Design and synthesis of Rh nanoparticle-decorated Ag2S nanostructures for enhanced near-infrared photothermal and photocatalytic antibacterial applications

IF 2.5 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

New Journal of Chemistry Pub Date : 2025-08-28 DOI:10.1039/D5NJ02643A

Peiyi Bai, Peng Duan, Yanbin Meng, Wanli Guo and Kuankuan Xu

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Abstract

This study reports the synthesis of Ag₂S/Rh nanostructures for enhanced antibacterial activity through combined photothermal and photocatalytic mechanisms under near-infrared (NIR) irradiation. The nanoparticles were prepared using a facile deposition method and characterized by XRD, TEM, and XPS. Photothermal experiments demonstrated rapid and efficient temperature elevation under NIR light, with Rh decoration significantly enhancing photothermal conversion. Antibacterial activity against S. pyogenes and P. aeruginosa was evaluated, showing near-complete bacterial inactivation under optimized conditions. Mechanistic investigations confirmed that hydroxyl (˙OH) and superoxide (O₂˙⁻) radicals, generated via photocatalysis, synergistically enhance bacterial inhibition. ESR spectra provided direct evidence of ROS production, correlating with reduced bacterial viability. These findings highlighted the potential of Ag₂S/Rh composites as advanced materials for combating drug-resistant pathogens via NIR-driven photothermal and photocatalytic mechanisms.

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Rh纳米粒子修饰Ag2S纳米结构的设计与合成及其在近红外光热和光催化抗菌中的应用

本研究报道了在近红外（NIR）照射下，通过光热和光催化联合机制合成具有增强抗菌活性的Ag2S/Rh纳米结构。采用快速沉积法制备了纳米颗粒，并用XRD、TEM和XPS对其进行了表征。光热实验表明，近红外光下快速有效的温度升高，Rh装饰显著提高了光热转换。对化脓性葡萄球菌和铜绿假单胞菌的抑菌活性进行了评估，在优化的条件下，细菌几乎完全失活。机理研究证实，通过光催化产生的羟基（OH）和超氧化物（O2）自由基协同增强细菌抑制作用。ESR光谱提供了ROS产生的直接证据，与细菌活力降低相关。这些发现突出了Ag2S/Rh复合材料作为通过nir驱动的光热和光催化机制对抗耐药病原体的先进材料的潜力。

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