Self-assembled MoS<sub>2</sub>/rGO nanocomposites with tunable UV-IR absorption

Wang, Wei; Kapitanova, Olesya O.; Ilanchezhiyan, P.; Xi, Sixing; Panin, G. N.; Fu, Dejun; Kang, Tae Won

doi:10.1039/c7ra12455d

Cited by 22 publications

(9 citation statements)

References 46 publications

(31 reference statements)

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“…This red shift was attributed to the presence of semiconductor SnO 2 nanoparticles on the graphene sheet. It is interesting to note that in the case of SnO 2 /G nanocomposites, the peak at 280 nm associated with graphene red-shifts to 285 nm gradually with increasing centrifugation rate, indicating an increase in the π-electron concentration with reduction of sp 3 graphene oxide to sp 2 -hybridization of carbon atoms [ 47 ]. For a smaller size of nanocrystals, the self-assembly process results in a more efficient reduction of graphene due to possible charge transfer in SnO 2 /G nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

A facile hydrothermal approach for catalytic and optical behavior of tin oxide- graphene (SnO2/G) nanocomposite

et al. 2018

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A cost-effective, facile hydrothermal approach was made for the synthesis of SnO2/graphene (Gr) nano-composites. XRD diffraction spectra clearly confirmed the presence of tetragonal crystal system of SnO2 which was maintaining its structure in both pure and composite materials’ matrix. The stretching and bending vibrations of the functional groups were analyzed using FTIR analysis. FESEM images illustrated the surface morphology and the texture of the synthesized sample. HRTEM images confirmed the deposition of SnO2 nanoparticles over the surface of graphene nano-sheets. Raman Spectroscopic analysis was carried out to confirm the in-plane blending of SnO2 and graphene inside the composite matrix. The photocatalytic performance of the synthesized sample under UV irradiation using methylene blue dye was observed. Incorporation of grapheme into the SnO2 sample had increased the photocatalytic activity compared with the pure SnO2 sample. The electrochemical property of the synthesized sample was evaluated.

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Section: Resultsmentioning

confidence: 99%

A facile hydrothermal approach for catalytic and optical behavior of tin oxide- graphene (SnO2/G) nanocomposite

et al. 2018

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“…The EIS curves of MoS2/C, canXC-72R in 0.1 M KOH/0.1 M HClO4 electrolyte are revealed in Fig S5, MoS2/C, MoS2, and VulcanXC-72R all exhibit obvious sem high-frequency region. It is generally believed that the result of the hig icircle diameter is equal to the charge transfer resistance (Rct) [30]. In media, the Rct of MoS2/C composite is both obviously smaller than t VulcanXC-72R.…”

Section: Resultsmentioning

confidence: 99%

“…In Figure S5, MoS 2 /C, MoS 2 , and VulcanXC-72R all exhibit obvious semicircles in the high-frequency region. It is generally believed that the result of the high frequency semicircle diameter is equal to the charge transfer resistance (Rct) [30]. In the base or acid media, the Rct of MoS 2 /C composite is both obviously smaller than that of MoS 2 /C or VulcanXC-72R.…”

Section: Resultsmentioning

confidence: 99%

Green Synthesis of Flowerball-like MoS2/VC Nanocomposite and Its Efficient Catalytic Performance for Oxygen Reduction Either in Alkaline or Acid Media

Zhang

Wang

et al. 2022

Catalysts

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Opening up electrocatalysts for oxygen reduction reaction (ORR) is essential for practical application in fuel cells and metal-air batteries; however, how to make the catalysts with both good performance and low cost is difficult. Recently, research on the ORR of molybdenum disulfide-based catalysts in alkaline electrolytes has been on the rise. However, the development of MoS2 catalyst for acidic ORR is still in its infancy. Herein, without using reductant and morphology control reagent, we firstly obtained flowerball-like MoS2/Vulcan XC-72R (VC) nanocomposites via hydrothermal method. The designed composite exhibits a nearly 4e− ORR process with 0.78 and 0.92 V onset potentials in 0.1 M KOH and HClO4, respectively. Furthermore, the flowerball-like composite shows utmost electrochemical stability judging by 87 and 80% current retention for about 5.5 h either in alkaline or acid media, long term durability for continuous 10,000 cycles, and stronger resistance to methanol than the commercial Pt/C catalyst. The abundant Mo edges as catalytic active centers of flowerball-like structure, high electron conductivity, and enhanced mass transport in either alkaline or acidic electrolyte are favorable for catalytic performance. The prepared catalyst provides great potential for the substitution of noble metal based catalysts in fuel cells and metal-air batteries.

