碳纤维纳米圆盘电极和金超微电极的制备

Fabrication of nanometer-sized carbon fiber disk electrode and gold ultramicroelectrode

提出了一种简单制备碳纤维纳米圆盘电极的新方法.将微米级碳纤维经化学刻蚀后,通过多次电化学沉积电泳漆,加热烘烤;然后将完全绝缘的碳纤维电极塑封在聚丙烯膜中,打磨抛光后露出电极表面,制得碳纤维纳米圆盘电极.电化学实验表明电极的有效半径为几十到几百纳米.以制得的碳纤维纳米圆盘电极为基体,通过还原沉积金制备了纳米级超微金电极.

A new and simple method for preparing nanometer-sized carbon fiber disk electrode and gold ultramicroelectrode is presented. It involves two steps. Firstly, the carbon fiber is etched in NaOH solution of 0.01 mol· L^-1 to form a cone-shaped tip with the end of nanometer dimensions. Then the etched carbon fiber is totally insulated by electrodeposition of electrophoretic paint. The carbon fiber is sealed with the film of polypropylene and polished with alumina water slurry on the silk till the well-defined sigmoidal feature of steady-state voltammetry was obtained in the solution of 0.01 mol· L^-1 K3Fe（CN）6 and 0. 5 mol·L^-1 KCl. The electrodes show ideal steady-state vohammetric behaviors from which the effective areas of nanoelectrodes are measured. The effective radius of the nanoelectrodes prepared ranges from tens of nanometer to hundreds of nanometer. The gold ultramicroelectrodes have been prepared with electrodeposition of Au in HAuCl4 solution at the nanometer-sized carbon fiber electrodes.