期刊
SENSORS
卷 20, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/s20092455
关键词
biosensor; esophageal cancer; photoelectrochemical; semiconductor heterostructure
资金
- Ministry of Science and Technology of Taiwan [MOST 105-2923-E-194-003-MY3, 106-2112-M-194-002, 108-2823-8-194-002]
- Advanced Institute of Manufacturing with High-tech Innovations (AIM-HI) from The Featured Areas Research Center Program by the Ministry of Education (MOE) in Taiwan
- Kaohsiung Armed Forces General Hospital research project [107-17]
A highly sensitive photoelectrochemical (PEC) biosensor without external bias was developed in this study. The biosensor was configured with a p-Cu2O and n-ZnO heterostructure. Hexamethylenetetramine (HMTA) and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) was used to improve the crystal structure of Cu2O and ZnO and reduce the defects in the Cu2O/ZnO interface. This fabrication method provided the highly crystallized Cu2O/ZnO structure with excellent electrical property and photoresponse in visible light. The structure was applied to a biosensor for detecting two different cancerous levels of esophageal cells, namely, OE21 and OE21-1, with a high gain in photocurrent (5.8 and 6.2 times, respectively) and a low detection limit (3000 cells in 50 mu L). We believe that such a p-n heterojunction PEC biosensor could advance biosensor development and provide a promising candidate for biomedical applications.
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