期刊
IEEE SENSORS JOURNAL
卷 23, 期 8, 页码 8146-8153出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2023.3257188
关键词
Copper detection; electrochemical sensor; flexible sensor; heavy metal; molybdenum disulfide (MoS2); screen printing
This study presents a flexible electrochemical sensor based on molybdenum disulfide (MoS2)-modified screen-printed carbon electrode (SPCE) for the detection of copper ions in water. The sensor shows excellent response with a limit of detection (LOD) of 5.43 μM for Cu ions in the range of 5 μM - 5 mM. Comparative studies with a conventional GCE demonstrate better linearity for the SPCE-based sensor.
Heavy metal ions (HMI), such as Cu2+, are harmful to the environment and our health. Such ions are typically measured using glassy carbon electrode (GCE)-based electrochemical sensors developed on rigid substrates. However, several emerging applications require such sensors on flexible, and even disposable, substrates. Herein, we present a molybdenum disulfide (MoS2)-modified screen-printed carbon electrode (SPCE)-based flexible electrochemical sensor for the detection of copper ions in the water. The sensor exhibits excellent response with a limit of detection (LOD) of 5.43 mu M for Cu ions in the range of 5 mu M - 5 mM. The developed sensor is compared with MoS2-modified conventional GCE using electrochemical impedance spectroscopy (EIS). The comparative studies show better linearity (R-2 value similar to 0.99) for SPCE-based sensor and underline how easily they can detect Cu ions. The interference study, i.e., detection of copper ions in the presence of other HMI-based analytes, also shows the excellent response of SPCE-based flexible electrochemical sensor-thus, demonstrating their practical application is the detection of Cu in water.
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