Exploring the Structural, Optical and Surface Area Properties of Mos₂ Nanoparticles

S. Sangeethavanathi ^{1, 2*}, P. Gowthaman¹, S. Vigneswaran² and M. Sathishkumar³

¹Department of Electronics, Erode Arts and Science College, Erode, India.

²Department of Electronics, Sri Vasavi College, Erode, India.

³Department of Electronics, Nehru Arts and Science College, Coimbatore, India.

Corresponding Author E-mail: rameshvanathi@gmail.com

DOI : http://dx.doi.org/10.13005/msri/210204

ABSTRACT: This study delves into the development and characterization of MoS₂ nanoparticles, employing a hydrothermal approach. The synthesized MoS₂ nanoparticles underwent comprehensive analysis utilizing various analytical techniques such as X-ray Diffraction (XRD), Raman spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray spectroscopy (EDX), UV-Visible spectroscopy, and BET surface analysis. XRD analysis revealed the presence of a hexagonal phase structure with a crystallite size of 13 nm, indicating the nanoscale nature of the synthesized material. RAMAN spectroscopy confirmed the presence of characteristic peaks corresponding to Mo and S, validating the composition of the composites. FESEM images shows that the formation of flake like morphology and EDX affirmed the presence of Mo and S elements with the absence of other impurities, ensuring the purity of the MoS₂ nanoparticles. UV-visible spectroscopy exhibited an energy band gap of 2.37 eV, suggesting potential applications in optoelectronic devices. BET surface area analysis revealed a surface area of 80 m²/g, indicative of the high surface area of the composites, which may enhance their reactivity and performance in various applications. These findings contribute to the understanding of MoS₂ nanoparticles and their potential utilization in fields such as solar cell, catalysis, sensing, and energy storage. KEYWORDS: MoS2; Nanoparticles; Optical Properties; Structural; Solar Cell

Copy the following to cite this article: Sangeethavanathi S, Gowthaman P, Vigneswaran S, Sathishkumar M. Exploring the Structural, Optical and Surface Area Properties of Mos2 Nanoparticles. Mat. Sci. Res. India;21(2).

Copy the following to cite this URL: Sangeethavanathi S, Gowthaman P, Vigneswaran S, Sathishkumar M. Exploring the Structural, Optical and Surface Area Properties of Mos2 Nanoparticles. Mat. Sci. Res. India;21(2). Available from: https://bit.ly/3WM9Mdb

Introduction

Molybdenum disulfide (MoS₂) nanoparticles have emerged as a cornerstone in materials science, owing to their exceptional chemical and thermal properties, robustness, and versatility. As a two-dimensional material, MoS₂ has captivated researchers worldwide for its intriguing electronic and optical characteristics, which hold immense promise for a myriad of applications ^1-2. One particularly enticing avenue lies in integrating MoS₂ into composite materials, with the aim of augmenting light absorption, capitalizing on its inherent capability to capture photons across the visible spectrum ³. The extensive utilization of MoS₂ chalcogenides underscores their significance across diverse fields. With a small band gap, expansive surface area, high electrical conductivity, minimal charge transfer resistance, substantial specific capacitance, remarkable electrocatalytic activity, and exceptional chemical resilience, MoS₂ chalcogenides have found utility in a wide array of applications ⁴. From energy storage to catalysis, their multifaceted properties have propelled them to the forefront of materials research, offering solutions to pressing challenges in various technological domains ⁵.

As the global demand for renewable energy sources continues to rise, the quest for efficient and cost-effective solar cell technologies has become increasingly paramount. Among the materials investigated for their potential in photovoltaic applications, molybdenum disulfide (MoS₂) has emerged as a promising candidate, thanks to its unique electronic, optical, and structural properties ⁶. MoS₂ layered structure, coupled with its excellent electrical conductivity and high carrier mobility, presents exciting opportunities for enhancing the performance of solar cells. Synthesis plays a pivotal role in tailoring the properties of MoS₂ for solar cell applications ⁷. Various synthesis techniques have been explored to produce MoS₂ nanostructures with controlled morphology, size, and crystallinity. Among these methods, chemical vapor deposition (CVD), hydrothermal synthesis, and solvothermal synthesis have emerged as prominent routes for fabricating MoS₂ and nanostructures with precise control over their properties ⁸.

