Dual Z-scheme In2S3/Bi2S3/ZnS heterojunction with broad-spectrum response as a photoactive material for ultrasensitive detection of environmental Pollutant tetracycline
1Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, Chongqing Engineering Laboratory of Nanomaterials & Sensor Technologies, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, PR China.
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Summary
A novel dual Z-scheme heterojunction biosensor was developed for ultrasensitive detection of tetracycline (TC) in environmental samples. This advanced photoelectrochemical (PEC) biosensor offers a highly sensitive method for monitoring antibiotic pollution.
Area of Science:
- Materials Science
- Analytical Chemistry
- Environmental Science
Background:
- Environmental pollution by antibiotics like tetracycline (TC) poses a significant threat.
- Existing photoelectrochemical (PEC) biosensors often suffer from low sensitivity and background noise.
- Developing highly sensitive and reliable methods for TC detection is crucial for environmental monitoring and food safety.
Purpose of the Study:
- To develop a novel dual Z-scheme heterojunction In2S3/Bi2S3/ZnS (IBZS) with a core-shell structure for enhanced PEC performance.
- To establish a highly sensitive PEC biosensor for the ultrasensitive detection of tetracycline (TC).
- To mitigate the DNA duplex breathing effect and suppress background noise for improved detection accuracy.
Main Methods:
- Fabrication of a dual Z-scheme heterojunction IBZS material with a core-shell structure.
- Construction of a PEC biosensor utilizing the IBZS material.
- Implementation of a target-triggered entropy-driven DNA reaction (TEDR) strategy to enhance signal-to-noise ratio.
- Optimization of the PEC detection parameters for TC analysis.
Main Results:
- The dual Z-scheme heterojunction IBZS exhibited a strong PEC response due to broad-spectrum absorption and efficient carrier migration.
- The redesigned TEDR effectively suppressed nonspecific background noise, significantly enhancing detection sensitivity.
- The developed PEC biosensor achieved ultrasensitive detection of TC in the range of 1.0 fM to 10 nM.
- An exceptionally low detection limit of 0.54 fM for TC was achieved, surpassing current methods.
Conclusions:
- The novel dual Z-scheme heterojunction IBZS material and TEDR strategy provide a high-performance PEC biosensor for ultrasensitive TC detection.
- This approach offers a promising new avenue for designing advanced PEC photoactive materials for environmental pollution monitoring.
- The developed biosensor is expected to be valuable for analyzing antibiotics in environmental samples and ensuring food quality control.