Tailoring surface enhanced Raman scattering platform based on pulsed laser deposited MoS2 - Ag hybrid nanostructure

Anju, K. S.; Midhun, P.S.; Kumar, K. Rajeev; Jayaraj, M. K.

doi:10.1016/j.matchemphys.2021.125286

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…Thus, this plasma exciton coupling can speed up electrons and holes with a low-energy shift and bind in electromagnetic fields, while inhibiting the carriers with high-energy recombination. In summary, strong plasmonic electromagnetic fields generated by metal can considerably improve the neighboring semiconductors interband transition rate and promote photogenerated carrier separation. − The FDTD simulation reveals that the strong plasmonic electromagnetic field generated by metal can greatly enhance the band transition rate of neighboring semiconductor materials. This effect is crucial for the performance of PEC devices and optoelectronic applications because it facilitates the photogenerated electron–hole pairs’ effective separation.…”

Section: Resultsmentioning

confidence: 98%

Photogenerated Carrier Separation and Localized Surface Plasmon Resonance in MoS₂/Metal Nanocomposites: Implications for Photoelectric Devices

Shi,

Li,

Cao

et al. 2024

ACS Appl. Nano Mater.

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Integrating noble metals with semiconductors is a viable approach to enhancing the photoelectric conversion efficiency of samples. The combination of metals with semiconductors has found widespread application in the field of optoelectronics and devices. Herein, metal (M = Ag/Cu) and MoS 2 (MoS 2 /M) nanocomposites were successfully synthesized using magnetron sputtering and hydrothermal two-step methods. The sizes and morphologies of the metals can be adjusted by controlling the sputtering time. Metals Ag and Cu were anchored onto defective MoS 2 nanomaterials, serving as photoanodes and light absorbers, respectively. The vacancy-induced defect structure, along with the synergistic effect of the interface and size, can simultaneously regulate the charge-carrier dynamics and the band structure of MoS 2 /M nanocomposites. The transient photocurrent responses and the electrochemical impedance spectroscopy results demonstrate the excellent photoelectrochemical (PEC) properties of the MoS 2 /M nanocomposites. A finite-difference timedomain simulation reveals that the strong plasmonic electromagnetic field generated by metal can significantly enhance the energyband transition rate of neighboring materials and improve photogenerated carrier separation. Compared with pure MoS 2 , MoS 2 /M nanocomposites exhibit enhanced nonlinear-optical (NLO) behavior. This improvement stems from an effective charge separation, which is facilitated by a synergistic interaction between the electric field and the plasmonic magnetic field. Density functional theory calculations indicate a decrease in the energy of the Mo d orbital, which contributes to the acceptance of d electrons from Ag/Cu. The exceptional performance of MoS 2 /M nanocomposites is primarily attributed to the occupancy of Mo d orbitals, driven by the intense interaction among MoS 2 and Ag/Cu optimal combination. This work offers valuable insights into the design of heterojunctions with abundant surface/interface contact and defect features to enhance tunable electron-transfer kinetics. Such advancements pave the way for achieving a high NLO conversion efficiency and the development of efficient PEC anode materials.

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Section: Resultsmentioning

confidence: 98%

Photogenerated Carrier Separation and Localized Surface Plasmon Resonance in MoS₂/Metal Nanocomposites: Implications for Photoelectric Devices

Shi,

Li,

Cao

et al. 2024

ACS Appl. Nano Mater.

