Fig. 2From: A dual-quenched ECL immunosensor for ultrasensitive detection of retinol binding protein 4 based on luminol@AuPt/ZIF-67 and MnO2@CNTsA Low-magnification and B high-magnification TEM image of CNTs. D Low-magnification and E high-magnification TEM image of MnO2@CNTs. XRD pattern of C CNTs and F MnO2@CNTs. G HAADF image and H–K STEM-EDS elemental mappings of MnO2@CNTs compositesBack to article page