检出限
异质结
材料科学
表面等离子共振
灵敏度(控制系统)
光电子学
电场
化学
纳米技术
物理
纳米颗粒
电子工程
量子力学
色谱法
工程类
作者
Yanmei Xin,Zhuo Wang,Haizi Yao,Wanting Liu,Yuqing Miao,Zhonghai Zhang,Dan Wu
标识
DOI:10.1016/j.snb.2023.134285
摘要
Accurate detection of L-Cysteine (Cyst) is critical because it is a recognized marker associated with diseases such as liver damage and kidney failure. Photoelectrochemical (PEC) sensor is an emerging strategy for biochemical analysis. However, the sensitivity of PEC sensor is limited by the high recombination rate of photogenerated electron-hole pairs. In this study, Au-mediated Z-scheme TiO2-Au-BiOI (HTNTs-Au-BOI) photoelectrochemical sensing platform for Cyst detection is proposed. Au NPs with plasmon resonance effect not only boost the light absorption but also facilitate the formation of Z-heterojunction HTNTs-Au-BOI through its own mediating effect. The Z-heterostructure with built-in electric field dramatically suppress the recombination of photogenerated electron-hole pairs and improve the sensitivity of the sensor. Meanwhile, the dual-specificity of Bi-S and Au-S bonds achieves a highly selective and sensitive detection of Cyst. The PEC sensor shows a wide linearity detection range of 80 nM-200 μM with a detection limit of 70 nM. The sensor also shows good results in the detection of serum samples, with a relative standard deviation (RSD) of 0.68–7.3 %.
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