Fig. 1From: Magnetic Assembly Route to Construct Reproducible and Recyclable SERS SubstrateThe SEM and TEM images of (a, e, i) Fe3O4, (b, f, j) Fe3O4@SiO2, (c, g, k) Fe3O4@SiO2@TiO2, and (d, h, l) Fe3O4@SiO2@TiO2@Ag microspheres, respectivelyBack to article page