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SEM image of (a) initial PS; (b) PEI@PS; (c) NPs@PEI@PS; (d) NPs@PEI@PS with PVPpassivation; (e) LIBS-PS with silica coating; (f) EDS image of the distribution of NPs (ZnO) assembled on LIBS-PS. Scale bars are 2 μm for all images.
