新型聚N,N-二甲基苯胺/多壁碳纳米管修饰电极的制备、表征与应用  

Preparation,Characterization and Application of Novel Poly N,N-Dimethylaniline/Multiwalled Carbon Nanotube Modified Electrode

作　　者：李娟娟[1] 李将渊[1] 年作权[1] 

机构地区：[1]化学合成与污染控制四川省重点实验室,西华师范大学化学化工学院,南充637009

出　　处：《应用化学》2013年第3期360-366,共7页Chinese Journal of Applied Chemistry

基　　金：四川省南充市科学技术局重点科研项目(N2008-SF003)

摘　　要：采用多壁碳纳米管(MWNT)改性聚N,N-二甲基苯胺(PDMA)膜,制备了新型复合膜修饰玻碳电极,并用SEM、电化学方法对修饰电极进行表征。结果表明,无论MWNT是以掺杂还是先滴涂MWNT再聚合DMA多层修饰方式,均会改变PDMA膜的形貌和电化学性能。复合膜修饰电极比单一PDMA膜修饰电极大幅度提高了比表面积和电活化面积,同时使PDMA和MWNT更好地协同发挥其优良的电化学特性。实验结果表明,层层修饰制备的聚N,N-二甲基苯胺/多壁碳纳米管复合膜修饰电极对香草醛的电化学响应远大于基体电极和其它方法制备的修饰电极,电催化作用显著提高,其过电位降低了148 mV,氧化峰电流约增加了6倍;其电极反应是吸附控制的不可逆氧化过程,转移电子数n为2,质子数m为1,传递系数α为0.4062,吸附量为Γ=3.527×10-9mol/cm2;检出下限为8.0×10-7mol/L,样品平均回收率为99.87%。The method of preparing novel poly N,N-dimethyl aniline （PDMA）/multi-walled carbon nanotubes （MWNT） composite film modified glassy carbon（ GC ） electrode was investigated. SEM and electrochemical characterizations indicated that the morphology and electrochemical performance of the PDMA film were changed no matter the MWNT was doped or drop coated to DMA. The composite film modified electrode greatly increased the specific surface area and the electrical activation area compared with a single PDMA film modified electrode, indicating that the PDMA and MWNT play important roles in improving the electrochemical properties. The results showed that the electrochemical response of vanillin is much greater on the PDMA/ MWNT/GC layers than on the bare GC electrode and other modified electrodes. The over potential was reduced by 148 mV, and the oxidation peak current was increased by about six times. The electrode reaction was an irreversible redox process and was likely an adsorptive process. The numbers of the electron and proton transferred in the electrode reaction were 2 and 1, respectively, the transfer coefficient was calculated to be 0. 4062, and the amount of adsorption was 3.527 × 10 -9 mol/cm2. The detection limit was 8.0 × 10 -7 mol/L, and the average recovery was 99.87%.

关 键 词：N N-二甲基苯胺 多壁碳纳米管 修饰电极 表征 应用 

分 类 号：O657.1[理学—分析化学]