• 文献标题:   Visible-light-driven photoelectrochemical aptasensor based on reduced graphene oxide/Ti-Fe-O nanotube arrays for highly sensitive and selective determination of microcystin-LR
  • 文献类型:   Article
  • 作  者:   LU HX, WANG GQ, DAI RH, DING X, LIU MC, SUN HH, SUN CQ, ZHAO GH
  • 作者关键词:   microcystinlr, tifeo nanotube, reduced graphene oxide, visiblelightdriven photoelectrochemcial pec aptasensor
  • 出版物名称:   ELECTROCHIMICA ACTA
  • ISSN:   0013-4686 EI 1873-3859
  • 通讯作者地址:   Tongji Univ
  • 被引频次:   7
  • DOI:   10.1016/j.electacta.2019.134820
  • 出版年:   2019

▎ 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.