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A novel kind of yolk–shell microspheres was presented in this Letter. First, 250 nm of magnetic Fe3O4 nanoparticles was prepared by solvothermal reaction. Then, the Fe3O4 particles were coated with Au nanoparticles (AuNPs), SiO2, and poly(N-isopropylacrylamide) (PNIPAM). After the removal of the SiO2 layer by etching with HF solution, the yolk–shell microspheres were prepared. Each yolk–shell microsphere...
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