In this study, a simple, green, and low-cost room temperature synthesis of broccoli-like silver nanoflowers (AgNF) with a particle size of about 300–500 nm was developed using plant-derived caffeic acid as a reducing agent and polyvinylpyrrolidone as a dispersant under ultrasound assistance. The flower clusters covered by small nanocrystals of 20–50 nm significantly enhance the electromagnetic field signals. AgNF was deposited on the surface of silicon wafers as a surface-enhanced Raman spectroscopy sensor for the detection of probe molecules such as rhodamine 6G (R6G) and malachite green with high sensitivity, homogeneity, and reproducibility. AgNF was deposited on cotton fabrics in the form of composites to catalyze the degradation of dye pollutants such as R6G, MG, and methyl orange in the presence of sodium borohydride. 0.1 g of AgNF/cotton fabric could assist 15 mmol/L NaBH₄ to achieve over 90% degradation of various dyes as well as a high concentration of dyes in 12 min with good reusability and recyclability. The AgNF synthesized in this work can not only monitor the type and amounts of pollutants (dyes) in wastewater but also catalyze the rapid degradation of dyes, which is expected to be valuable for industrial applications.

中文翻译：

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基于生物咖啡酸的花状纳米银的制备用于拉曼增强和染料降解

在这项研究中，使用植物源咖啡酸作为还原剂和聚乙烯吡咯烷酮作为还原剂，开发了一种简单、绿色、低成本的室温合成西兰花状银纳米花（AgNF）的方法，其粒径约为300-500 nm。超声波辅助下的分散剂。 20-50 nm 的小纳米晶体覆盖的花簇显着增强了电磁场信号。 AgNF 沉积在硅片表面，作为表面增强拉曼光谱传感器，用于检测罗丹明 6G (R6G) 和孔雀石绿等探针分子，具有高灵敏度、均匀性和重现性。 AgNF以复合材料的形式沉积在棉织物上，在硼氢化钠存在下催化R6G、MG和甲基橙等染料污染物的降解。 0.1 g AgNF/棉织物可辅助15 mmol/L NaBH ₄在12 min内实现各种染料90%以上的降解，且染料浓度较高，具有良好的重复使用性和可回收性。这项工作中合成的AgNF不仅可以监测废水中污染物（染料）的类型和数量，还可以催化染料的快速降解，预计具有工业应用价值。