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Electrochemical aptamer sensor for highly sensitive detection of mercury ion with Au/Pt@carbon nanofiber‐modified electrode
Author(s) -
Xie Hui,
Niu Yanyan,
Deng Ying,
Cheng Hui,
Ruan Chengxiang,
Li Guangjiu,
Sun Wei
Publication year - 2021
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.202000003
Subject(s) - aptamer , chemistry , detection limit , carbon nanofiber , electrochemistry , electrode , nanocomposite , electrochemical gas sensor , colloidal gold , carbonization , platinum , nanoparticle , platinum nanoparticles , mercury (programming language) , ionic liquid , chemical engineering , inorganic chemistry , nanotechnology , chromatography , organic chemistry , catalysis , materials science , adsorption , genetics , computer science , biology , programming language , engineering
In this paper, an electrochemical aptamer sensor was proposed for the highly sensitive detection of mercury ion (Hg 2+ ). Carbon nanofiber (CNF) was prepared by electrospinning and high‐temperature carbonization, which was used for the loading of platinum nanoparticles (PtNPs) by the hydrothermal method. The Pt@CNF nanocomposite was modified on the surface of carbon ionic liquid electrode (CILE) to obtain Pt@CNF/CILE, which was further decorated by gold nanoparticles (AuNPs) through electrodeposition to get Au/Pt@CNF/CILE. Self‐assembling of the thiol‐based aptamer was further realized by the formation of Au‐S bond to get an electrochemical aptamer sensor (Aptamer/Au/Pt@CNF/CILE). Due to the specific binding of aptamer probe to Hg 2+ with the formation of T‐Hg 2+ ‐T structure, a highly sensitive quantitative detection of Hg 2+ could be achieved by recording the changes of current signal after reacting with Hg 2+ within the concentration range from 1.0 × 10 −15 mol/L to 1.0 × 10 −6 mol/L and the detection limit of 3.33 × 10 −16 mol/L (3σ). Real water samples were successfully analyzed by this method.