Recently, Prof. Jun Wang from the Key Laboratory of Strong Laser Materials of the Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, made progress in the study of the third-order nonlinear optical properties of MoS2 / carbon nanotube nanocomposites with core-shell structure. Relevant research was published in the Chemistry A European Journal (Impact Factor 5.83) and was selected by the journal as the cover page.
The unique structure and nonlinear optical properties of 2D materials make these materials potentially useful in the fields of nanophotonics such as mode-locked, Q-switched, optical limiting, and optical switches. Two-dimensional transition metal sulfide (MX2, M = Mo, W, etc., X = S, Se, Te) due to its semiconductor properties and strong exciton binding effect, as well as the band gap dependence of the number of layers, The widespread concern. However, due to the non-linear optical properties of a single transition metal sulfide, it is still unable to meet the needs of the device, making the nonlinear optical properties of the material by forming heterostructures become hot spots.
In this work, MoS2 nanosheets were grown in-situ by one-step solvothermal method on one-dimensional carbon nanotubes (CNTs). The MoS2 / CNTs nanocomposites with core-shell structure were obtained. Linear light modulation behavior. The study found that for the femtosecond pulsed laser, due to the charge transfer, the nanocomposite allows the light to pass first, and then blocks the light transmission, showing the transition from saturated absorption to optical limiting. For the nanosecond pulsed laser, There is a strong thermal-induced non-linear scattering effect, which nanocomposite exhibits optical confinement behavior. Studies have shown that the third-order optical nonlinearity of the composite is significantly improved compared to a single MoS2 or carbon nanotube.
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