Chitosan/graphene oxide/MoS2/AuNPs modified electrochemical sensor for trace mercury detection
- Resource Type
- Conference
- Authors
- Wang, Ri; Xiong, Chenyu; Xie, Yong; Han, Mingjie; Xu, Yuhao; Bian, Chao; Xia, Shanhong
- Source
- 2021 IEEE 16th International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) Nano/Micro Engineered and Molecular Systems (NEMS), 2021 IEEE 16th International Conference on. :1303-1307 Apr, 2021
- Subject
- Bioengineering
Components, Circuits, Devices and Systems
Computing and Processing
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
Photonics and Electrooptics
Power, Energy and Industry Applications
Robotics and Control Systems
Electrodes
Correlation coefficient
Electric potential
Sensitivity
DNA
Linearity
Ions
molybdenum disulfide
thymine-Hg2+-thymine
electrochemical sensor
trace mercury detection
- Language
- ISSN
- 2474-3755
This study reports a novel electrochemical sensor to detect trace mercury based on an electrode coated by chitosan/graphene oxide/MoS 2 /AuNPs and thymine-Hg 2+ -thymine base pair. This method effectively utilizes the biocompatibility of molybdenum disulfide to DNA and constructs a detection platform for mercury ions. The electrocatalytic activity of MoS 2 and the specific binding of thymine-Hg 2+ -thymine base pair significantly reduce the detection limit of mercury and improve the sensitivity of the electrode. When there exists Hg 2+ , the voltammetric current signal of redox peak decreases after the interaction between mercury and DNA. The sensor showed good linearity from $0.01\mu\mathrm{g}/\mathrm{L}$ to $4\mu\mathrm{g}/\mathrm{L}$ with a correlation coefficient of 0.991 and the limit of detection was found to be 5.8ng/L. This simple, sensitive, low cost and easy preparation electrochemical sensor has the potential application in trace mercury detection.