期刊
NEW JOURNAL OF CHEMISTRY
卷 41, 期 4, 页码 1582-1590出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nj03335k
关键词
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资金
- National Natural Science Foundation of China [61378038]
- Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology [2014FXZY003]
- Dean Foundation of Hefei Institute of Physical Science, CAS [YZJJ201514]
- State Key Laboratories of Transducer Technology
Fe3O4@ SiO2@ Ag magnetic-plasmonic nanospindles with efficient SERS performance and magnetic responsiveness have been successfully fabricated. Uniform and monodispersed Fe3O4@ SiO2 nanospindles were prepared by a robust strategy through annealing the obtained beta-FeOOH@ SiO2 nanospindles in hydrogen atmospheres at 350 degrees C; the SiO2 shell could be regarded as an interlayer to maintain the morphology and offer a solid support for the further growth of Ag nanoparticles. Ag nanoparticles were introduced via in situ reduction of AgNO3, and the coverage rate of Ag nanoparticles anchored on Fe3O4@ SiO2 was adjusted through regulating the AgNO3 concentration. Fe3O4@ SiO2@ Ag magnetic-plasmonic nanospindles can serve as highly efficient SERS active substrates with controllable magnetic aggregation due to steady enrichment of mass molecules in close proximity to abundant hot spots. Moreover, these nanospindles are used for label-free detection of thiram, and the detection limit is as low as 1 x 10(-7) M (about 0.024 ppm), which is lower than the maximal residue limit of 7 ppm in fruits prescribed by the U. S. Environmental Protection Agency. Therefore, such magnetic-plasmonic nanospindles in the magnetic aggregation state may be potentially applied in rapid trace detection of residual pesticides or other specific analytes.
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