Figure 7

EDX elemental mapping analysis. Inset: FESEM micrograph of DNA biosensor; (a) silica nanospheres (SiNSs) with gold nanoparticles (AuNPs); (b) SiNSs, AuNPs, glutaraldehyde; (c) after immobilization with DNA probe; (d) after hybridisation with complementary DNA; (e) after intercalation with HexaFc.