高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (4): 20230521.doi: 10.7503/cjcu20230521

• 分析化学 • 上一篇    下一篇

石墨烯-金纳米材料修饰电极用于L-酪氨酸的检测

马勤政1,2, 王伟1,2(), 梁旭婷1,2   

  1. 1.河北工业大学电子信息工程学院, 天津 300401
    2.天津市电子材料与器件重点实验室, 天津 300401
  • 收稿日期:2023-12-25 出版日期:2024-04-10 发布日期:2024-01-31
  • 通讯作者: 王伟 E-mail:wangwei@hebut.edu.cn
  • 基金资助:
    河北省自然科学基金(F2019202377)

Graphene⁃gold Nanomaterial Modified Electrode for the Detection of L-Tyrosine

MA Qinzheng1,2, WANG Wei1,2(), LIANG Xuting1,2   

  1. 1.Hebei University of Technology,School of Electronics and Information Engineering,Tianjin 300401,China
    2.Tianjin Key Laboratory of Electronic Materials and Device,Tianjin 300401,China
  • Received:2023-12-25 Online:2024-04-10 Published:2024-01-31
  • Contact: WANG Wei E-mail:wangwei@hebut.edu.cn
  • Supported by:
    the Natural Science Foundation of Hebei Province, China(F2019202377)

摘要:

采用一种绿色简单的电化学方法将还原氧化石墨烯-金纳米复合薄膜共沉积到玻碳电极(GCE)上, 作为传感器用于L-酪氨酸(L-Tyr)的检测. 采用扫描电子显微镜(SEM)、 循环伏安法(CV)和电化学阻抗谱(EIS)对修饰电极进行了表征. 采用差分脉冲伏安法(DPV)研究了0.1 mol/L磷酸盐缓冲溶液中L-Tyr在修饰电极上的电化学行为, 发现L-Tyr在修饰电极上的伏安响应比裸GCE明显提高. 对复合薄膜的厚度、 支撑电解质的pH值、 沉积电位和积累时间进行了优化; 在最佳实验条件下, L-Tyr的氧化峰电流在0.1~50 μmol/L及50~1000 μmol/L浓度范围内呈现良好的线性关系. 该传感器的检出限为50 nmol/L, 灵敏度为0.553 μA·μmol·L‒1, 具有良好的重复性、 稳定性和抗干扰性.

关键词: 电化学, 还原氧化石墨烯, 金纳米粒子, 共沉积, L-Tyr传感器

Abstract:

Using a green and simple electrochemical method, a reduced graphene oxide-gold nanocomposite thin film was prepared for the detection of L-tyrosine(L-Tyr). The modified electrode was characterized via scanning electron microscopy(SEM), cyclic voltammetry(CV), and electrochemical impedance spectroscopy(EIS). The electrochemical behavior of L-Tyr on the modified electrode in 0.1 mol/L phosphate buffer solution was investigated using differential pulse voltammetry(DPV). The results demonstrated a significantly enhanced voltammetric response of L-Tyr on the modified electrode compared to a bare glassy carbon electrode(GCE). Optimization of the composite film’s thickness, pH of the supporting electrolyte, deposition potential, and accumulation time were carried out. Under the optimal experimental conditions, the oxidation peak current of L-Tyr exhibited a good linear relationship within the concentration ranges of 0.1—50 μmol/L and 50—1000 μmol/L using DPV. Moreover, the sensor demonstrated a detection limit of 50 nmol/L, a sensitivity of 0.553 μA·μmol·L‒1, and displayed excellent repeatability, stability, and anti-interference properties.

Key words: Electrochemistry, Reduced graphene oxide, Gold nanoparticle, Co-deposition, L-Tyr sensor

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