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<p>Given the limitations of traditional antimicrobial strategies and the pressing demand for efficient, biocompatible sterilization, photochemistry-mediated approaches have emerged as promising solutions, leveraging light-matter interactions for targeted pathogen elimination. In this study, A nanocomposite was engineered through the integration of the excellent near-infrared (NIR) photothermal properties of MXene (V₂CT<sub><i>x</i></sub>) with biocompatible Ag<sub>2</sub>S nanoparticles. Subsequent to this, surface modification with polydopamine (PDA) was carried out via self-polymerization. The abundant functional groups of PDA not only enhanced biocompatibility but also amplified NIR photothermal conversion, synergizing with the intrinsic photothermal activity of V₂CT<sub><i>x</i></sub>. The Ag<sub>2</sub>S/V<sub>2</sub>CT<sub><i>x</i></sub>@PDA nanocomposite demonstrated dual functionality under 808&#xa0;nm NIR light, efficiently converting photon energy into heat (reaching a temperature of 50.2&#xa0;°C) and generating photocatalytic reactive oxygen species (ROS). Experimental results revealed an exceptional sterilization efficiency of 99.99% against Staphylococcus aureus (<i>S. aureus</i>) within 25&#xa0;min of irradiation at a power density of 0.74&#xa0;W/cm<sup>2</sup> using the optimal Ag<sub>2</sub>S-30%/V<sub>2</sub>CT<sub><i>x</i></sub>@PDA composite. This high-performance antibacterial effect is attributed to the synergistic combination of photothermal conversion and photocatalytic ROS generation, providing a rapid antibacterial strategy.</p>

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Photothermal-photocatalytic synergistic sterilization by Ag2S/V2CTx@PDA nanocomposites under 808 nm near-infrared irradiation

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Ruirui Sima,
  • Jiaqi Zhong,
  • Feiyan Xiao,
  • Hongshun S. Hao,
  • Gongliang Zhang,
  • Hongman Hou,
  • Jingran Bi,
  • Shuang Yan

摘要

Given the limitations of traditional antimicrobial strategies and the pressing demand for efficient, biocompatible sterilization, photochemistry-mediated approaches have emerged as promising solutions, leveraging light-matter interactions for targeted pathogen elimination. In this study, A nanocomposite was engineered through the integration of the excellent near-infrared (NIR) photothermal properties of MXene (V₂CTx) with biocompatible Ag2S nanoparticles. Subsequent to this, surface modification with polydopamine (PDA) was carried out via self-polymerization. The abundant functional groups of PDA not only enhanced biocompatibility but also amplified NIR photothermal conversion, synergizing with the intrinsic photothermal activity of V₂CTx. The Ag2S/V2CTx@PDA nanocomposite demonstrated dual functionality under 808 nm NIR light, efficiently converting photon energy into heat (reaching a temperature of 50.2 °C) and generating photocatalytic reactive oxygen species (ROS). Experimental results revealed an exceptional sterilization efficiency of 99.99% against Staphylococcus aureus (S. aureus) within 25 min of irradiation at a power density of 0.74 W/cm2 using the optimal Ag2S-30%/V2CTx@PDA composite. This high-performance antibacterial effect is attributed to the synergistic combination of photothermal conversion and photocatalytic ROS generation, providing a rapid antibacterial strategy.