Key Laboratory of Advanced Technologies of Materials (Ministry of Education of China), Superconductivity and New Energy R&D Centre, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China.
Anal Bioanal Chem. 2020 Jul;412(18):4403-4412. doi: 10.1007/s00216-020-02682-w. Epub 2020 May 12.
Considering the importance of hydrogen peroxide (HO) rapid detection, a SnS/MWCNTs composite was prepared by loading tin disulfide (SnS) nanoparticles on a three-dimensional conductive network composed of multi-walled carbon nanotubes (MWCNTs). The obtained SnS/MWCNTs composite was used as the modified material to prepare a chemically modified electrode (CME), which was used for the rapid detection of HO. The morphology and structure of the obtained samples were characterized and analyzed by scanning electron microscopy, X-ray diffraction, and energy-dispersive spectroscopy. The electrochemical performance of the modified electrode was researched by cyclic voltammetry, amperometric i-t curves, and AC impedance techniques. The results show that SnS nanoparticles with a size of about 33 nm are evenly dispersed on the surface of MWCNTs. The obtained SnS/MWCNTs-CME has a strong current response to HO: it has a good linear relationship during the range of 0.248 ~ 16.423 mmol L, and its linear regression equation is I (mA) = (-0.94 ± 0.05) × 10 + (- 0.43 ± 0.06) × 10c (mmol L) (R = 0.997) with a sensitivity of 87.84 μA mmol L cm. The corresponding detection limit is 1.04 μmol L (S/N = 3). At the same time, the SnS/MWCNTs-CME has good selectivity, reproducibility, and stability. Graphical abstract Uniformly distributed SnS/CNTs composite is used to prepare a chemically modified electrode for HO detection. The prepared electrode has a strong electrochemical response to HO due to the excellent conductivity and support of CNTs. And the SnS/CNTs electrode shows high sensitivity and selectivity for the electrochemical detection of HO.
鉴于过氧化氢（HO）快速检测的重要性，通过将二硫化锡（SnS）纳米颗粒负载在由多壁碳纳米管（MWCNTs）组成的三维导电网络上，制备了 SnS/MWCNTs 复合材料。将得到的 SnS/MWCNTs 复合材料用作修饰材料来制备化学修饰电极（CME），用于 HO 的快速检测。通过扫描电子显微镜、X 射线衍射和能量色散光谱对获得的样品的形貌和结构进行了表征和分析。通过循环伏安法、安培电流-时间曲线和交流阻抗技术研究了修饰电极的电化学性能。结果表明，尺寸约为 33nm 的 SnS 纳米颗粒均匀分散在 MWCNTs 的表面上。所得的 SnS/MWCNTs-CME 对 HO 具有很强的电流响应：在 0.248 ～ 16.423mmol·L 的范围内具有良好的线性关系，其线性回归方程为 I（mA）=（-0.94±0.05）×10+（-0.43±0.06）×10c（mmol·L）（R=0.997），灵敏度为 87.84μA·mmol·L·cm。相应的检测限为 1.04μmol·L（S/N=3）。同时，SnS/MWCNTs-CME 具有良好的选择性、重现性和稳定性。
