Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 880, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2020.114828
Keywords
Photoelectrochemical aptasensor; ZnO-CdS; CdSe QDs; Co-sensitive structure; Lead ion
Categories
Funding
- National Natural Science Foundation of China [21874115, 21675136]
- Zhongyuan Thousand Talents Program of Henan Province [ZYQR201912127, ZYQR201912177]
- Science & Technology Innovation Talents in Universities of Henan Province [18HASTIT003]
- Nanhu Young Scholar Supporting Program of XYNU
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A novel photoelectrochemical aptasensor for lead ion detection was developed based on a CdSe quantum dots co-sensitized ZnO-CdS nanostructure and the specificity of aptamer, showing a linear response and good detection limit. The sensor can detect lead ions in environmental water samples with high selectivity.
A novel photoelectrochemical (PEC) aptasensor for lead ion (Pb2+) detection was proposed on the basis of the CdSe quantum dots (QDs) co-sensitized ZnO-CdS nanostructure and the specificity of aptamer. The CdSe QDs-capped cDNA, as a signal enhancement element, could hybridize with the aptamer on the sensing platform to generate a CdSe/CdS/ZnO dual co-sensitized structure, realizing a great enhancement in photocurrent response. In the presence of Pb2+, the aptamer on the sensing interface specifically bound with the Pb2+ to form G-quadruplex structures, which greatly inhibit the hybridization between aptamer and CdSe QDs-cDNA, leading to a decrement of the photocurrent signal. As the concentration of Pb2+ increased, the photocurrent response showed a diminishing tendency. Under the optimized conditions, the fabricated PEC aptasensor exhibited a linear response between photocurrent variation and the logarithm of Pb2+ concentration in the scope of 1.0 ? 10?9 M to 1.0 ? 10?5 M with a detection limit of 3.4 ? 10?10 M. Moreover, the aptasensor has been applied in the determination of Pb2+ in environmental water samples with the good selectivity.
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