Hydrothermal synthesis has emerged as a versatile and efficient method for the fabrication of various nanomaterials with tailored properties for diverse applications. Among these materials, molybdenum disulfide (MoS₂) stands out as a promising candidate due to its unique structural and electronic properties, rendering it suitable for applications ranging from catalysis and energy storage to optoelectronics and sensing ⁹. In recent years, hydrothermal synthesis has gained traction as a preferred route for the preparation of MoS₂ nanostructures with controlled morphology, size, and crystallinity. This method offers distinct advantages, including mild reaction conditions, scalability, and the ability to tune the properties of the resulting MoS₂ materials through parameter optimization ¹⁰. In recent years, significant progress has been made in understanding the synthesis–structure–property relationships of MoS₂ for solar cell applications. Researchers have focused on optimizing synthesis parameters, such as temperature, precursor concentration, and reaction time, to tailor the optoelectronic properties of MoS₂ and enhance their compatibility with solar cell architectures ¹¹.

Molybdenum disulfide (MoS₂) exhibits several important optical properties such as Bandgap, Absorption Spectrum, Photoluminescence, Exciting Binding Energy, Optical Transparency, and Nonlinear Optical Properties ¹². MoS₂ is a semiconductor with a direct bandgap in the range of 1.1 to 1.9 electron volts (eV), depending on its thickness and structure. This bandgap makes it suitable for optoelectronic applications, including solar cells ¹³. MoS₂ absorbs light predominantly in the visible range of the electromagnetic spectrum, with absorption increasing towards shorter wavelengths. This property allows MoS₂ to efficiently capture sunlight, making it advantageous for photovoltaic applications. When excited by photons, MoS₂ emits light through a process known as photoluminescence ¹⁴.

The emitted light typically falls within the visible to near-infrared range, and the intensity and peak wavelength can be influenced by factors such as layer thickness and defect density ¹⁵. MoS₂ exhibits strong excitonic effects due to its two-dimensional nature and quantum confinement effects. Excitons, which are bound electron-hole pairs, play a crucial role in the material’s optical properties, including absorption and emission spectra ¹⁶. MoS₂ is transparent to a wide range of wavelengths beyond its bandgap, particularly in the near-infrared region. This transparency can be advantageous for certain optoelectronic applications, such as photodetectors and light-emitting diodes (LEDs) ¹⁷. MoS₂ displays nonlinear optical behavior, meaning its optical properties change non-proportionally with the intensity of incident light. This property can be harnessed for applications such as nonlinear optics and optical switching ¹⁸. Overall, the optical properties of MoS₂ make it a versatile material for various optoelectronic devices, including solar cells, photodetectors, LEDs, and optical modulators. Researchers continue to explore and exploit these properties to develop innovative technologies with improved performance and efficiency.

This article examines the structural, optical, and surface area features of MoS₂ nanoparticles, focusing on their essential traits that make them widely useful. By conducting a thorough research using modern characterization techniques, our goal is to uncover the inherent properties of MoS₂ nanoparticles, shedding light on potential uses in state-of-the-art applications. Through the detailed examination of the complex relationship between the arrangement of atoms, the way light interacts with the material, and the characteristics of its surface, our goal is to enhance the overall knowledge of materials made from MoS₂. This will promote the development of new ideas and progress in the fields of materials science and engineering.

Materials and Methods

The sodium molybdate dihydrate (Na₂MoO₄ 2H₂O), thiourea (CH₄N₂S),  and hydrazine hydrate solution (N₂H₄.xH₂O) and sulfuric acid  (H₂SO₄) were all purchased from merk india with analytical quality and required no further purification.

The conventional method for synthesizing MoS₂ involves the vigorous mixing of a 1:1 M solution of Na₂MoO₄.2H₂O and CH₄N₂S in 100 mL of deionized water for duration of 60 minutes. then, a volume of 10 mL of N₂H₄.xH₂O was incrementally introduced into the aforementioned solution, leading to the development of a precipitate with a black hue. The pH of the solution was then modified to 7 with the addition of H₂SO₄. Subsequently, the black precipitate was transferred to an autoclave and incubated for duration of 12 hours at a temperature of 180°C. The residue was collected, rinsed with deionized water, and subjected to overnight drying at a temperature of 45°C. Furthermore, Figure 1 depicted a schematic illustration of the experimental preparation.

