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2007
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In the Laboratory
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Electrochemical Quartz Crystal Microbalance Monitoring of the Cyclic Voltammetric Deposition of Polyaniline. A Laboratory Experiment for Undergraduates
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Qingji Xie, Zhili Li, Chunyan Deng, Meiling Liu, Youyu Zhang, Ming Ma, Shaoxi Xia, Xiaoming Xiao, Dulin Yin, and Shouzhuo Yao
College of Chemistry and Chemical Engineering, Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), Hunan Normal University, Changsha, Hunan 410081, China
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April 2007
Vol. 84 No. 4
p. 681
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| Abstract |
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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.
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| Supplement |
Student handout, instructor's notes, sample lab report sheet and questions are available.
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| More Information |
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Citation |
Xie, Qingji; Li, Zhili; Deng, Chunyan; Liu, Meiling; Zhang, Youyu; Ma, Ming; Xia, Shaoxi; Xiao, Xiaoming; Yin, Dulin; Yao, Shouzhuo. J. Chem. Educ. 2007, 84, 681.
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Keywords |
Analytical Chemistry; Aromatic Compounds; Electrochemistry; Graduate Education / Research; Hands-On Learning / Manipulatives; Inquiry-Based / Discovery Learning; Laboratory Instruction; Oxidation / Reduction; Physical Chemistry; Polymer Chemistry; Polymerization; Upper-Division Undergraduate
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History |
Created:
Last Updated: |
3/6/2007
3/8/2007
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 Caution! | | Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations. |
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