Electrochemical Quartz Crystal Microbalance Monitoring of the Cyclic Voltammetric Deposition of Polyaniline. A Laboratory Experiment for Undergraduates.
- Autores: Meiling Liu, Ming Ma, Qingji Xie, Zhili Li, Chunyan Deng, Youyu Zhang, Shaoxi Xia, Xiaoming Xiao, Dulin Yin, Shouzhuo Yao
- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 84, Nº 4, 2007, págs. 681-684
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
-
Resumen
The electrochemical quartz crystal microbalance (EQCM) has been well established as a powerful tool capable of monitoring in situ an electrode-mass change down to the nanogram or sub-monolayer level in an electrochemical process. In this work an EQCM experiment to monitor the cyclic voltammetric deposition of a conducting polyaniline (PANI) thin film on an Au electrode is designed as a research-like laboratory experiment for fourth-year undergraduates. The EQCM provides dynamic and quantitative information of both electrochemistry and PANI-film mass during the electropolymerization of aniline in aqueous HClO4, providing good understanding of the redox processes of PANI and allowing the current efficiency for PANI deposition and the largest dynamic anion-doping ratio of the leucoemeraldine�emeraldine transition for the prepared PANI to be determined by one single cyclic voltammetric measurement. This experiment is a month-long upper-level project with three-hour laboratory time designed for fourth-year students to learn the EQCM methodology and the chemistry knowledge involved, as well as to improve their literature skill, independent study ability, and scientific research potential.
