Journal
LANGMUIR
Volume 32, Issue 3, Pages 858-863Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.5b03802
Keywords
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Funding
- Natural Science Foundation of China [51372070]
- Research Foundation of Henan University [0000A40409]
- Program for Science & Technology Innovation Talents in University of Henan Province [16HASTIT009]
- Research Foundation for Young Scholar of Henan Province [2014GGJS-022]
- Changjiang Scholars and Innovative Research Team in University [PCS IRT15R18]
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To realin 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.
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