Figure 7From: Facile synthesis of folate-conjugated magnetic/fluorescent bifunctional microspheres The zeta potential of as-prepared samples at pH =7.0: (a) naked Fe 3 O 4 NPs, (b) CS-coated Fe 3 O 4 NPs, (c) CdTe-CS-coated Fe 3 O 4 NPs, and (d) Fe 3 O 4 -CdTe@SiO 2 -NH 2 NPs. Back to article page