemical Exfoliation for Tailored Reverse Saturable Absorption and Optical Limiting

As an emerging two-dimensional (2D) Group-VA material, bismuth selenide (Bi<sub>2</sub>Se<sub>3</sub>) exhibits favorable electrical and optical properties. Here, three distinct morphologies of Bi<sub>2</sub>Se<sub>3</sub> were obtained from bulk Bi<...

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Bibliographic Details
Main Authors:	Hao Yan, Bingxue Li, Junjie Pan, Xuan Fang, Yongji Yu, Dengkui Wang, Dan Fang, Yanyan Zhan, Xiaohua Wang, Jinhua Li, Xiaohui Ma, Guangyong Jin
Format:	Article
Language:	English
Published:	MDPI AG 2024-12-01
Series:	Nanomaterials
Subjects:	Bi<sub>2</sub>Se<sub>3</sub> electrochemistry nonlinear optical absorption reverse saturable absorption OA Z-scan technique
Online Access:	https://www.mdpi.com/2079-4991/15/1/52
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Summary:	As an emerging two-dimensional (2D) Group-VA material, bismuth selenide (Bi<sub>2</sub>Se<sub>3</sub>) exhibits favorable electrical and optical properties. Here, three distinct morphologies of Bi<sub>2</sub>Se<sub>3</sub> were obtained from bulk Bi<sub>2</sub>Se<sub>3</sub> through electrochemical intercalation exfoliation. And the morphologies of these nanostructures can be tuned by adjusting solvent polarity during exfoliation. Then, the nonlinear optical and absorption characteristics of the Bi<sub>2</sub>Se<sub>3</sub> samples with different morphologies were investigated using open-aperture Z-scan technology. The results reveal that the particle structure of Bi<sub>2</sub>Se<sub>3</sub> exhibits stronger reverse saturable absorption (RSA) than the sheet-like structure. This is attributed to the higher degree of oxidation and greater number of localized defect states in the particle structure than in the sheet-like structure. Electrons in these defect states can be excited to higher energy levels, thereby triggering excited-state and two-photon absorption, which strengthen RSA. Finally, with increasing the RSA, the optical limiting threshold of 2D Bi<sub>2</sub>Se<sub>3</sub> can also be increased. This work expands the potential applications of 2D Bi<sub>2</sub>Se<sub>3</sub> materials in the field of broadband nonlinear photonics.
ISSN:	2079-4991