光电流
异质结
检出限
材料科学
适体
光电子学
电极
表面等离子共振
分析化学(期刊)
纳米技术
纳米颗粒
化学
色谱法
遗传学
生物
物理化学
作者
Lin Tang,Xilian Ouyang,Bo Peng,Guangming Zeng,Yuan Zhu,Jiangfang Yu,Chengyang Feng,Siyuan Fang,Xu Zhu,Jisui Tan
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2019-01-01
卷期号:11 (25): 12198-12209
被引量:56
摘要
Based on the unique photoelectrochemical properties of a CoO/Au/g-C3N4 Z-scheme heterojunction, a self-powered photoelectrochemical (PEC) aptasensor was constructed for the detection of microcystin-leucine arginine (MC-LR). Z-scheme heterojunctions can promote the separation of a photo-induced electron-hole pair, and the surface plasmonic resonance (SPR) of Au nanoparticles can significantly enhance the adsorption of visible light. Importantly, MC-LR molecules were captured by aptamers initially immobilized on the modified electrode due to their high affinity, and then oxidized by the photogenerated holes, which caused an amplified photocurrent signal, allowing the quantitative analysis of MC-LR by measuring the photocurrent intensity change. This PEC MC-LR aptasensor showed high sensitivity and selectivity within a wide linear response range from 0.1 pM to 10 nM and a detection limit of 0.01 pM. The application of this sensor in the analysis of lake water samples provided accurate results with a relative standard deviation (RSD) of 2.6%-4.2%.
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