在 p H7.0的磷酸缓冲液中 ,用循环伏安法制备了聚甲苯胺蓝修饰碳纤维微柱电极 .自制的碳纤维微柱电极分别在 +2 .5 V恒电位极化 30 s,- 1.0 V恒电位极化 30 s后 ,电极活性得到明显改善 ,于 - 0 .8V～ +0 .8V的电位区间内循环扫描 ,即得到致密的聚甲苯胺蓝膜修饰碳纤维微柱电极 .研究了聚甲苯胺蓝膜修饰碳纤维微柱电极的电化学性质和电催化性能 ,该膜对神经递质多巴胺有良好催化作用 ,催化峰电流与多巴胺浓度在 3.0× 10 - 5 mol/ L～ 3.0× 10 - 4 mol/ L 内有线性关系 Poly (toluidine blue) modified carbon fiber microcolumn electrodes were prepared by cyclic voltammetry in p H7.0 phosphate buffer.The self-made carbon fiber microcolumn electrodes were polarized at +2.5 V potentials for 30 s, -1.0 After potentiostatic polarization of V for 30 s, the electrode activity was significantly improved, and the cycle was scanned in the potential range of -0.8V ~ +0.8V to obtain dense poly toluidine blue film modified carbon fiber micro-column electrode.We studied the effect of poly The electrochemical properties and electrocatalytic activity of toluidine blue film modified carbon fiber microcolumn electrode were investigated. The electrocatalytic activity of the membrane on the neurotransmitter dopamine was good. The catalytic peak current and dopamine concentration ranged from 3.0 × 10 -5 mol / L to 3.0 × 10 - 4 mol / L within a linear relationship