期刊
BIOSENSORS & BIOELECTRONICS
卷 121, 期 -, 页码 19-26出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2018.08.042
关键词
Self-powered; Photoelectrochemical aptasensor; g-C3N4; Phosphorus doping; Au nanoparticles; Oxytetracycline
类别
资金
- National Natural Science Foundation of China [51579096, 51521006, 51409024]
- Key Research and Development Program of Hunan Province of China [2017SK2241]
- National Program for Support of Top-Notch Young Professionals of China
- Hunan Province Cooperative Innovation Center for The Construction & Development of Dongting Lake Ecological Economic Zone
This work reports a facile and sensitive self-powered cathodic photoelectrochemical (PEC) aptasensor for the detection of oxytetracycline (OTC) based on Au nanoparticles-decorated phosphorus-doped porous ultrathin g-C3N4 nanosheets (Au/PCN-S). The prepared PCN-S possesses large specific surface area with abundant in-plane pores on its surface, ideal biocompatibility, and excellent visible light response. The in situ photo-reduced Au nanoparticles further enhanced the PEC performance owing to its unique surface plasmon resonance (SPR) effect. Under visible light irradiation, the photocurrent of Au/PCN-S composites was significantly enhanced, which was about 22 times higher than that of pure g-C3N4. In the self-powered PEC biosensing of OTC, the device exhibited high sensitivity toward the presence of dissolved oxygen in the electrolyte and presented a wide detection range from 0.5 to 200 nM and a detection limit of 0.34 nM, as well as certain selectivity, reproducibility and stability. The proposed Au/PCN-S nanocomposites would be considered as a promising visible light responsive photoactive material for fabrication of PEC biosensors with high performance.
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