Highly Sensitive and Reproducible SERS Performance from Uniform Film Assembled by Magnetic Noble Metal Composite Microspheres

详细信息    查看全文

• 作者：Chunyu Niu ; Bingfang Zou ; Yongqiang Wang ; Lin Cheng ; Haihong Zheng ; Shaomin Zhou
• 刊名：Langmuir
• 出版年：2016
• 出版时间：January 26, 2016
• 年：2016
• 卷：32
• 期：3
• 页码：858-863
• 全文大小：426K
• ISSN：1520-5827

文摘

To realize highly sensitive and reproducible SERS performance, a new route was put forward to construct uniform SERS film by using magnetic composite microspheres. In the experiment, monodisperse Fe₃O₄@SiO₂@Ag microspheres with hierarchical surface were developed and used as building block of SERS substrate, which not only realized fast capturing analyte through dispersion and collection under external magnet but also could be built into uniform film through magnetically induced self-assembly. By using R6G as probe molecule, the as-obtained uniform film exhibited great improvement on SERS performance in both sensitivity and reproducibility when compared with nonuniform film, demonstrating the perfect integration of high sensitivity of hierarchal noble metal microspheres and high reproducibility of ordered microspheres array. Furthermore, the as-obtained product was used to detect pesticide thiram and also exhibited excellent SERS performance for trace detection.