Ternary Z-scheme heterojunction of Bi SPR-promoted BiVO4/g-C3N4 with effectively boosted photoelectrochemical activity for constructing oxytetracycline aptasensor

Yuhuan Xu; Zuorui Wen; Tianshuo Wang; Meng Zhang; Caifeng Ding; Yingshu Guo; Ding Jiang; Kun Wang

doi:10.1016/j.bios.2020.112453

Ternary Z-scheme heterojunction of Bi SPR-promoted BiVO₄/g-C₃N₄ with effectively boosted photoelectrochemical activity for constructing oxytetracycline aptasensor

Biosens Bioelectron. 2020 Oct 15:166:112453. doi: 10.1016/j.bios.2020.112453. Epub 2020 Jul 18.

Authors

Yuhuan Xu¹, Zuorui Wen¹, Tianshuo Wang¹, Meng Zhang¹, Caifeng Ding², Yingshu Guo³, Ding Jiang⁴, Kun Wang⁵

Affiliations

¹ Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, PR China.
² Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, OE, School of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China.
³ Collaborative Innovation Center of Tumor Marker Detection Technology, Equipment and Diagnosis-Therapy Integration in Universities of Shandong, Shandong Province Key Laboratory of Detection Technology for Tumor Makers, School of Chemistry and Chemical Engineering, Linyi University, Linyi, 276005, PR China. Electronic address: yingshug@126.com.
⁴ School of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu, 213164, PR China. Electronic address: jiangding0323@163.com.
⁵ Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, PR China; Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, OE, School of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China. Electronic address: wangkun@ujs.edu.cn.

PMID: 32862845
DOI: 10.1016/j.bios.2020.112453

Abstract

Developing photoactive materials with wide spectral response is critical to improve the sensitivity of PEC biosensors. Herein, a sensitive photoelectrochemical (PEC) aptasensor was fabricated based on Bi surface plasmon resonance (SPR)-promoted BiVO₄/g-C₃N₄ (Bi/BiVO₄/g-C₃N₄) as photoactive material for the detection of oxytetracycline (OTC). Ternary Z-scheme Bi/BiVO₄/g-C₃N₄ heterojunction exhibited widest spectral response and best PEC activity compared to g-C₃N₄, BiVO₄, Bi/BiVO₄, and BiVO₄/g-C₃N₄. The wide spectral response and high PEC activity could be attributed to three reasons: Firstly, the SPR effect of Bi could greatly increase light harvesting; Secondly, Bi served as an electron conduction bridge between BiVO₄ and g-C₃N₄ to form Z-scheme structure, significantly accelerating the separation of photogenerated carriers; Thirdly, the synergism of Z-scheme heterojunction and the SPR effect of Bi efficiently boosted the photoelectric response. Based on the above sensitization strategies, the proposed PEC aptasensor for OTC determination showed a wide linear range of 0.01-1000 nM and a low detection limit (S/N = 3) of 3.3 × 10^-3 nM. Moreover, the high stability, satisfactory repeatability and favorable practicability of the fabricated PEC aptasensor revealed the potential applications for accurate monitoring of antibiotics in environmental media.

Keywords: Oxytetracycline; Photoelectrochemical aptasensor; Surface plasmon resonance; Ternary heterojunction; Z-scheme.

MeSH terms

Aptamers, Nucleotide*
Biosensing Techniques*
Electrochemical Techniques
Oxytetracycline*
Surface Plasmon Resonance

Substances

Aptamers, Nucleotide
Oxytetracycline