The extraction of bimetallic Au-Pt nanoparticles is interesting due to their multiple applications in catalytic processes, electronic devices, photothermal therapies, among others. On the other hand, the tendency of nanoparticles forming agglomerates may modify the behavior of the material, and thus their applications. This study shows a highly reproducible novel synthesis method, which only uses two organic agents (sucrose and ascorbic acid) as the reducing and stabilizing agents from nano-agglomerates of Au-Pt at room temperature. The TEM images show agglomerates with a mass fractal structure. We identified crystalline FCC, corresponding to the Au-Pt alloy. Furthermore, the coexistence of gold and platinum nanoparticles was shown through the EDS analysis. The UV-Vis spectrum showed that the resonance plasmon identified coincides with a great approximation to the results reported in the literature. Additionally, the agglomerates exhibited excellent antibacterial activity against bacteria Escherichia coli .

中文翻译：

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Au-Pt双金属纳米颗粒的团聚体：合成和抗菌活性

双金属 Au-Pt 纳米颗粒的提取很有趣，因为它们在催化过程、电子设备、光热疗法等方面有多种应用。另一方面，纳米颗粒形成团块的趋势可能会改变材料的行为，从而改变它们的应用。本研究展示了一种高度可重复的新型合成方法，该方法仅使用两种有机试剂（蔗糖和抗坏血酸）作为室温下 Au-Pt 纳米团聚体的还原剂和稳定剂。TEM 图像显示具有质量分形结构的团聚体。我们确定了结晶 FCC，对应于 Au-Pt 合金。此外，通过 EDS 分析显示了金和铂纳米粒子的共存。UV-Vis 光谱表明，所鉴定的共振等离子体与文献中报道的结果非常近似。此外，团聚体对细菌大肠杆菌表现出优异的抗菌活性。