Programmable DNA Circuits for Flexible and Robust Exciton–Plasmon Interaction-Based Photoelectrochemical Biosensing

DNA circuits as one of the dynamic nanostructures can be rationally designed and show amazing geometrical complexity and nanoscale accuracy, which are becoming increasingly attractive for DNA entropy-driven amplifier design. Herein, a novel and elegant exciton–plasmon interaction (EPI)-based photoel...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2021-08, Vol.93 (31), p.11043-11051
Main Authors: Li, Hongbo, Cao, Ye, Wu, Tianyu, Zhang, Yansong, Zheng, Zhaoting, Lv, Jingchun, Mao, Airong, Zhang, Yuye, Tang, Qin, Li, Jing
Format: Article
Language:English
Subjects:
Amplifier design
Amplifiers
Biosensors
Cadmium selenides
Chemistry
Circuit design
Deoxyribonucleic acid
Design
DNA
Efficiency
Electrodes
Entropy
Excitons
Fabrication
Geometric accuracy
Gold
Hybridization
Iron oxides
Liquid-solid interfaces
miRNA
Nanoparticles
Nanostructure
Photoelectric effect
Photoelectric emission
Quantum dots
Selectivity
Silicon dioxide
Thermal stability
Zinc sulfide
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Summary:DNA circuits as one of the dynamic nanostructures can be rationally designed and show amazing geometrical complexity and nanoscale accuracy, which are becoming increasingly attractive for DNA entropy-driven amplifier design. Herein, a novel and elegant exciton–plasmon interaction (EPI)-based photoelectrochemical (PEC) biosensor was developed with the assistance of a programmable entropy-driven DNA amplifier and superparamagnetic nanostructures. Low-abundance miRNA-let-7a as a model can efficiently initiate the operation of the entropy-driven DNA amplifier, and the released output DNAs can open the partially hybridized double-stranded DNA anchored on Fe3O4@SiO2 particles. The liberated Au nanoparticles (NPs)-cDNA can completely hybridize with CdSe/ZnS quantum dots (QDs)-cDNA-1 and result in proportionally decreased photocurrent of CdSe/ZnS QDs-cDNA-1. This unique entropy-driven amplification strategy is beneficial for reducing the reversibility of each step reaction, enables the base sequence invariant and the reaction efficiency improvement, and exhibits high thermal stability and specificity as well as flexible design. These features grant the PEC biosensor with ultrasensitivity and high selectivity. Also, instead of solid–liquid interface assembly for conventional EPI-based PEC biosensors, herein, DNA hybridization in the solution phase enables the improved hybridization efficiency and sensitivity. In addition, superparamagnetic Fe3O4@SiO2 particles further ensure the enhancement of the selectivity and reliability of the as-designed PEC biosensor. Particularly, this single-step electrode modification procedure evidently improves the electrode fabrication efficiency, reproducibility, and stability.
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.1c02488