A nonenzymatic L-cysteine sensor based on SnO2-MWCNTs nanocomposites

作者：Dong Yan; Zheng Jianbin^*

来源：Journal of Molecular Liquids, 2014, 196: 280-284.

DOI：10.1016/j.molliq.2014.03.046

• Nonenzymatic sensor
• L-cysteine
• SnO2
• Multiwall carbon nanotubes
• Chronoamperometry

In the present work, a SnO2-coated multiwall carbon nanotubes (MWCNTs) modified glassy carbon electrode (SnO2-MWCNTs/GCE) was fabricated and was used for amperotemetric detection of L-cysteine (CySH). The surface morphology and structure of the prepared nanocomposite modified electrode were investigated by transmission electron microscope (TEM), X-ray diffraction (XRD), and Raman spectroscopy. Electrochemical investigation indicated that the nanocomposites possess an excellent performance towards the electrocatalytic oxidation of CySH in phosphate buffer solution (pH 7.4). The current response of the SnO2-MWCNTs/GCE was linearly related to the CySH concentration in the range from 0.1 to 55.6 mu M and 55.6 to 554.5 mu M, respectively. The detection limit was 0.03 mu M at a signal-to-noise ratio of 3, and the response time was as short as 4 s. Additionally, the sensor exhibits long-term stability, good reproducibility and anti-interference.

• 出版日期2014-8
• 单位西北大学