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“…The absorption maximum for all the samples was observed at 265 nm. The proximity of the C exciton (denotes the fast intraband transition of photoexcited electrons in the equispaced valence and conduction bands in the Brillouin zone) in MoS 2 , SPR in Ag, and π–π* transition of rGO has resulted in an overlap of multiple peaks and an increased peak intensity in the UV region . Here, sp 2 carbon atoms in rGO might have undergone the restoration of an extensive conjugated framework, attributed to the π–π* transitions of aromatic C–C bonds.…”

Section: Materials Characterizationmentioning

confidence: 99%

Genuine Two-Photon Absorption and Optical Limiting Property of the Ag–rGO–MoS₂ Hybrid: Implications for Laser Safety Devices

T. C.,

2024

ACS Appl. Nano Mater.

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With the extensive use of lasers for a variety of applications in day-to-day life, the need for optical limiters is driven by the importance of ensuring safety and maintaining the reliability and integrity of sensitive optical systems in various applications. Especially the nanosecond 532 nm laser is widely used in a large number of industrial applications, pertaining to the need of optical limiters for specifically attenuating the wavelength of the nanosecond green laser (typically operating at 532 nm). Advanced photonic materials comprising complex networks of metal–organic–inorganic Ag–rGO–MoS2 systems with varying concentrations of Ag (2.5, 5, 7.5, and 10 wt %) were developed, and their nonlinear absorption (NLA) is explored. Under Q-switched nanopulsed Nd:YAG laser (532 nm, 9 ns, 10 Hz) excitation, the hydrothermally synthesized hybrid system exhibited reverse saturable absorption, arising due to the two-photon absorption (2PA) process. The intensity-dependent Z-scan experiment and optical studies portray the existence of a genuine (simple and fast) 2PA mechanism in the hybrid, affirming the possibility of the utilization of the Ag–rGO–MoS2 hybrid for optical limiting applications. The Ag(7.5 wt %)–rGO–MoS2 hybrid showed a higher NLA coefficient of 9 × 10–10 m/W and a corresponding lower optical limiting threshold of 1 × 1012 W/m2. The hybrid exhibits strong absorption in the UV region due to the synergistic contribution of all the individual counter parts of the hybrid. The availability of multiple energy states near the 2PA state, the surface plasmon resonance-induced higher local field, and strong structural defects enhance the fast nonlinear response at nanosecond laser excitation. Thus, the exploration of the nonlinear optical behavior of Ag–rGO–MoS2 against 532 nm nanosecond laser pulses for laser safety applications is reported.

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Self-assembled MoS₂/rGO nanocomposites with tunable UV-IR absorption

Abstract: MoS2/rGO layered nanocomposites synthesized by hydrothermal process exhibit a wide UV-IR absorption in the wavelength range from 280 to 973 nm, which is attractive for highly efficient multiband solar cells and advanced photonics.

Cited by 22 publications

References 46 publications

A facile hydrothermal approach for catalytic and optical behavior of tin oxide- graphene (SnO2/G) nanocomposite

A facile hydrothermal approach for catalytic and optical behavior of tin oxide- graphene (SnO2/G) nanocomposite

Green Synthesis of Flowerball-like MoS2/VC Nanocomposite and Its Efficient Catalytic Performance for Oxygen Reduction Either in Alkaline or Acid Media

Genuine Two-Photon Absorption and Optical Limiting Property of the Ag–rGO–MoS₂ Hybrid: Implications for Laser Safety Devices

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Self-assembled MoS2/rGO nanocomposites with tunable UV-IR absorption

Abstract: MoS2/rGO layered nanocomposites synthesized by hydrothermal process exhibit a wide UV-IR absorption in the wavelength range from 280 to 973 nm, which is attractive for highly efficient multiband solar cells and advanced photonics.

Cited by 22 publications

References 46 publications

A facile hydrothermal approach for catalytic and optical behavior of tin oxide- graphene (SnO2/G) nanocomposite

A facile hydrothermal approach for catalytic and optical behavior of tin oxide- graphene (SnO2/G) nanocomposite

Green Synthesis of Flowerball-like MoS2/VC Nanocomposite and Its Efficient Catalytic Performance for Oxygen Reduction Either in Alkaline or Acid Media

Genuine Two-Photon Absorption and Optical Limiting Property of the Ag–rGO–MoS2 Hybrid: Implications for Laser Safety Devices

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Product

Resources

About

Self-assembled MoS₂/rGO nanocomposites with tunable UV-IR absorption

Genuine Two-Photon Absorption and Optical Limiting Property of the Ag–rGO–MoS₂ Hybrid: Implications for Laser Safety Devices