Fig. 1From: Multi-carbon dots and aptamer based signal amplification ratiometric fluorescence probe for protein tyrosine kinase 7 detectiona The TEM images of Fe3O4 MNPs. b The SEM images of Fe3O4 MNPs. c The TEM image of b-CDs, Insert: high-resolution TEM image of b-CDs. d The TEM image of y-CDs, Insert: high-resolution TEM image of y-CDsBack to article page