基于层层自组装技术制备石墨烯/多壁碳纳米管共修饰的过氧化氢传感器的研究

Hydrogen Peroxide Sensor Based on Grapheme/Multi-walled Carbon Nanotubes via Layer-by-Layer Assembly Technique

利用阳离子型聚合物聚二烯丙基二甲基氯化铵（PDDA）和功能化的带负电荷的多壁碳纳米管（MWNTs）及石墨烯（GR）之间的静电吸附，通过层层自组装的方法在玻碳电极的表面制备了均一、稳定的（PDDA／GR／PDDA／MWNTs），多层膜。以交流阻抗及循环伏安等方法对修饰电极的性质进行了表征。结果表明，该电极对过氧化氢（H2O2）的氧化显示出较好的电催化活性，在工作电位为1．0V，0．067mol／L磷酸盐缓冲溶液（PBS）中对H2O2响应灵敏度高，检测范围宽，测定H2O2的线性范围为6×10^-6～lA×10^-2mol／L（相关系数为0．997）。检出限为1．2×10^-7mol／L（S／N-3）。并且表现出良好的稳定性和高选择性。该电极用于实际样品中H2O2的测帘,结果今人满煮．

An uniform stable poly（diallyldimethyl-ammonium chloride/graphene（PDDA/GR）/PDDA/ MWNTs composite membrane on the glassy carbon electrode were prepared by using layer-by-layer self assembly method based on the electrostatic adhesion among the cationic polymer PDDA and the functional negatively charged MWNTs and GR. The properties of the modified electrode have been studied by EIS and CV. The results indicate that this electrode shows better electrocatalytic activity in oxidation of H2O2. When working potential is set at 1.0 V, the electrode shows high sensitivity and wide detection range for detection of H202 in 0. 067 mol/L phosphate buffer solution. The range of linearityis 6×10^6-1.4×10^-1 mol/L, the detection limit is 1.2×10^-7 mol/L （S/N=3） and the linear correlation coefficient R=0. 997. This electrode is of good stability and high selectivity.