A “turn-on” electrochemical aptasensor for ultrasensitive detection of Cd2+ using duplexed aptamer switch on electrochemically reduced graphene oxide electrode

2020 ◽  
Vol 159 ◽  
pp. 105372
Author(s):  
Chang-Seuk Lee ◽  
Su Hwan Yu ◽  
Tae Hyun Kim
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Ultrasensitive Detection ◽  
Electrochemical Aptasensor ◽  
Oxide Electrode ◽  
Turn On ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

A high-performance three-dimensional Ni–Fe layered double hydroxide/graphene electrode for water oxidation

2015 ◽  
Vol 3 (13) ◽  
pp. 6921-6928 ◽  
Author(s):  
Xiaowen Yu ◽  
Miao Zhang ◽  
Wenjing Yuan ◽  
Gaoquan Shi
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Layered Double Hydroxide ◽  
Water Oxidation ◽  
High Performance ◽  
Three Dimensional ◽  
Oxide Electrode ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide ◽  
Double Hydroxide

Ni–Fe layered double hydroxide nanoplates loaded on a three-dimensional electrochemically reduced graphene oxide electrode for efficient water oxidation, exhibiting higher activity, kinetics, and stability than those of the IrO2catalyst.

scholarly journals Electrochemical Detection of Ultratrace Lead Ion through Attaching and Detaching DNA Aptamer from Electrochemically Reduced Graphene Oxide Electrode

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 817 ◽  
Author(s):  
Su Hwan Yu ◽  
Chang-Seuk Lee ◽  
Tae Hyun Kim
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Dna Aptamer ◽  
Lead Ion ◽  
Oxide Electrode ◽  
Quadruplex Dna ◽  
Simple Strategy ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide ◽  
G Quadruplex

This paper describes a simple strategy for the ultratrace level detection of Pb2+ ion based on G-quadruplex DNA and an electrochemically reduced graphene oxide (ERGO) electrode. First, ERGO was formed on a glassy carbon electrode (GCE) by the reduction of graphene oxide (GO) using cyclic voltammetry. Subsequently, a methylene blue (MB)-tagged, guanine-rich DNA aptamer (Apt) was attached to the surface of ERGO via π-π interaction, leading to the Apt-modified ERGO electrode. The presence of Pb2+ could generate the folding of Apt to a G-quadruplex structure. The formation of G-quadruplex resulted in detaching the Apt from the ERGO/GCE, leading to a change in redox current of the MB tag. Electrochemical measurements showed the proposed sensor had an exceptional sensitivity for Pb2+ with a linear range from 10−15 to 10−9 M and a detection limit of 0.51 fM. The sensor also exhibited high selectivity for Pb2+, as well as many other advantages, such as stability, reproducibility, regeneration, as well as simple fabrication and operation processes.

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