One-step chemically vapor deposited hybrid 1T-MoS2/2H-MoS2 heterostructures towards methylene blue photodegradation

Mouloua, D.; Lejeune, M.; Rajput, Nitul S.; Kaja, Khaled; Marssi, M. El; Khakani, My Alì El; Jouiad, Mustapha

doi:10.1016/j.ultsonch.2023.106381

Cited by 13 publications

(7 citation statements)

References 59 publications

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“…Additionally, two peaks at 231.8 and 228.8 eV correspond to the Mo 3d 3/2 and 3d 5/2 states in metallic 1T-phase MoS 2 , respectively. Notably, the binding energies of 1T-phase were about 0.8 eV lower than those of 2H-phase overall . The S 2p spectrum (Figure e) also displays four characteristic peaks.…”

Section: Resultsmentioning

confidence: 98%

Construction of Hierarchical Yolk–Shell Co/N-Dope C@void@C@MoS₂ Composites with Multiple Heterogeneous Interfaces toward Broadband Electromagnetic Wave Absorption

Liu,

Wang,

Zhong

et al. 2024

ACS Appl. Mater. Interfaces

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The synthesis of materials with a multicomponent hierarchical structure is an essential strategy for achieving highperformance electromagnetic wave (EMW) absorption. However, conventional design strategies face challenges in terms of the rational construction of specific architecture. In this study, we employ a combined space-restricted and hierarchical construction strategy to surface-plant MoS 2 nanosheets on yolk−shell structural carbon-modified Co-based composites, leading to the development of high-performance Co/NC@void@C@MoS 2 absorbers with advanced architecture. The surface-planted MoS 2 nanosheets, the Co/NC magnetic yolk, and the dielectric carbon shell work together to enhance the impedance matching characteristics and synergistic loss capabilities in the composites. Experimental results indicate that Co/NC@void@C-700@MoS 2 exhibited the best absorption performance with an effective absorption bandwidth of 7.54 GHz (at 2.05 mm) and a minimum reflection loss of −60.88 dB (at 1.85 mm). Furthermore, radar cross-section simulation results demonstrate that Co/NC@void@C-700@MoS 2 effectively suppresses the scattering and transmission of EMWs on perfect electric conductor substrates, implying its superior practical application value. This study provides inspiration and experimental basis for designing and optimizing EMW absorption materials with hierarchical yolk−shell architecture.

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Section: Resultsmentioning

confidence: 98%

Construction of Hierarchical Yolk–Shell Co/N-Dope C@void@C@MoS₂ Composites with Multiple Heterogeneous Interfaces toward Broadband Electromagnetic Wave Absorption

Liu,

Wang,

Zhong

et al. 2024

ACS Appl. Mater. Interfaces

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“…Certainly, one can achieve the coexistence of phases by fine-tuning parameters, such as temperature, 88,120 pressure, 121,122 reducing atmosphere, 88 composition, 66,123 and catalysts. 69,90,124−126 Recently, there has been a surge in the emergence of various methods for achieving the coexistence of phases through CVD, including flux-controlled CVD for mixed-dimensional heterostructures, 127 single-step CVD for 1T/2H-MoS 2 heterostructures, 120 Sb 2 O 3 and NaCl-assisted CVD-yielded coexistingphase 1T/2H-MoS 2 , 69 and rhenium doping facilitated the controlled synthesis of 1T/2H-MoS 2 films. 125,126 The flexibility in tuning the parameters of CVD allows for the controlled preparation of coexisting phases in both lateral and vertical structures.…”

Section: Synthesis Methodology Of Coexisting Tmdcs Phasesmentioning

confidence: 99%

“…In the CVD process for the synthesis of coexisting TMDC phases, the key factors are temperature and gas flow for the control of the nucleation and growth rates of different phases. Certainly, one can achieve the coexistence of phases by fine-tuning parameters, such as temperature, , pressure, , reducing atmosphere, composition, , and catalysts. ,,− Recently, there has been a surge in the emergence of various methods for achieving the coexistence of phases through CVD, including flux-controlled CVD for mixed-dimensional heterostructures, single-step CVD for 1T/2H-MoS 2 heterostructures, Sb 2 O 3 and NaCl-assisted CVD-yielded coexisting-phase 1T/2H-MoS 2 , and rhenium doping facilitated the controlled synthesis of 1T/2H-MoS 2 films. , …”

Section: Synthesis Methodology Of Coexisting Tmdcs Phasesmentioning

confidence: 99%

Coexisting Phases in Transition Metal Dichalcogenides: Overview, Synthesis, Applications, and Prospects

Liu,

Wu,

et al. 2024

ACS Nano

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Over the past decade, significant advancements have been made in phase engineering of two-dimensional transition metal dichalcogenides (TMDCs), thereby allowing controlled synthesis of various phases of TMDCs and facile conversion between them. Recently, there has been emerging interest in TMDC coexisting phases, which contain multiple phases within one nanostructured TMDC. By taking advantage of the merits from the component phases, the coexisting phases offer enhanced performance in many aspects compared with single-phase TMDCs. Herein, this review article thoroughly expounds the latest progress and ongoing efforts on the syntheses, properties, and applications of TMDC coexisting phases. The introduction section overviews the main phases of TMDCs (2H, 3R, 1T, 1T′, 1T d ), along with the advantages of phase coexistence. The subsequent section focuses on the synthesis methods for coexisting phases of TMDCs, with particular attention to local patterning and random formations. Furthermore, on the basis of the versatile properties of TMDC coexisting phases, their applications in magnetism, valleytronics, field-effect transistors, memristors, and catalysis are discussed. Lastly, a perspective is presented on the future development, challenges, and potential opportunities of TMDC coexisting phases. This review aims to provide insights into the phase engineering of 2D materials for both scientific and engineering communities and contribute to further advancements in this emerging field.

