摘要
通过层层自组装技术利用多壁碳纳米管（MWNTs）对玻碳电极进行厚度可控的表面修饰。在1．7V电压下，分散于水中的MWNTs在玻碳电极上电沉积2h后，分别在质量分数为1％的聚二烯丙基二甲基氯化铵溶液和1mtg／LMWNTs的四硼酸钠分散液（pH9．18）中交替浸泡15min，实现层层自组装修饰电极。当自组装层数为5时，得到的修饰电极对硫代胆碱（TCh）的循环伏安法检测结果与裸玻碳电极相比，氧化过电位由0．65V降低到0．35V，峰电流提高一倍左右，而且由于碳纳米管和双分子层结构的存在，使得电极抗产物污染能力加强，稳定性和重复性大幅度提升。该修饰电极对硫代胆碱的检测限在0．75μm以下，在1．50～75．00nm内呈现良好的线性关系（R=0．9998），在酶传感器的研制及农药残留的快速检测中有良好的应用前景。
The paper describes a controllable layer-by-layer self-assembly modification technique of multi-walled carbon nanotubes （MWNTs） towards glass carbon electrode （GCE）. The bilaycr membranes of PDDA and MWNTs, which are fabricated by alternate immersion of GCE in 1 wt% poly （diallyldimethylammonium chloride ） （PDDA） solution and 1 mg/L MWNTs dispersed in pH 9.18 borate buffer solution for 15 rain,are self-assembled to GCE after 2 hours＇ electro-deposition （ED） of MWNTs at the voltage of 1.7 V. The modified GCE with five self-assembled / PDDA/ MWNTst n bilayers shows good sensitivity, stability and high reproducibility towards the detection of TCh due to the presence of MWNTs bilayers, which reinforces the anti-fouling ability of the modified electrode. In comparison with bare GCE ,the oxidative over-potential obtained by modified GCE decreases from 0. 65 V to 0. 35 V, and the peak value increases by 100 percent. The modified GCE shows a low detection limit of less than 0. 75 μm, and an excellent linear range from 1.50 to 75.00 p.m. A good prospect of the modified electrode is described in fabrication of enzyme sensor and fast detection of pesticides.
出处
《现代化工》
CAS
CSCD
北大核心
2011年第1期88-92,共5页
Modern Chemical Industry
关键词
修饰电极
碳纳米管
电沉积
层层自组装
循环伏安法
硫代胆碱
modified electrode
carbon nanotube
electro-deposition
layer-by-layer self-assembly
cyclic vohammogram
thioeholine
