کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
180514 | 459382 | 2009 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Electrochemical impedance spectroscopy at single-walled carbon nanotube network ultramicroelectrodes Electrochemical impedance spectroscopy at single-walled carbon nanotube network ultramicroelectrodes](/preview/png/180514.png)
Electrochemical impedance spectroscopy (EIS), coupled with chemical vapour deposition (CVD) grown single-walled carbon nanotube (SWNT) network disk-shaped ultramicroelectrodes (UMEs), gives stable, very well-defined and highly reproducible EIS responses for electrolysis of a simple outer sphere redox couple (FcTMA+/2+). The resulting EIS data can be fitted accurately using a simple electrical circuit model, enabling information on double-layer capacitance, diffusion coefficient of the electroactive species and the rate constant of ET (k0) to be extracted in a single EIS experiment. These values are replicated for a range of mediator concentrations and UME sizes (in the range 25–100 μm diameter) demonstrating the robustness of the method. These initial studies bode well for impedance based electroanalysis using SWNT network UMEs.
Journal: Electrochemistry Communications - Volume 11, Issue 11, November 2009, Pages 2081–2084