摘要
制成了碳纳米管(CNT)和碳纳米管复合β-环糊精(β-CD)修饰电极,用循环伏安(CV)和差分脉冲伏安法(DPV)对核黄素(RF)的电化学行为进行了研究。实现了核黄素在不同pH的溶液中的氧化还原机理的探讨及其定量测定,线性范围5.0×10-7～2.5×10-6mol/L,相关系数r=0.9985,检测限为3.0×10-7mol/L。实验表明碳纳米管对核黄素的氧化还原有电催化作用,主要是由于碳纳米管的一维管状结构及独特的电子特性促进了电子的传递。β-CD的加入对RF电位没有影响,但增大了峰电流,可能是因为环糊精复合碳纳米管修饰电极的界面体现了新颖的建筑层-碳纳米管集合体大的孔隙充填小孔的环糊精,发挥了碳纳米管和环糊精的双重功能。
The eleetrocatalytic behavior of Riboflavin （RF） on CNT and CNT/β- CD modified electrodes has been investigated by using cyclic vohammetry （CV） and differential pulse vohammetry （DPV） . A different pulse voham- metric technique for measurement of Riboflavin over the range of 5. 0 x 10^-7 to 2.5 x 10^-6 mol/L has been developed. The detection limit was 3.0 x 10^-7 mol/L and correlative coefficient was 0. 998 5. It is found that CNT modified elec- trode shows enhanced sensitivity to RF, because the tube structure and unique electric characteristic accelerate the transfer of electrons, Additions of β- CD to modified electrodes increase the peak current but don＇ t change the potential of RF. The CNT/β- CD modified electrode has a novel interfacial architecture that fills small aperture β- CD in holes of CNT, which combines the function of CNT and β- CD.
出处
《化学传感器》
CAS
2006年第1期41-43,共3页
Chemical Sensors
关键词
碳纳米管
Β-环糊精
修饰电极
核黄素
电化学行为
carbon nanotube
β-cyclodextrin（CD）
modified electrode
riboflavin（RF）
electrocatalytic behavior