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“…Recently, few reports have been published reporting the exemplary SERS performance and detection with the MoS 2 /metal composite substrates taking advantage of EM and chemical enhancement. , For example, Anju et al and Fang et al have successfully synthesized the MoS 2 /Ag composites and have achieved detection limits up to 10 –12 and 10 –14 M for R6G and Malachite green dyes. , Nanosensors based on MoS 2 and its nanocomposites have also been used to detect harmful chemicals and biomarkers for many life-threatening diseases. , For example, MoS 2 -based electrochemical sensors, , fluorescence resonance energy transfer sensors,and SERS-based sensors are widely reported. In a recent study, a voltammetric biosensor has been developed from the composite of MoS 2 with Si 3 N 4 and multiwalled carbon nanotubes for the detection of CYFRA 21-1 .…”

Section: Introductionmentioning

confidence: 99%

MoS₂–Ag Nanocomposite-Based SERS Substrates with an Ultralow Detection Limit

Kaushik

Singh

Soni

et al. 2023

ACS Appl. Nano Mater.

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Two-dimensional (2D) materials have been found to work efficiently for surface-enhanced Raman spectroscopy (SERS) owing to their electronic properties, tunable band gap, and layered structure with high absorption power. In this work, we have synthesized different morphologies of the MoS2, including the flower, interconnected nanoplates, and sheets, by the facile hydrothermal method to explore their morphological dependence for SERS application. The SERS substrate prepared with the nanoplate morphology MoS2 structures shows excellent detection up to 10–9 M concentration of rhodamine B (RhB) dye. RhB dye has genotoxic and carcinogenic effects on human as well as aquatic life, and it is illegally used as a food adulterant despite the prohibition. Thus, sensitive detection of RhB even at low concentrations is highly desired. MoS2 nanoplates have been functionalized with Ag nanoparticles (NPs) to optimize the MoS2 SERS performance. The MoS2–Ag nanocomposite SERS substrates successfully detect an ultralow concentration of 10–15 M of RhB dye with an enhancement factor of 9.2 × 107. A charge transfer mechanism between RhB molecules and MoS2 is proposed along with the contribution of Ag NPs in ultralow SERS detection.

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Photochemical decoration of gold nanoparticles on MoS2 nanoflowers grafted onto the flexible carbon cloth as a recyclable SERS sensor for the detection of antibiotic residues on curved surfaces

Barveen,

Chinnapaiyan,

Wang

et al. 2024

Chemosphere

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Tailoring surface enhanced Raman scattering platform based on pulsed laser deposited MoS2 - Ag hybrid nanostructure

Cited by 5 publications

References 32 publications

Photogenerated Carrier Separation and Localized Surface Plasmon Resonance in MoS₂/Metal Nanocomposites: Implications for Photoelectric Devices

Photogenerated Carrier Separation and Localized Surface Plasmon Resonance in MoS₂/Metal Nanocomposites: Implications for Photoelectric Devices

MoS₂–Ag Nanocomposite-Based SERS Substrates with an Ultralow Detection Limit

Photochemical decoration of gold nanoparticles on MoS2 nanoflowers grafted onto the flexible carbon cloth as a recyclable SERS sensor for the detection of antibiotic residues on curved surfaces

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Tailoring surface enhanced Raman scattering platform based on pulsed laser deposited MoS2 - Ag hybrid nanostructure

Cited by 5 publications

References 32 publications

Photogenerated Carrier Separation and Localized Surface Plasmon Resonance in MoS2/Metal Nanocomposites: Implications for Photoelectric Devices

Photogenerated Carrier Separation and Localized Surface Plasmon Resonance in MoS2/Metal Nanocomposites: Implications for Photoelectric Devices

MoS2–Ag Nanocomposite-Based SERS Substrates with an Ultralow Detection Limit

Photochemical decoration of gold nanoparticles on MoS2 nanoflowers grafted onto the flexible carbon cloth as a recyclable SERS sensor for the detection of antibiotic residues on curved surfaces

Contact Info

Product

Resources

About

Photogenerated Carrier Separation and Localized Surface Plasmon Resonance in MoS₂/Metal Nanocomposites: Implications for Photoelectric Devices

Photogenerated Carrier Separation and Localized Surface Plasmon Resonance in MoS₂/Metal Nanocomposites: Implications for Photoelectric Devices

MoS₂–Ag Nanocomposite-Based SERS Substrates with an Ultralow Detection Limit