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Updated: Dec 31, 2025
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Published on: February 1, 2022
Functional Carbon Quantum Dots for Highly Sensitive Graphene Transistors for Cu2+ Ion Detection
Qin Fan1, Jinhua Li1, Yuhua Zhu1
1Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Key Laboratory for the Green Preparation and Application of Functional Materials, Ministry of Education, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering , Hubei University , Wuhan 430062 , China.
Highly sensitive copper ion (Cu2+) detection is achieved using functionalized graphene transistors. This novel sensor offers ultra-low detection limits and rapid response times for improved health monitoring.
Area of Science:
- Biomedical Engineering
- Materials Science
- Analytical Chemistry
Background:
- Copper ions (Cu2+) are vital in human biological processes.
- Accurate detection of Cu2+ is crucial for health diagnostics.
- Solution-gated graphene transistors (SGGTs) show potential for biosensing.
Purpose of the Study:
- To develop a highly sensitive and selective sensor for Cu2+ ion detection.
- To utilize functionalized carbon quantum dots (CQDs) on SGGTs for enhanced sensing capabilities.
- To explore the sensing mechanism based on CQD-ion interactions.
Main Methods:
- Construction of SGGTs with gate electrodes modified by functional carbon quantum dots (CQDs).
- Investigation of the coordination between CQDs and Cu2+ ions.
- Analysis of capacitance changes in the electrical double layer (EDL) and subsequent channel current variations.
Main Results:
- The CQD-modified SGGT sensor demonstrated ultrahigh selectivity for Cu2+ ions over other metal ions.
- Achieved a minimal detection concentration of 1 × 10-14 M for Cu2+, significantly lower than conventional methods.
- Exhibited a rapid response time within seconds.
Conclusions:
- The developed sensor provides a highly sensitive and selective method for Cu2+ detection.
- SGGTs modified with CQDs offer a promising platform for advanced biochemical sensing.
- The functionalized nature of CQDs enables potential multifunctional sensing applications.