Figure 1: Schematic representation for synthesis of MoS2 nanoparticles Click here to View Figure

Characterization Details

Structural analysis was performed using a high-resolution X-ray diffractometer (XRD) (XPERT-PRO) to determine the crystalline structure, while Raman spectroscopy (WITech CRM200) provided insights into the molecular vibrational modes. Morphological and elemental composition analysis was carried out using a Field Emission Scanning Electron Microscope (FESEM) (Sigma HV – Carl ZEISS) equipped with Bruker Quantax 200-Z10 Energy-Dispersive X-ray Spectroscopy (EDS) detector. The surface area of the nanoparticles was determined using a Nova 2200e Analyzer through N₂ adsorption and desorption processes. Optical properties were investigated using UV-Vis spectrometer (Hitachi-UH5300, λ = 200–900 nm) to assess their absorbance characteristics in the ultraviolet-visible range. These characterization techniques collectively provided a comprehensive understanding of the synthesized MoS₂ nanoparticles, paving the way for their potential applications in various technological fields.

Results and Discussion

X-ray diffraction (XRD) analysis was conducted to investigate the crystalline quality and phase purity of MoS₂ synthesized via the hydrothermal method and shown in Figure 2 (A). The XRD pattern exhibited distinct peaks at 2θ angles of 14.36º, 32.59º, 39.45º, 49.71º, 58.29º, and 66.51º, corresponding to the (002), (100), (103), (105), (110), and (114) diffraction planes of hexagonal MoS₂, respectively. These peaks were in excellent agreement with the standard hexagonal structure of MoS₂ (JCPDS no. 37-1492), confirming the successful synthesis of MoS₂ via the hydrothermal method. The intensity of the XRD peaks showed that the synthesized MoS2 was crystalline. Sharp and well-defined peaks indicated high crystallinity and phase purity in the synthesized material. This is indicative of the formation of highly crystalline MoS2 nanostructures with well-defined atomic arrangements. Additionally, the XRD analysis provided insights into the size of the crystallites in the synthesized MoS₂. The broadening of the XRD peaks observed in the pattern indicated a finite size effect, characteristic of nanomaterials. Using the Scherrer equation ¹⁹, the crystallite size of the MoS₂ was estimated to be approximately 13 nm. This nanoscale size is consistent with the dimensions expected for materials synthesized via the hydrothermal method and further confirms the formation of MoS₂ nanostructures. Overall, the XRD results demonstrate that the hydrothermal method was successful in producing high-quality MoS₂ with a well-defined hexagonal structure and nanoscale crystallite size. These findings highlight the potential of hydrothermal synthesis for controlling the crystalline quality and size of MoS₂ nanostructures ^20.

The Raman spectra revealed (Figure 2B) distinctive peaks corresponding to specific vibrational modes of the MoS₂ crystal lattice. The major Raman peaks observed were the E¹_2g and A_1g modes, which appeared prominently at 378 cm^-1 and 413 cm^-1, respectively. These peaks are indicative of the characteristic vibrational modes associated with the hexagonal lattice structure of MoS₂ ²¹. The presence of these peaks confirms the successful synthesis of MoS₂ with the desired crystalline structure via the hydrothermal method. Additionally, the Raman spectra exhibited the presence of the 2LA (M) peak at 228 cm^-1 and 280 cm^-1, representing the second-order longitudinal acoustic (2LA) phonon mode. The appearance of this peak further confirms the crystallinity of the synthesized MoS₂, as the 2LA (M) mode is a characteristic feature of well-ordered layered structures ¹⁵. Furthermore, the Raman spectra revealed the presence of peaks corresponding to the combination of the 2LA (M) and 2TA (M) phonon modes at 456 cm^-1. These peaks provide additional evidence of the crystalline quality of the synthesized MoS₂, as they arise from the interaction between acoustic and optical phonon modes in the MoS₂ crystal lattice.

