Han Donglai, Li Boxun, Chen Yue, Wu Tong, Kou Yichuan, Xue Xiaojing, Chen Lei, Liu Yang, Duan Qian
School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, People's Republic of China. Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun 130022, People's Republic of China.
Nanotechnology. 2019 Nov 15;30(46):465703. doi: 10.1088/1361-6528/ab3a84. Epub 2019 Sep 2.
The FeO@Au core-shell nanocomposites, as the multifunctional magnetic surface enhanced Raman scattering (SERS) substrates, were fabricated successfully by the seeds growth method based on the FeO-Au core-satellite nanocomposites. The SERS properties of the FeO-Au core-satellite nanocomposites and the FeO@Au core-shell nanocomposites were compared using 4-aminothiophenol (4-ATP) as the probe molecule. It was found that FeO@Au core-shell nanocomposites showed better SERS performance than FeO-Au core-satellite nanocomposites. The Au shell provided an effectively large surface area for forming sufficient plasmonic hot spots and capturing target molecules. The integration of magnetic core and plasmonic Au nanocrystals endowed the FeO@Au core-shell nanocomposites with highly efficient magnetic separation and enrichment ability and abundant interparticle hot spots. The FeO@Au core-shell nanocomposites could be easily recycled because of the intrinsic magnetism of the FeO cores and had good reproducibility of the SERS signals. For practical application, the FeO@Au core-shell nanocomposites were also used to detect thiram. There was a good linear relationship between the SERS signal intensity and the concentration of thiram from 1 × 10 to 1 × 10 M and the limit of detection was 7.69 × 10 M. Moreover, residual thiram on apple peel was extracted and detected with a recovery rate range of 99.3%. The resulting substrate with high SERS activity, stability and strong magnetic responsivity makes the FeO@Au core-shell nanocomposites a perfect choice for practical SERS detection applications.
基于FeO-Au核-卫星纳米复合材料，通过种子生长法成功制备了FeO@Au核壳纳米复合材料，作为多功能磁性表面增强拉曼散射（SERS）基底。以4-氨基硫酚（4-ATP）为探针分子，比较了FeO-Au核-卫星纳米复合材料和FeO@Au核壳纳米复合材料的SERS性能。结果发现，FeO@Au核壳纳米复合材料的SERS性能优于FeO-Au核-卫星纳米复合材料。金壳为形成足够的等离子体热点和捕获目标分子提供了有效的大表面积。磁性核与等离子体金纳米晶体的结合赋予了FeO@Au核壳纳米复合材料高效的磁分离和富集能力以及丰富的粒子间热点。由于FeO核的固有磁性，FeO@Au核壳纳米复合材料易于回收，并且SERS信号具有良好的重现性。在实际应用中，FeO@Au核壳纳米复合材料还用于检测福美双。SERS信号强度与福美双浓度在1×10至~1×10 M之间存在良好的线性关系，检测限为7.69×10 M。此外，对苹果皮上的残留福美双进行了提取和检测，回收率范围为99.3%。所得具有高SERS活性、稳定性和强磁响应性的基底使FeO@Au核壳纳米复合材料成为实际SERS检测应用的理想选择。
