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CuInS2/Red Phosphorus Nanosheet Interleaved Heterostructures with Improved Interfacial Charge Transfer for Photoelectrochemical Aptasensing
- Source :
- Analytical Chemistry; 20240101, Issue: Preprints
- Publication Year :
- 2024
-
Abstract
- Accelerating the migration of interfacial carriers in heterojunctions is crucial for achieving highly sensitive photoelectrochemical (PEC) sensing. In this study, we developed three-dimensional (3D)/two-dimensional (2D) CuInS2/red phosphorus nanosheet (CuInS2/RP NS) n–n heterojunction functional materials with enhanced interfacial charge transfer capabilities for PEC sensing. The 3D CuInS2serves as a conductive layer, providing excellent electronic conductivity and superior electron absorption and transport properties. In contrast, the ultrathin RP NS acts as a transport layer that enhances carrier mobility. The 3D/2D heterojunction ensures a large interface contact surface, shortening the carrier transport distance. A well-aligned band position generates a substantial built-in electric field, providing a significant driving force for efficient carrier separation and migration, thereby improving response sensitivity. A PEC aptamer sensor was constructed based on the synthesized heterostructure for ciprofloxacin detection. The detection limit of the CuInS2/RP NS aptamer sensor for ciprofloxacin is 2.03 × 10–15mg·mL–1, with a linear range from 1.0 × 10–14to 1.0 × 10–5mg·mL–1. This work presents a strategy for enhancing the photoelectric response by modulating the interface structure of heterojunctions, thereby opening new prospects for the application of highly sensitive PEC sensors in antibiotic detection.
Details
- Language :
- English
- ISSN :
- 00032700 and 15206882
- Issue :
- Preprints
- Database :
- Supplemental Index
- Journal :
- Analytical Chemistry
- Publication Type :
- Periodical
- Accession number :
- ejs66885807
- Full Text :
- https://doi.org/10.1021/acs.analchem.4c01917