Figure 4

Schematic illustration of 3D structured DNA probes. Electrochemical DNA (E-DNA) sensor: (A) tetrahedron-structured DNA probe (adapted from Pei et al.88); (B) tetrahedron-structured DNA probe with enzyme-based signal amplification (adapted from Wen et al.89). Fluorescent DNA (F-DNA) sensor: (C) tetrahedron-structured DNA probe for small molecule detection (adapted from Qu et al.94); (D) tetrahedron-structured DNA probe for sensing metal ions (Hg2+) (adapted from Qu et al.95). (E) Self-assembly of methane-like NP-molecules (adapted from Li et al.97).

© De Gruyter