Observation of adsorbate coverage with electrogenerated chemiluminescence imaging

✍ Scribed by Royce C. Engstrom; Patty L. Nohr; Joseph E. Vitt

• Book ID: 103966998
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 572 KB
• Volume: 93
• Category: Article
• ISSN: 0927-7757
• DOI: 10.1016/0927-7757(94)02895-8

✦ Synopsis

The spatial distribution of poly(phenylene oxide) on platinum electrodes wns studied using the technique of electrogenerated chemiluminescence (ECL) imaging. The polymer was deposited on electrodes through the electrooxidation of phenol in aqueous solution. Electrochemical oxidation of phenol itself was effectively inhibited by the fihn, as was the electrogeneratcd chcmiluminesccn of luminol in alknlinc peroxide. Using n sensitive microscopic imaging system. light from the ECL reaction was collected and used to show where film coverage occurred on the surface. At partial coverages of poly(phenylenc oxide), some regions of the electrode were still nble to support electron transfer and thercforc the ECL images exhibited heterogcncity. Images showed that the nature nnd extent of coverage of poly(phcnylcnc oxide) on the surbcc was a factor of phenol oxidation potential. The potential dcpcndcncc of coverage was consistent with an isotherm that accounts for a high dcgrcc of attraction bctwccn udsorbcd moloculcs, so that coverap increased abruptly over ;L rclativcly small potcntiol rang,