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Ti3C2Tx MXene sensor for rapid Hg2+ analysis in high salinity environment
Sibei Hao1, Chengbin Liu1, Xiaoyan Chen1
1College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
A new field-effect transistor (FET) sensor using Ti3C2Tx MXene efficiently detects mercury ions (Hg2+) in water. This advanced sensor works even in high salinity, offering potential for real-world environmental monitoring.
Area of Science:
- Environmental Science
- Materials Science
- Analytical Chemistry
Background:
- Mercury (Hg2+) is a significant environmental pollutant requiring advanced detection methods.
- Field-effect transistor (FET) sensors offer rapid chemical analysis capabilities.
- Developing sensitive and selective Hg2+ sensors for diverse water conditions is crucial.
Purpose of the Study:
- To construct and evaluate a Ti3C2Tx MXene-based FET sensor for Hg2+ detection.
- To assess the sensor's performance in high salinity environments.
- To elucidate the sensing mechanism of Hg2+ detection by the Ti3C2Tx MXene FET.
Main Methods:
- Fabrication of a Ti3C2Tx MXene channel FET sensor.
- Testing the sensor's response to Hg2+ in aqueous solutions.
- Evaluating sensor performance in 1 M NaCl solution to simulate high salinity.
- Investigating the sensing mechanism through surface adsorption and reduction analysis.
Main Results:
- The Ti3C2Tx MXene FET sensor demonstrated rapid and selective detection of Hg2+.
- The sensor maintained satisfactory performance in a high salinity environment (1 M NaCl).
- The sensing mechanism involves Hg2+ adsorption and reduction to Hg+ on the Ti3C2Tx surface.
Conclusions:
- The developed Ti3C2Tx MXene FET sensor is a promising platform for label-free Hg2+ detection.
- Its ability to function in high salinity makes it suitable for real-world water analysis.
- The sensor has significant potential for on-site monitoring and risk assessment of mercury in aquatic systems.