The FESEM images depicted in Figure 2C clearly showcase the morphology of the MoS₂ composites, with individual nanoparticles exhibiting distinct shapes and sizes. The presence of nanoparticles indicates the formation of layered structures characteristic of MoS₂, further confirming the successful synthesis of MoS₂ via the hydrothermal method. The FESEM images showed flakes-like morphology with varied micrometers, which matched the predicted morphology of MoS2 produced using this technique, demonstrating the hydrothermal method’s ability to regulate material morphology. Additionally, energy-dispersive X-ray spectroscopy (EDX) analysis was performed to confirm the elemental composition of the synthesized MoS₂ (Figure 2D). The EDX analysis affirmed the presence of molybdenum (Mo) and sulfur (S) elements, with no detectable impurities observed. This confirms the high purity of the synthesized MoS₂ composites and further corroborates the successful synthesis of MoS₂ via the hydrothermal method. Overall, the FESEM results demonstrate that the hydrothermal method was effective in producing MoS₂ with well-defined flake like morphology, indicative of its microstructured form. The absence of impurities confirmed by EDX analysis further underscores the purity of the synthesized MoS₂ composites. These findings highlight the influence of the hydrothermal method on controlling the crystalline morphology and purity of MoS₂, making it a promising approach for the synthesis of MoS₂ nanostructures for various applications.

Figure 2: Synthesized MoS2 nanoparticles (A) XRD Analysis (B) Raman spectrum (C) FESEM images (D) EDX spectrum Click here to View Figure

The UV-Visible absorption spectra of synthesized MoS₂ were analyzed to elucidate their optical properties, shedding light on their potential applications in solar cell technology. Figure 3A illustrates the absorption spectra of MoS₂ across the visible spectrum, revealing significant absorption between 400 and 700 nm. The observed absorption peaks in the UV-Visible spectrum indicate the ability of MoS₂ to efficiently capture photons within the visible range, a critical requirement for solar cell applications. The absorption of light in this spectral range suggests that MoS₂ possess favorable optical properties for harnessing solar energy. To further characterize the optical properties of MoS₂, the Tauc equation ²² (Figure 3B) was employed to determine the band gap energies associated with the material. The calculated band gap energy was found to be 2.37 eV, indicating a relatively low band gap for MoS₂ synthesized via the hydrothermal method. This low band gap is attributed to the enhanced crystalline structure of the synthesized MoS₂, which facilitates efficient light absorption across a broader range of wavelengths. The low band gap energy of MoS₂ suggests their potential for effectively collecting larger amounts of light for solar cell applications. By efficiently absorbing photons across the visible spectrum, MoS₂ synthesized via the hydrothermal method offer promising opportunities for enhancing the efficiency ²³. Overall, the UV-Visible absorption results underscore the favorable optical properties of MoS₂ synthesized via the hydrothermal method, positioning them as promising materials for solar cell applications. The low band gap energy, coupled with the significant absorption of light in the visible range, highlights the potential of MoS₂ for advancing solar energy conversion technologies ²⁴.

The Berrett-Joyner-Halenda (BJH) adsorption approach was employed to assess the specific surface area, pore volume, and pore size distribution of the synthesized MoS₂, providing insights into their surface area properties. Figure 3C illustrates the adsorption-desorption isotherms of nitrogen molecules, which were used to determine the surface area and pore characteristics of the MoS₂ nanoparticles. The specific surface area of the MoS₂ material was determined to be 80 m²/g, indicating a relatively high surface area conducive to various catalytic applications. The calculated pore size of MoS₂ was approximately 18 nm (Figure 3D), suggesting the presence of mesopores within the material. The nitrogen adsorption-desorption isotherm exhibited type IV behavior with hysteresis loops, indicative of mesoporous characteristics in the MoS₂ material ²⁵. This type of isotherm suggests the presence of well-defined mesopores, which are desirable for facilitating mass transport and providing active sites for catalytic reactions. Overall, the BET surface analysis results demonstrate that the hydrothermal synthesis method effectively produced MoS₂ with a distinct surface area and mesoporous structure ²⁶. The high specific surface area and mesoporous nature of the synthesized MoS₂ materials make them promising candidates for various catalytic applications, including energy conversion, environmental remediation, and chemical synthesis. These findings underscore the influence of the hydrothermal method on controlling the surface area properties of MoS₂, offering insights into their potential for enhancing catalytic performance in diverse applications. The produced MoS₂ nanoparticles exhibit significant light absorption across the visible spectrum, a feature further emphasized by the low band gap energy determined through UV-Visible absorption spectroscopy, highlighting their potential suitability for solar cell applications.

