Journal
NANOSCALE
Volume 11, Issue 25, Pages 12198-12209Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr03004b
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Funding
- National Natural Science Foundation of China [51579096, 51521006, 51222805]
- Key Research and Development Program of Hunan Province of China [2017SK2241]
- National Innovative Talent Promotion Program of China [2017RA2088]
- National Program for Support of Top-North Young Professionals of China
- Hunan Province Cooperative Innovation Center for The Construction AMP
- Development of Dongting Lake Ecological Economic Zone
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Based on the unique photoelectrochemical properties of a CoO/Au/g-C3N4 Z-scheme heterojunction, a self-powered photoelectrochemical (PEC) aptasensor was constructed for the detection of microcystin-leucine arginine (MC-LR). Z-scheme heterojunctions can promote the separation of a photo-induced electron-hole pair, and the surface plasmonic resonance (SPR) of Au nanoparticles can significantly enhance the adsorption of visible light. Importantly, MC-LR molecules were captured by aptamers initially immobilized on the modified electrode due to their high affinity, and then oxidized by the photogenerated holes, which caused an amplified photocurrent signal, allowing the quantitative analysis of MC-LR by measuring the photocurrent intensity change. This PEC MC-LR aptasensor showed high sensitivity and selectivity within a wide linear response range from 0.1 pM to 10 nM and a detection limit of 0.01 pM. The application of this sensor in the analysis of lake water samples provided accurate results with a relative standard deviation (RSD) of 2.6%-4.2%.
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