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“…8−11 Among various fabrication processes, chemical vapor deposition (CVD) has emerged as the most accessible, cost-effective, and straightforward method for producing high-quality MoS 2 , 12−17 with diverse morphologies, including planar and vertical triangles, 18−21 nanowires, 22 and nanosheets. 23,24 This variety morphology enhances MoS 2 's light absorption and specific area, facilitating a larger contact interface between MoS 2 and the analyte. These unique characteristics have prompted studies exploring MoS 2 's optical sensing capabilities for detecting various contaminate dyes, such as rhodamine, 25 methylene blue (MB), 26 and methylene orange.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Consequently, shielding the MoS 2 surface from the analyte prevents its poisoning, potential degradation, or long-term aging induced by contact with the MB-containing solution. As the MB concentration in water increases, there is a corresponding augmentation in the overall MB optical absorption peak at around 664 nm, 24 thereby directly impacting the device's reflectivity and causing exciton dynamics. Consequently, monitoring the exciton dynamics facilitates the direct detection of various MB concentrations.…”

Section: ■ Introductionmentioning

confidence: 99%

Scalable and Contactless Optical Dye Sensors Based on Differential Reflectivity of Excitonic Peaks by MoS₂ Nanostructures

Mouloua,

Kaja,

Lejeune

et al. 2024

ACS Appl. Nano Mater.

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Due to their excellent optoelectronic properties, twodimensional nanomaterials are becoming key in developing various sensors for detecting harmful environmental pollutants. In this study, we present an approach for detecting methylene blue (MB) pollutants using a contactless optical sensor based on molybdenum disulfide (MoS 2 ) nanostructures. Our approach involves exploiting the interaction between the optical absorption of MB and the excitons of MoS 2 , considered as markers, to monitor the presence of the MB contaminant at various concentrations. For this purpose, MoS 2 nanostructures are deposited onto a quartz substrate via chemical vapor deposition, exhibiting exceptional crystalline quality and a triangular-like morphology. We demonstrate a high-sensitivity (with a limit of detection as low as 1 ng•L −1 ) dynamic response for the MoS 2 / quartz-based device in reflectivity measurements from MoS 2 nanostructure excitons as a function of the MB concentration variation. Specifically, we show that the reflectivity intensity ratio at A and B exciton positions is directly related to the change in MB concentration in the analyte. Furthermore, the proposed sensor device features highly persistent reusability, owing to its contactless configuration with the MB pollutant, which preserves the MoS 2 sensing layer from poisoning and/or alteration. Our findings provide valuable insights for potential developments aimed at achieving highly accurate and reliable next-generation optical sensors based on two-dimensional nanomaterials.

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One-step chemically vapor deposited hybrid 1T-MoS2/2H-MoS2 heterostructures towards methylene blue photodegradation

Cited by 13 publications

References 59 publications

Construction of Hierarchical Yolk–Shell Co/N-Dope C@void@C@MoS₂ Composites with Multiple Heterogeneous Interfaces toward Broadband Electromagnetic Wave Absorption

Construction of Hierarchical Yolk–Shell Co/N-Dope C@void@C@MoS₂ Composites with Multiple Heterogeneous Interfaces toward Broadband Electromagnetic Wave Absorption

Coexisting Phases in Transition Metal Dichalcogenides: Overview, Synthesis, Applications, and Prospects

Scalable and Contactless Optical Dye Sensors Based on Differential Reflectivity of Excitonic Peaks by MoS₂ Nanostructures

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One-step chemically vapor deposited hybrid 1T-MoS2/2H-MoS2 heterostructures towards methylene blue photodegradation

Cited by 13 publications

References 59 publications

Construction of Hierarchical Yolk–Shell Co/N-Dope C@void@C@MoS2 Composites with Multiple Heterogeneous Interfaces toward Broadband Electromagnetic Wave Absorption

Construction of Hierarchical Yolk–Shell Co/N-Dope C@void@C@MoS2 Composites with Multiple Heterogeneous Interfaces toward Broadband Electromagnetic Wave Absorption

Coexisting Phases in Transition Metal Dichalcogenides: Overview, Synthesis, Applications, and Prospects

Scalable and Contactless Optical Dye Sensors Based on Differential Reflectivity of Excitonic Peaks by MoS2 Nanostructures

Contact Info

Product

Resources

About

Construction of Hierarchical Yolk–Shell Co/N-Dope C@void@C@MoS₂ Composites with Multiple Heterogeneous Interfaces toward Broadband Electromagnetic Wave Absorption

Construction of Hierarchical Yolk–Shell Co/N-Dope C@void@C@MoS₂ Composites with Multiple Heterogeneous Interfaces toward Broadband Electromagnetic Wave Absorption

Scalable and Contactless Optical Dye Sensors Based on Differential Reflectivity of Excitonic Peaks by MoS₂ Nanostructures