Facile solvothermal synthesis of Ag/Fe3O4 nanocomposites and their SERS applications in on-line monitoring of pesticide contaminated water
Facile solvothermal synthesis of Ag/Fe3O4 nanocomposites and their SERS applications in on-line monitoring of pesticide contaminated water
复制标题
DOI：
10.1039/c5ra17606a
复制
发表时间：
2015-11
期刊：
影响因子：
3.9
通讯作者：
Yufeng Shan;Yong Yang;Yanqin Cao;Zhengren Huang
中科院分区：
文献类型：
--
作者：
Yufeng Shan;Yong Yang;Yanqin Cao;Zhengren Huang
贵金属和磁性材料的纳米复合材料同时具有SERS活性和磁性，因此在分析化学、生物和环境科学领域的痕量分析中具有巨大的优势。在这项工作中，通过简便的一锅溶剂热法获得了 Ag/Fe3O4 纳米复合材料。与Ag复合的Fe3O4纳米颗粒（NPs）具有优异的超顺磁性，保证了Ag/Fe3O4复合材料的有效自聚集。通过调整油酸银和油酸铁的摩尔比，可以轻松优化所制备的纳米复合材料的饱和磁矩和SERS活性。 Ag/Fe = 5 的样品对于 R6G 和 MB 检测均具有最佳的 SERS 性能。超小尺寸的Fe3O4纳米粒子就像胶水或收缩网一样，在外部磁场作用下将Ag纳米粒子包裹在一起，产生高密度和高强度的“热点”。 Ag/Fe = 5 的样品对于 R6G 和 MB 检测的增强因子 (EF) 均超过 ∼108。所制备的磁性纳米复合材料已用于实现流动农药污染水中莠去津的高效便捷的实时在线监测，在工农业生产在线监测中显示出巨大的应用潜力。
Nanocomposites of noble metal and magnetic materials deliver both SERS activity and magnetic properties, and thereby have great advantages for trace analysis in the fields of analytical chemistry, biological and environmental sciences. In this work, Ag/Fe3O4 nanocomposites have been obtained by a facile one-pot solvothermal method. The Fe3O4 nanoparticles (NPs) compounded with Ag possess excellent superparamagnetism, which guarantees an effective self-aggregation of the Ag/Fe3O4 composites. The saturation magnetic moment and SERS activity of the as-prepared nanocomposites are easily optimized by adjusting the mole ratio of silver oleate and iron oleate. The sample with Ag/Fe = 5 possesses optimal SERS performance for both R6G and MB detection. The Fe3O4 NPs with ultra small size behave just like glue or a contractile net, which wrap the Ag NPs together under an external magnetic field and give rise to high-density and high-intensity “hot-spots”. The enhancement factors (EFs) of the sample with Ag/Fe = 5 are over ∼108 both for R6G and MB detection. The as-prepared magnetic nanocomposites have been applied to realize an efficient but convenient real-time on-line monitoring of atrazine in flowing pesticide contaminated water, which show enormous potential in the application of on-line monitoring for industrial and agricultural production.