Figure 9.

Resonance energy transfer based photoelectrochemical biosensors: (A) Energy transfer between CdS QDs and Ag NPs upon the ALP induced Ag deposition on Au NPs [Reprinted from Ma et al. (2016b) with permission from American Chemical Society]. (B) Tata binding protein bends the double-stranded DNA structure and brings CdS QD and Au NPs closer [Reprinted from Ma et al. (2016a) with permission from American Chemical Society]. (C) Schematic illustration of the signal-off sandwich type immunoassay was developed by using CuS nanocrystals as photocurrent quencher for early detection of CEA [Reprinted from Fan et al. (2016b) with permission from American Chemical Society]. (D) Thrombin detection using a PEC aptasensing platform based on exciton energy transfer between CdSeTe alloyed quantum dots and SiO₂@Au nanocomposites. In this approach, RET significantly reduces the photocurrent, which is then quickly restored following the target's competitive binding and subsequent release of the metal NP tagged capture probe [Reprinted from Fan et al. (2015) with permission from The Royal Society of Chemistry].