Figure 3: Synthesized MoS2 nanoparticles (A) UV-Visible absorbance spectrum (B) Tauc Plot of MoS2 nanoparticles (C) N2 adsorption / desorption analysis MoS2 nanoparticles (D) Pore size distribution of MoS2 nanoparticles Click here to View Figure

The efficacy of the hydrothermal approach in producing MoS₂ nanoparticles with favorable structural, optical, and surface area characteristics has been demonstrated. XRD examination confirms the successful creation of MoS₂ nanoparticles with the required crystalline structure, as evidenced by the hexagonal phase structure observed. The homogeneity and small size distribution of the produced MoS₂ material are indicated by the nanoscale crystallite size, offering advantages in terms of enhancing its optical and catalytic properties. The MoS₂ nanoparticles synthesized via the hydrothermal technique demonstrate enhanced light absorption characteristics attributed to their well-defined crystalline structure and nanoscale morphology. Additionally, these MoS₂ nanoparticles possess notable specific surface area and mesoporous properties, opening up a wide range of potential applications ²⁷.

Table 1: EDX elements ratio analysis of the prepared MoS₂

Samples	Mo Content %	S Content %	Total %
MoS2	59.85	40.15	100

MoS₂ has numerous optical characteristics that render it very suitable for utilization in solar cell applications. MoS₂ possesses a direct bandgap that can be adjusted by manipulating the layer count of the material. By manipulating the crystallite size and morphology of MoS₂ layers, it is possible to fine-tune its absorption spectrum to align with the solar spectrum. This, in turn, enhances its efficiency in converting sunlight into electricity ²⁸. MoS₂ demonstrates high light absorption in the visible region of the electromagnetic spectrum. This is essential for solar cells, as it allows them to capture a substantial amount of sunlight, resulting in increased efficiency. MoS₂ exhibits a high degree of electron mobility, indicating that electrons can readily traverse the material when stimulated by photons ²⁹. This promotes effective charge transfer within the solar cell, minimizing recombination losses and improving the overall performance of the device. MoS₂ exhibits high chemical stability under normal environmental circumstances, ensuring the long-term dependability of solar cells that utilize this material. MoS₂ possesses a distinctive blend of optical properties, which renders it a highly attractive contender for improving the effectiveness and efficiency of solar cells. This, in turn, has the potential to result in more economically viable and environmentally friendly solar energy harvesting systems ³⁰.

Conclusion

In conclusion, the hydrothermal synthesis method has proven to be highly effective in producing MoS₂ nanostructures with desirable characteristics for various applications. Through comprehensive analysis and discussion of results, it is evident that the synthesized MoS₂ exhibits exceptional crystalline quality, structural integrity, and optical properties. X-ray diffraction (XRD) analysis confirmed the successful synthesis of MoS₂ with a well-defined hexagonal structure and nanoscale crystallite size, indicative of high-quality material. The presence of distinctive peaks corresponding to specific vibrational modes in the Raman spectra further affirmed the crystalline nature of the synthesized MoS₂, along with the characteristic flake like morphology observed in FESEM images. Moreover, UV-Visible absorption spectroscopy revealed significant light absorption within the visible spectrum, emphasizing the material’s potential for solar energy applications. The low band gap energy of 2.37 eV suggests efficient photon absorption, further supported by the mesoporous structure observed through BET surface analysis, which enhances catalytic performance. Overall, the findings highlight the versatility and promise of MoS₂ synthesized via the hydrothermal method. The material’s combination of superior crystalline quality, optical properties, and surface area characteristics positions it as a viable candidate for a wide range of applications, including solar cells, catalysis, and environmental remediation. The success of this synthesis approach underscores its potential for advancing materials science and contributing to the development of innovative technologies for sustainable energy and environmental solutions.

