Detection of intermediate during the electrochemical polymerization of azure B and growth of poly(azure B) film
- 化学化工－已发表论文 
The electrochemical polymerization of azure B has been studied using the rotating ring-disk electrode (RRDE) and the electrochemical quartz crystal microbalance (EQCM). The electrolytic solution consisted of 2.5 mmol dm(-3) azure B, 0.2 mol dm(-3) NaH2PO4 and 0.5 mol dm(-3) NaCl with various pH values. An intermediate was generated at the disk electrode and was collected. The collection efficiency increases with decreasing ring potential as well as increasing rotation rate. Thus, the intermediate carries a positive charge and is not too stable. Based on the determination of the frequency response of the EQCM, the polymerization rate of azure B increases slowly before the fifteenth cycle, and then increases quickly with increasing number of potential cycles. The EQCM is a very useful tool for determination of the starting polymerization potential of azure B, which is 0.60 V (vs. SCE) in this case. The maximum frequency difference during the oxidation and reduction processes of poly(azure B) film in the solution with pH 3.0 is 174.7 Hz, which corresponds to a mass change of 0.99 mug cm(-2).