Visible-light-driven photoelectrochemical aptasensor based on reduced graphene oxide/Ti-Fe-O nanotube arrays for highly sensitive and selective determination of microcystin-LR

被引：26
作者：
Lu, Hanxing [1 ]
Wang, Guoqiang [1 ]
Dai, Ruihua [2 ]
Ding, Xue [1 ,3 ]
Liu, Meichuan [1 ]
Sun, Huanhuan [1 ]
Sun, Caiqin [1 ]
Zhao, Guohua [1 ]
机构：
[1] Tongji Univ, Sch Chem Sci & Engn, Shanghai Key Lab Chem Assessment & Sustainabil, 1239 Siping Rd, Shanghai 200092, Peoples R China
[2] China Fudan Univ, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China
[3] Shanghai Jiao Tong Univ, Instrumental Anal Ctr, Shanghai 200240, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2019年 / 324卷
基金：
中国国家自然科学基金;
关键词：
Microcystin-LR; Ti-Fe-O nanotube; Reduced graphene oxide; Visible-light-driven photoelectrochemcial (PEC) aptasensor; SIGNAL-AMPLIFICATION; ELECTROCHEMICAL APTASENSOR; CYANOBACTERIAL TOXINS; WATER; SENSOR; FABRICATION; NANOCOMPOSITES; BIOSENSOR; FILMS;
D O I：
10.1016/j.electacta.2019.134820
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Microcystin-LR (MC-LR) is one of the highly concerned microcystins with strong hepatotoxicity. In this work, a visible-light-driven photoelectrochemical (PEC) aptasensor has been successfully developed for MC-LR based on reduced graphene oxide (rGO)/Ti-Fe-O nanotubes (NTs). Vertically-aligned Ti-Fe-O NTs are in situ prepared on Ti-Fe alloy by electrochemical anodic oxidation to provide an outstanding photoanode substrate with good visible light response ability. RGO is further electrochemically deposited onto Ti-Fe-O NTs, acting not only as the molecular bridge for immobilization of MC-LR aptamers (Apt), but also as the PEC signal amplification element. Attributed to the large pi-conjugated structure of rGO which can effectively promote photo-generated electron-hole separation, as well as the good visiblelight activities of Ti-Fe-O NTs, the constructed Apt/rGO/Ti-Fe-O NTs sensor exhibits prominent determination performance for MC-LR with a detection limitation of 5 fM. High selectivity and stability towards MC-LR is further proven to the aptasensor by performing the co-existing experiments and long-termed replicates. Meanwhile, satisfactory results are obtained when applying in real water sample investigation. A promising visible-light-driven PEC platform for highly sensitive and selective detection of MC-LR has thus been provided. (C) 2019 Elsevier Ltd. All rights reserved.
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页数：10
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