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<p>In this study, MoS₂/reduced graphene oxide (rGO) nanocomposites were synthesized via a one-step hydrothermal process, where the Mo: C precursor ratio was systematically tuned to modulate phase composition, nanosheet morphology, and photoluminescence (PL) response. This work demonstrates quantitative stoichiometric control as a direct means to stabilize the metallic 1T phase without external dopants and to achieve simultaneous PL enhancement. X-ray diffraction and Raman spectroscopy confirmed the coexistence of metallic 1T and semiconducting 2H MoS₂ phases, with rGO facilitating vertical nanosheet growth and 1T phase stabilization. As the Mo: C ratio increased beyond 10:1, a structural transition from dispersed nanosheets to aggregated flower-like architectures was observed. Ultraviolet-visible spectra revealed strong broadband absorption, while PL emission exhibited a pronounced blue shift (≈ 35–50&#xa0;nm) and a 2.4-fold intensity increase, attributed to quantum confinement and interfacial charge transfer between MoS₂ and rGO. This study establishes a clear correlation between precursor stoichiometry and optoelectronic behavior, offering a scalable route for designing 2D heterostructures with tailored properties for potential applications.</p>

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Stoichiometric Engineering of MoS₂/rGO Nanocomposites for Intrinsic 1T–2H Phase Control and Enhanced Photoluminescence

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Thi Sinh Vo,
  • Van Phuc Thien Nguyen,
  • Van Hoan Hoang,
  • Sangyul Baik,
  • Kyunghoon Kim

摘要

In this study, MoS₂/reduced graphene oxide (rGO) nanocomposites were synthesized via a one-step hydrothermal process, where the Mo: C precursor ratio was systematically tuned to modulate phase composition, nanosheet morphology, and photoluminescence (PL) response. This work demonstrates quantitative stoichiometric control as a direct means to stabilize the metallic 1T phase without external dopants and to achieve simultaneous PL enhancement. X-ray diffraction and Raman spectroscopy confirmed the coexistence of metallic 1T and semiconducting 2H MoS₂ phases, with rGO facilitating vertical nanosheet growth and 1T phase stabilization. As the Mo: C ratio increased beyond 10:1, a structural transition from dispersed nanosheets to aggregated flower-like architectures was observed. Ultraviolet-visible spectra revealed strong broadband absorption, while PL emission exhibited a pronounced blue shift (≈ 35–50 nm) and a 2.4-fold intensity increase, attributed to quantum confinement and interfacial charge transfer between MoS₂ and rGO. This study establishes a clear correlation between precursor stoichiometry and optoelectronic behavior, offering a scalable route for designing 2D heterostructures with tailored properties for potential applications.