Journal
ANALYTICA CHIMICA ACTA
Volume 1233, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.aca.2022.340496
Keywords
Photoelectrochemical; Alginate; Eu3+; CdS; Quantum dots; Hg2+
Categories
Funding
- National Natural Sci- ence Foundation of China
- Natural Science Foundation of Shandong Province
- Shandong Provincial Key Research and Development Program
- [51973102]
- [ZR2019MB051]
- [ZR2019MB067]
- [2018GGX102001]
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Trace analysis of mercury ions is important for human health and environmental protection. This work developed a novel photoelectrochemical biosensor for ultrasensitive detection of Hg2+. It utilized a composite/CdS quantum dots as the photoactive substrate material and immobilized thymidine-rich probe DNA on the surface to enable selective detection of Hg2+ with a low detection limit.
Trace analysis of mercury ions (Hg2+) is of great significance to human health and environmental protection. In this work, a novel photoelectrochemical (PEC) biosensor was developed for the ultrasensitive detection of Hg2+ based on the MOFs-like composite/CdS quantum dots (QDs) as photoactive substrate materials. The MOFs-like composite in situ formed by hydrophobically modified alginate (HMA) with europium ion (Eu3+) not only offered a friendly platform for bioconjugation but also resulted in enhancing sensor photocurrent response. Furthermore, the immobilized thymidine-rich probe DNA on the MOFs-like composite surface was bent to produce a T-Hg2+-T structure in the presence of Hg2+, resulting in enlarged steric hindrance on the electrode surface and decreased the proposed biosensor PEC response. This proposed photoelectrochemical sensing system displayed selective detection of Hg2+ with a linear range from 0.1 pM to 1.0 mu M with a detection limit of 0.067 pM. The utilization of semiconductor quantum dots as light-harvesting components and the MOFs-like composite as sensitizers broadens the possible design ideas for photoelectrochemical sensing systems.
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