Acknowledgments

The authors would like to express their sincere gratitude to the Thin Film Research Center, Department of Electronics, Erode Arts and Science College, Erode, for generously providing the necessary research facilities for this study.

Conflict of Interest

The authors declare that there are no conflicts of interest regarding the publication of this manuscript.

Funding Source

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

References

1. Meng Z, Fan J, Chen A, Xie X. Functionalized MoS₂ catalysts for CO₂ capture and conversion: a review. Mater Today Chem. 2023;29:101449.
   CrossRef
2. Diao X, Ji N. Rational design of MoS2-based catalysts toward lignin hydrodeoxygenation: Interplay of structure, catalysis, and stability. J Energy Chem. 2023;77:601-631.
   CrossRef
3. Su HY, Liao W, Sun K. First-principles and microkinetic simulation studies of CO₂ hydrogenation mechanism and active site on MoS₂ catalyst. Appl Surf Sci. 2023;635:157721.
   CrossRef
4. Fu W, Ji G, Chen H, Yang S, BaoGuo, Yang H, Huang Z. Molybdenum sulphide modified chelating resin for toxic metal adsorption from acid mine wastewater. Sep Purif Technol. 2020;251:117407.
   CrossRef
5. Sathishkumar M, Geethalakshmi S. Enhanced photocatalytic and antibacterial activity of Cu:SnO₂ nanoparticles synthesized by microwave assisted method. Mater Today Proc. 2020;20(1):54-63.
   CrossRef
6. Kannan S, Subiramaniyam NP, Sathishkumar M. Investigation on the structural, optical and photocatalytic degradation properties of Zns/Mn:Zns thin films under visible light irradiation. Mater Today Proc. 2021;38(2):907-912.
   CrossRef
7. Kannan S, Subiramaniyam NP, Sathishkumar M. Effect of annealing temperature and Mn doping on the structural and optical properties of ZnS thin films for enhanced photocatalytic degradation under visible light irradiation. Inorg Chem Commun. 2020;119:108068.
   CrossRef
8. Sathishkumar M, Saroja M, Venkatachalam M, Gowthaman P, Kannan S, Balamurugan A. rGO encapsulated ZnS photocatalysts for enhanced hydrogen evolution. Mater Lett. 2022;323:132534.
   CrossRef
9. Mani SK, Saroja M, Venkatachalam M, Rajamanickam T. Antimicrobial activity and photocatalytic degradation properties of zinc sulfide nanoparticles synthesized by using plant extracts. J Nanostruct. 2018;8(2):107-118.
10. Kannan S, Subiramaniyam NP, Sathishkumar M. A novel green synthesis approach for improved photocatalytic activity and antibacterial properties of zinc sulfide nanoparticles using plant extract of Acalyphaindica and Tridaxprocumbens. J Mater Sci Mater Electron. 2020;31(12):9846-9859.
    CrossRef
11. Sathishkumar M, Rajamanickam AT, Saroja M. Characterization, antimicrobial activity and photocatalytic degradation properties of pure and biosynthesized zinc sulfide nanoparticles using plant extracts. J Mater Sci Mater Electron. 2018;29(16):14200-14209.
    CrossRef
12. Wang, T., Xue, S.-M., Song, T., Ma, L., Liu, Z.-J., & Sun, X.-W. First-principles study of the structural phase transition and optical properties for MoS₂ at high pressure. Chemical Physics Letters. 2023; 825:140579.
    CrossRef
13. Sharma, C., Srivastava, A. K., & Gupta, M. K. Structural, optical and temperature dependent electric modulus property of few-layer MoS₂ nanosheets. Physica B: Condensed Matter. 2023; 669: 415290.
    CrossRef
14. Khan, M. I., Ali, S., Alwadai, N., Haq, I.-u., Irfan, M., Albalawi, H., Almuqrin, A. H., Almoneef, M. M., & Iqbal, M. Structural, electrical and optical properties of heterostructured MoS₂/ZnO thin films for potential perovskite solar cells application. Journal of Materials Research and Technology. 2022; 20: 1616-1623.
