MoS₂/Carbon Nanotube Core–Shell Nanocomposites for Enhanced Nonlinear Optical Performance

Abstract

Nanocomposites of layered MoS and multi-walled carbon nanotubes (CNTs) with core-shell structure were prepared by a simple solvothermal method. The formation of MoS nanosheets on the surface of coaxial CNTs has been confirmed by scanning electron microscopy, transmission electron microscopy, absorption spectrum, Raman spectroscopy, and X-ray photoelectron spectroscopy. Enhanced third-order nonlinear optical performances were observed for both femtosecond and nanosecond laser pulses over a broad wavelength range from the visible to the near infrared, compared to those of MoS and CNTs alone. The enhancement can be ascribed to the strong coupling effect and the photoinduced charge transfer between MoS and CNTs. This work affords an efficient way to fabricate novel CNTs based nanocomposites for enhanced nonlinear light-matter interaction. The versatile nonlinear properties imply a huge potential of the nanocomposites in the development of nanophotonic devices, such as mode-lockers, optical limiters, or optical switches.

Band Alignment of MoTe2/MoS2 Nanocomposite Films for Enhanced Nonlinear Optical Performance

“…The NLO property of heterostructures based on 2D layered materials is very significant for the nonlinear photonic devices such as optical switch, [14] mode locking laser, [15] optical limiter, [16] and logical circuit. [19] We reported that the nonlinear absorption coefficient of MoS 2 /graphene film is ≈−1217.8 cm GW −1 , which is larger than that of MoS 2 film (≈−136.1 cm GW −1 ) and graphene film (≈−961.6 cm GW −1 ) at the same condition. Li et al reported the nonlinear absorption coefficient (α NL ) of graphene/WS 2 heterostructure (9.7 × 10 4 cm GW −1 ), which is much higher than that of WS 2 (1.33 × 10 3 cm GW −1 ).…”

Q-switching of waveguide lasers based on graphene/WS_2 van der Waals heterostructure

“…It is worth noting that the linear absorption and thickness of the as-prepared heterostructure (∼2.23 nm), WS 2 (0.8 nm), and graphene (0.4 nm) also have been taken into account in the calculation by employing the UV-Vis spectrophotometer and atomic force microscopy, in which the graphene∕WS 2 heterostructure exhibited an enhanced linear absorption. By fitting the Z -scan data using the nonlinear absorption model [44,45], the heterostructure exhibited stronger nonlinear optical response with the combination of saturable absorption and multiphoton absorption. The fitted saturable intensity of graphene∕WS 2 heterostructure was 4.72 GW∕cm 2 and the nonlinear absorption coefficient (β) is measured to be 9.7 × 10 4 cm∕GW, which is much higher than 1.33 × 10 3 cm∕GW of WS 2 , which is within a reasonable range under the same condition [43].…”

Hierarchical MoS2/Carbon Composite Microspheres as Advanced Anodes for Lithium/Sodium‐Ion Batteries

“…[16,17] However,t he application of MoS 2 anodes suffers from several problems: 1) poor rate capability arising from its low electrical conductivity;2 )rapid capacity decay due to pulverization and restacking of MoS 2 nanosheets;3 )unsatisfactory cycling life owing to the shuttlee ffect of polysulfides and loss of active materials during charge/discharge. Construction of nanostructured MoS 2 materials, such as nanosheets, [20] nanofibers, [21,22] microflowers, [23] and nanospheres, [24,25] is considered to be an effective approach for facilitating the fast transfer of ions and thus enhancing the electrochemical performance. Construction of nanostructured MoS 2 materials, such as nanosheets, [20] nanofibers, [21,22] microflowers, [23] and nanospheres, [24,25] is considered to be an effective approach for facilitating the fast transfer of ions and thus enhancing the electrochemical performance.…”

“…[18,19] Therefore, novel strategies for developing advanced MoS 2based anode materials are highly desirable. Construction of nanostructured MoS 2 materials, such as nanosheets, [20] nanofibers, [21,22] microflowers, [23] and nanospheres, [24,25] is considered to be an effective approach for facilitating the fast transfer of ions and thus enhancing the electrochemical performance. On the other hand, combining MoS 2 with conductive materials such as carbon or conductive polymers effectively improves the electricalc onductivity and structural integrity.…”