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Shell-thickness-modulated electrochemiluminescence of colloidal quantum dots for ultrasensitive PSA detection
Yawen Luo1, Xingchang Lu2, Liangshi Hao3
1School of Physics and Optoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
Optimizing colloidal quantum dot (QD) core/shell structure enhances electrochemiluminescence (ECL) biosensor performance. Tailored CdSe/CdS/ZnS QDs with optimized shells provide superior stability and efficiency for sensitive prostate-specific antigen detection in clinical diagnostics.
Area of Science:
- Materials Science
- Analytical Chemistry
- Nanotechnology
Background:
- Colloidal quantum dots (QDs) offer potential for electrochemiluminescence (ECL) biosensors but require optimization for stability and efficiency in biological samples.
- Understanding the influence of core/shell architecture on QD wavefunction and ECL behavior is crucial for advancing biosensing technology.
Purpose of the Study:
- To investigate how core/shell architecture, specifically intermediate shell thickness, impacts the ECL response and stability of QDs.
- To develop a high-performance QD-based ECL aptasensor for sensitive and reliable clinical diagnostics.
Main Methods:
- Systematic modulation of CdS intermediate shell thickness in CdSe/CdS/ZnS core/shell/shell QDs.
- Evaluation of QD stability against electrochemical degradation and ECL intensity.
- Development of a "signal-on" ECL aptasensor using optimized QDs and gold nanorods for prostate-specific antigen (PSA) detection.
Main Results:
- Asymmetric carrier distribution in QDs leads to geometry-dependent ECL response.
- Optimized CdS shell thickness (five monolayers) balances QD stability and ECL efficiency.
- The developed aptasensor achieved a wide linear range (1.0 pg/mL to 10 ng/mL), low detection limit (0.51 pg/mL), and reliable performance in serum samples.
Conclusions:
- Rational design of QD core/shell architecture is key to achieving high-performance ECL emitters for biosensing.
- Optimized QD-based ECL systems offer a promising platform for sensitive and stable clinical diagnostic tools.
