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Controllable synthesis by hydrothermal method and optical properties of 2D MoS2/rGO nanocomposites

  • Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)
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Abstract

In this research, 2D-MoS2/rGO nanocomposites were successfully synthesized by a facile hydrothermal method using graphene oxide (GO), sodium molybdate (Na2MoO4) and thiourea (CH4N2S) as the reactants. The effect of hydrothermal temperature (180–240 °C) on structure and optical properties of the MoS2/rGO have been systematically investigated. The study of chemical composition, structural and morphological properties was performed by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS) and Raman spectroscopy, while the optical properties were measured using photoluminescence spectroscopy. The FESEM and HRTEM results revealed that the ultrathin MoS2 nanosheets with thickness in the range of ~6–13 nm (~6–8 layers) and average lateral size of ~130–330 nm were uniformly dispersed on the GO surface. Both the XRD and Raman analyses confirm that the MoS2 sheets in all prepared samples have a hexagonal phase structure (2H-MoS2). By increasing hydrothermal temperature, the characteristic diffraction peak (002) of 2H-MoS2 phase (at 2θ ≈ 14.2–14.5o) becomes sharper and its intensity gradually increases, thereby showing a very strong preferential orientation and better crystal quality. The estimated optical band gap for MoS2/rGO is achieved in the range of ~1.56–2.38 eV and it seems to be controlled by adjusting the synthesis temperature. Our work underscores the principle that controlling hydrothermal reaction temperature may constitute a generic strategy for modifying microstructure and engineering the optical bandgap of these semiconductor 2D nanocrystals, which opens the possibility of its use in electronic applications.

Graphical Abstract

Highlights

  • The 2D-MoS2/rGO nanocomposite was synthesized hydrothermally using graphene oxide, sodium molybdate and thiourea as the reactants.

  • The effect of hydrothermal temperature on structure and optical property of the MoS2/GO have been systematically investigated by FESEM, HRTEM, XRD, Raman, EDS, XPS and PL spectroscopy.

  • The results indicated that the ultrathin MoS2 nanosheets with thickness in the range of ~6–13 nm (~6–8 layers) and average lateral size of ~130–330 nm were uniformly dispersed on the rGO surface.

  • The estimated optical band gap for 2D-MoS2/rGO is achieved in the range of ~1.56–2.38 eV and it is found to be controlled by adjusting the synthesis temperature.

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Acknowledgements

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant No. 104.03-2019.42. We acknowledge the support of time and facilities from Ho Chi Minh City University of Technology (HCMUT), VNU-HCM for supporting this study.

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  1. Faculty of Materials Technology, Ho Chi Minh city University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Vietnam

    Le Ngoc Long, Nguyen Thanh Quang, Truong Tung Khuong, Pham Trung Kien & Tran Van Khai

  2. Vietnam National University - Ho Chi Minh City (VNU-HCM), Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam

    Le Ngoc Long, Nguyen Thanh Quang, Truong Tung Khuong, Pham Trung Kien & Tran Van Khai

  3. Department of Materials Technology, Faculty of Chemical Technology, Ho Chi Minh City University of Food Industry, 140 Le Trong Tan Street, Tan Phu District, Ho Chi Minh City, Vietnam

    Nguyen Hoc Thang

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Long, L.N., Quang, N.T., Khuong, T.T. et al. Controllable synthesis by hydrothermal method and optical properties of 2D MoS2/rGO nanocomposites. J Sol-Gel Sci Technol 106, 699–714 (2023). https://doi.org/10.1007/s10971-023-06072-3

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