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. 2019 Feb 6;9(2):209. doi: 10.3390/nano9020209

Figure 2.

Figure 2

TEM image of MNPs@SiO2 (a), TEM image of MNPs@SiO2@GOPTS-bPEI (b), and representative SEM image of MNPs@SiO2@GOPTS-bPEI (c). Note that darker spots in the TEM images correspond to the bare MNPs that overlap when deposited onto the copper grid.