期刊
ANALYTICAL METHODS
卷 11, 期 30, 页码 3851-3856出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ay00912d
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资金
- Qatar National Research Fund (A member of Qatar Foundation) through the NPRP grants [NPRP8-286-2-118, NPRP9-254-2120]
Rapid and real-time detection of l-cysteine (l-Cys) is important for early diagnostics of several diseases and biological disorders. We report here a stable and highly sensitive electrochemical sensor for the detection of l-Cys based on a Pd@Ti3C2Tx (MXene)-modified glassy carbon electrode (GCE). The Pd@Ti3C2Tx nanocomposite was prepared by in situ reduction of Pd(ii) salt on the surface of delaminated (DL) Ti3C2Tx nanosheets to form pseudo-spherical palladium nanoparticles (PdNPs) with 2-6 nm size distributions. The MXene acts as the conductive matrix and a reducing agent at the electrode surface, while PdNPs are there to improve the stability of Ti3C2Tx and to enhance the electrocatalytic activity towards l-Cys detection. The Pd@Ti3C2Tx/GCE sensor exhibited a detection limit of 0.14 mu M and a linear electro-oxidative response to l-Cys within the concentration range from 0.5 to 10 mu M. The sensor also demonstrated excellent selectivity over common interfering ions such as ascorbic acid, uric acid, dopamine and glucose.
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