Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 339, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.129871
Keywords
Flexible electrode; Carbon paper; PEC sensor; Br doped PEDOT; Mass production; Mercury
Funding
- Key R&D Program of Jiangsu Province [BE2020677]
- National Natural Science Foundation of China [21675066, 31901799]
- Foundation of Key Laboratory of Sensor Analysis of Tumor Marker, Ministry of Education, Qingdao University of Science and Technology [SATM201807]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [19KJB550006]
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The study successfully developed a PEC sensing platform for Hg2+ detection by fabricating a Br doped PEDOT modified carbon paper electrode, which exhibited excellent performance. The sensor showed high sensitivity, good stability, and strong selectivity, making it suitable for the determination of mercury ions in river water samples and other environments.
Mercury (Hg) is a kind of the most common heavy metals with high toxicity in nature, existing in water, soil, and even food. Hence, it is of great importance to develop a simple, effective way to detect Hg2+. Flexible sensing has attracted extensive attention in recent years, which can be flexibly applied in various detection environments. Poly(3,4-ethylenedioxythiophene) (PEDOT) with conjugation structure which can accelerate the transfer of electrons and inhibit the recombination of carriers is favorable to the photoelectrochemical (PEC) process. Here, Br doped PEDOT modified carbon paper with narrower bandgap was firstly fabricated through situ thermal polymerization which exhibited high photocurrent intensity under visible-light irradiation. The success synthesis of PEDOT was confirmed by SEM, XPS, FT-IR and Raman spectrum. Meanwhile, the as-prepared electrode can be mass produced with good reproducibility. Based on excellent performance of as-prepared electrode of Br doped PEDOT/carbon paper, we constructed a PEC sensing platform for Hg2+ detection with the detection limit of 0.3 nM and linear range from 1 nM to 450 nM. In addition, the PEC sensor exhibited speedy response, outstanding stability, excellent selectivity, wide linear range, and was used for determination of Hg2+ in river water samples with recover range of 97.7?104.5 % and RSD of 2.8?4.7 %.
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