A Branched Rutile/Anatase Phase Structure Electrode with Enhanced Electron-Hole Separation for High-Performance Photoelectrochemical DNA Biosensor

A photoelectrochemical (PEC) detection platform was built based on the branched rutile/anatase titanium dioxide (RA-TiO2) electrode. Theoretical calculations proved that type-II band alignment of rutile and anatase could facilitate charge separation in The self-generated electric field at interface two phases can enhance electron transfer efficiency Carboxylated CdTe quantum dots (QDs) were applied as signal amplification factors. Without target DNA presence, QDs riveted to surface electrode by hairpin probe DNA. sensitization increased photocurrent significantly. When present, structural changes resulted failure sensitized structure. Benefiting from excellent structure design strategy, PEC assays achieve highly sensitive specific range 1 fM nM, with a limit 0.23 fM. construction method proposed this article open new avenue for preparation more efficient sensing devices.