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Wang YD, Wang YW, Dong YL, Zhou L, Kang JL et al. 2D Nb2CTx MXene/MoS2 heterostructure construction for nonlinear optical absorption modulation. Opto-Electron Adv 6, 220162 (2023). doi: 10.29026/oea.2023.220162
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Article Open Access
2D Nb2CTx MXene/MoS2 heterostructure construction for nonlinear optical absorption modulation
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Abstract
Two-dimensional (2D) nonlinear optical mediums with high and tunable light modulation capability can significantly stimulate the development of ultrathin, compact, and integrated optoelectronics devices and photonic elements. 2D carbides and nitrides of transition metals (MXenes) are a new class of 2D materials with excellent intrinsic and strong light-matter interaction characteristics. However, the current understanding of their photo-physical properties and strategies for improving optical performance is insufficient. To address this issue, we rationally designed andin situsynthesized a 2D Nb2C/MoS2 heterostructure that outperforms pristine Nb2C in both linear and nonlinear optical performance. Excellent agreement between experimental and theoretical results demonstrated that the Nb2C/MoS2 inherited the preponderance of Nb2C and MoS2 in absorption at different wavelengths, resulting in the broadband enhanced optical absorption characteristics. In addition to linear optical modulation, we also achieved stronger near infrared nonlinear optical modulation, with a nonlinear absorption coefficient of Nb2C/MoS2 being more than two times that of the pristine Nb2C. These results were supported by the band alinement model which was determined by the X-ray photoelectron spectroscopy (XPS) experiment and first-principal theory calculation. The presented facile synthesis approach and robust light modulation strategy pave the way for broadband optoelectronic devices and optical modulators. -
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References
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Supplementary information for 2D Nb2CTx MXene/MoS2 heterostructure construction for nonlinear optical absorption modulation 
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Wang YD, Wang YW, Dong YL, Zhou L, Kang JL et al. 2D Nb2CTx MXene/MoS2 heterostructure construction for nonlinear optical absorption modulation. Opto-Electron Adv 6, 220162 (2023). doi: 10.29026/oea.2023.220162
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Figure 1.
Characterization of the Nb2C/MoS2 heterostructure. (a) Schematic illustration of the in situ synthesis of the Nb2C/MoS2. (b) Transmission electron microscope (TEM) image of Nb2C/MoS2. (c) Elemental mapping images of Nb2C/MoS2, upper left plane: Nb (yellow), upper right plane: Mo (cyan), left lower plane: S (blue), and right lower plane Merge. (d) High-resolution transmission electron microscopy (HRTEM) of Nb2C/MoS2. (e) Selected area electron diffraction (SAED) pattern of Nb2C/MoS2. (f) Raman spectra of Nb2C/MoS2. (g) XRD pattern of Nb2C/MoS2, Nb2C, and Nb2AlC.
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Figure 2.
XPS spectra of the Nb2C/MoS2 and Nb2C: (a) C 1s, (b) Nb 3d, (c) O 1s, (d) S 2p, (e) F 1s, and (f) valence band.
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Figure 3.
The calculated work functions of (a) Nb2CF2/MoS2, (b) Nb2CO2/MoS2, (c) Nb2C(OH)2/MoS2. The charge-transfer and band alinement diagram of (d) Nb2CO2/MoS2 and (e) Nb2C(OH)2/MoS2.
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Figure 4.
(a) UV-vis spectrum of Nb2C solution with different concentrations. Inset: absorbance as a function of concentration. (b) DFT calculated absorption spectrum of Nb2C with different terminations. (c) UV-vis spectrum of Nb2C/MoS2 solution. (d) DFT calculated absorption spectrum of Nb2C/MoS2 with different terminations.
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Figure 5.
OA Z-scan results of Nb2C/MoS2 and Nb2C with an excitation wavelength of (a) 1300 nm and (b) 1550 nm. The corresponding nonlinear transmittance curves under excitation optical intensity are shown in (c) and (d). (e) Histogram of Is and αNL. (f) Schematic diagram of the transfer process of photogenerated carriers and enhanced nonlinear absorption process in Nb2C/MoS2.
