The development of a durable and efficient composite material that could perform a long-life antibacterial activity and radical scavenging ability is highly needed. In this paper, selenium nanostructures of different morphologies were synthesized by a wet chemical method under mild experimental setup. Silver nanoparticles were doped on the surface of these nanostructures and successfully characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray, and high-resolution transmission electron microscopy. The potential applications of the designed composite were investigated in multiple disciplines including antibacterial, antioxidant, and photocatalytic activities. The selenium silver (Se–Ag) nanocomposite was employed as an antibacterial agent against a Gram-positive bacterium and a Gram-negative bacterium, and our findings disclosed that the designed composite is an excellent material in inhibiting the challenged bacterial strains. The Se–Ag composite has shown excellent activity with 30-mm inhibition zone at 2 mg/ml concentration, and maintains significant antibacterial efficacy for 72 h, indicating its sustainable performance for a long-life period. Furthermore, Se–Ag nanocomposite also exhibited a significant radical scavenging property against 2,2-diphenyl-1-picrylhydrazyl free radical and an enhanced photocatalytic activity (90–95%) with complete dye decolorization in 70 min. The superior antibacterial activity (zone of inhibition 30 mm), photocatalytic (95%) and antioxidant performance (78%) of the nanocomposite are due to the combined antibacterial (17 mm), photocatalytic (~ 30%) and antioxidant potentials (15%) of the Ag and Se (16 mm, 40%, 25%), respectively.

中文翻译：

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硒银纳米结构的合成，具有增强的抗菌，光催化和抗氧化活性

迫切需要开发一种能够执行长寿命抗菌活性和自由基清除能力的耐用高效复合材料。在温和的实验条件下，采用湿化学法合成了不同形态的硒纳米结构。银纳米颗粒被掺杂在这些纳米结构的表面上，并通过X射线衍射，扫描电子显微镜，能量分散X射线和高分辨率透射电子显微镜成功表征。设计的复合材料的潜在应用已在包括抗菌，抗氧化剂和光催化活性在内的多个领域进行了研究。硒银（Se-Ag）纳米复合材料被用作针对革兰氏阳性细菌和革兰氏阴性细菌的抗菌剂，我们的研究结果表明，设计的复合材料是抑制挑战性细菌菌株的极佳材料。Se-Ag复合材料在2 mg / ml的浓度下具有30 mm的抑制区，表现出出色的活性，并在72 h内具有显着的抗菌效果，表明其可持续的使用寿命很长。此外，Se-Ag纳米复合材料还具有显着的自由基清除性能，可抵抗2,2-二苯基-1-吡啶并肼基自由基，并具有增强的光催化活性（90-95％），且在70分钟内染料完全脱色。纳米复合材料具有卓越的抗菌活性（抑制区域为30 mm），光催化（95％）和抗氧化性能（78％），是由于抗菌剂（17 mm），光催化（〜30％）和抗氧化电位（15％）共同作用的结果）的银和硒（16 mm，40％，