Core/shell Fe 3 O 4 −Au/silica nanoparticles with controllable fluorescein doped into nanoporous silica shells are synthesized. The quantum yield of fluorescein significantly increases through a synthetic electromagnetic field coupling of the dumbbell-like Fe 3 O 4 −Au cores. Theoretical simulation further proves that the anomalously plasmonic oscillation of Fe 3 O 4 −Au nanoparticles is a dominant contributor to the fluorescence enhancement.
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Zhang et al. (2010) studied this question.
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