    CrossRef
15. Feng, L.-P., Su, J., & Liu, Z.-t. Effect of vacancies on structural, electronic and optical properties of monolayer MoS₂: A first-principles study. Journal of Alloys and Compounds. 2014; 613: 122-127.
    CrossRef
16. Qiu, D., Lee, D. U., Pak, S. W., & Kim, E. K. Structural and optical properties of MoS₂ layers grown by successive two-step chemical vapor deposition method. Thin Solid Films. 2015; 587: 47-51.
    CrossRef
17. Ogata, S., & Imura, K. Optical properties of multilayer MoS₂ modified with thermal and shape transformation by laser irradiation. Chemical Physics Letters. 2023; 831: 140859.
    CrossRef
18. Khan, M., Kumar, S., Mishra, A., Sulania, I., Tripathi, M. N., & Tripathi, A. Study of structural and electronic properties of few-layer MoS₂ film. Materials Today: Proceedings. 2022; 57 (Part 1): 100-105.
    CrossRef
19. Wang L, Zheng X, Yan L, et al. Multiphasic MoS₂ activates peroxymonosulfate for efficient removal of oxytetracycline: The dominant role of surface reactive species. Sep Purif Technol. 2023;317:123907.
    CrossRef
20. Yuan Y, Guo RT, Hong LF, Ji XY, Li ZS, Lin ZD, Pan WG. Recent advances and perspectives of MoS₂-based materials for photocatalytic dyes degradation: A review. Colloids Surf A Physicochem Eng Asp. 2021;611:125836.
    CrossRef
21. Wu MH, Li L, Liu N, et al. Molybdenum disulfide (MoS₂) as a co-catalyst for photocatalytic degradation of organic contaminants: A review. Process Saf Environ Prot. 2018;118:40-58.
    CrossRef
22. Oad N, Chandra P, Mohammad A, Tripathi B, Yoon T. MoS2-based hetero-nanostructures for photocatalytic, photoelectrocatalytic and piezocatalytic remediation of hazardous pharmaceuticals. J Environ Chem Eng. 2023;11(3):109604.
    CrossRef
23. Chandra P, Mohammad A, Tripathi B, Yoon T. Recent advancements in molybdenum disulfide (MoS₂) and its functional nanostructures for photocatalytic and non-photocatalytic organic transformations. Flat Chem. 2022;34:100395.
    CrossRef
24. Panchal D, Sharma A, Pal S. Engineered MoS₂ nanostructures for improved photocatalytic applications in water treatment. Mater Today Sustainability. 2023;21:100264.
    CrossRef
25. Sethulekshmi AS, Saritha A, Joseph K, Aprem AS, Sisupal SB. MoS2 based nanomaterials: Advanced antibacterial agents for future. J Control Release. 2022;348:158-185.
    CrossRef
26. Zhang M, Wang K, Zeng S, et al. Visible light-induced antibacterial effect of MoS₂: Effect of the synthesis methods. Chem Eng J. 2021;411:128517.
    CrossRef
27. Xu Q, Zhu P, Zhang J, Liu Y, Cai L, Jiang H, Ji M, Chen J. Electrochemical formation of distinct nanostructured MoS₂ with altered antibacterial activity. Mater Lett. 2020;271:127809.
    CrossRef
28. Patel, A. K., Mishra, R., & Soni, S. K. Performance enhancement of CIGS solar cell with two-dimensional MoS₂ hole transport layer. Micro and Nanostructures. 2022; 165: 207195.
    CrossRef
29. Huang, Y., Shi, X., Liu, X., Cong, R., Sun, Y., Lu, W., & Yu, W. Boosting the photovoltaic performance of MoS₂/Si heterojunction solar cells with thiourea-doped MoS2 films. Micro and Nanostructures. 2022; 167: 207241.
    CrossRef
30. Lu, S., Chen, M., Wang, Y., Li, R., Lin, J., & Zhang, X. Highly efficient MoS₂/rGO electrocatalysts for triiodide reduction as Pt-free counter electrode for dye-sensitized solar cells. Solar Energy. 2021; 220:788-795.
    CrossRef

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