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<p>This study develops a novel hybrid nanocomposite of polyvinyl pyrrolidone/carboxymethyl cellulose (PVP/CMC) integrated with MnMoO<sub>4</sub> nanostructures and varying MoS<sub>2</sub> nanosheet concentrations (0–0.04 wt%). Films were fabricated by solution casting. XRD confirms crystalline filler integration, increasing the crystallinity index from 0 to 14.0% at 0.04 wt% MoS<sub>2</sub>. The direct bandgap reduces from 4.96 to 4.69 eV, while nonlinear optical parameters peak at 0.04 wt% MoS<sub>2</sub> loading. Fluorescence achieves 94.5% color purity at 320 nm excitation, with tunable emission from deep blue (&gt; 100,000 K) to warm white-green (7,450–10,340 K). The main result is that the PVP/CMC/MnMoO<sub>4</sub>/0.04 wt% MoS<sub>2</sub> nanocomposite achieves superior dual radiation shielding: at 0.015 MeV, the linear attenuation coefficient increases from 1.44 to 1.86 cm⁻<sup>1</sup>, while the fast neutron removal cross-section exceeds that of water and graphite. The novelty and significance lie in the first systematic investigation of MnMoO<sub>4</sub> and MoS<sub>2</sub> as a hybrid filler system in a PVP/CMC matrix. The synergistic combination of high-Z elements (Mn, Mo) from both fillers enables unprecedented multifunctionality—tunable optics, high-purity fluorescence, and lightweight flexible radiation shielding—addressing a critical gap for applications in optoelectronics, fluorescent sensors, and nuclear safety.</p>

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PVP/CMC/MnMoO4/MoS2 hybrid nanocomposites: synergistic tuning of optical, fluorescence, and dual radiation shielding performance

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • A. M. El-naggar,
  • A. M. Kamal

摘要

This study develops a novel hybrid nanocomposite of polyvinyl pyrrolidone/carboxymethyl cellulose (PVP/CMC) integrated with MnMoO4 nanostructures and varying MoS2 nanosheet concentrations (0–0.04 wt%). Films were fabricated by solution casting. XRD confirms crystalline filler integration, increasing the crystallinity index from 0 to 14.0% at 0.04 wt% MoS2. The direct bandgap reduces from 4.96 to 4.69 eV, while nonlinear optical parameters peak at 0.04 wt% MoS2 loading. Fluorescence achieves 94.5% color purity at 320 nm excitation, with tunable emission from deep blue (> 100,000 K) to warm white-green (7,450–10,340 K). The main result is that the PVP/CMC/MnMoO4/0.04 wt% MoS2 nanocomposite achieves superior dual radiation shielding: at 0.015 MeV, the linear attenuation coefficient increases from 1.44 to 1.86 cm⁻1, while the fast neutron removal cross-section exceeds that of water and graphite. The novelty and significance lie in the first systematic investigation of MnMoO4 and MoS2 as a hybrid filler system in a PVP/CMC matrix. The synergistic combination of high-Z elements (Mn, Mo) from both fillers enables unprecedented multifunctionality—tunable optics, high-purity fluorescence, and lightweight flexible radiation shielding—addressing a critical gap for applications in optoelectronics, fluorescent sensors, and nuclear safety.