Scanning electrochemical microscopy imaging of poly (3,4-ethylendioxythiophene)/thionine electrodes for lactate detection via NADH electrocatalysis
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Selective insulation with poly(tetrafluoroethylene) of substrate electrodes for electrochemical background reduction in scanning electrochemical microscopy.
We describe a wet process for the fabrication of poly(tetrafluoroethylene) (PTFE)-covered electrodes in which arrays of holes ( approximately 200 microm) are formed. The PTFE coating provides electrical insulation of most of the electrode surface with selected regions exposed for electrochemical experiments. The arrays of microholes can be controllably patterned and filled with precursor soluti...
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(11) Shahwan, 0. J.: Jezorek, J. R. J . Chromatogr. 1983, 256, 39-48. (12) Fulcher, C.; Crowell, M. A.; Bayllss, R.; Holland, K. B.; Jezorek, J. R. Anal. Chim. Acta 1981, 129, 29-47. (13) Jezorek, J. R.; Faltynski, K. H.; Blackburn, L. G.; Henderson, P. J.; Medlna, H. D. Talanta 1985, 32, 763-770. (14) Jezorek, J. R.; Faltynskl, K. H.: Finch, J. W. J. Chem. Educ. 1088, 63, 354-357. (15) Fabnskl...
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The electrochemical doping and undoping processes of poly-(3,3′′-didodecyl-2,2′:5′,2′′terthiophene) (poly(33′′DDTT)) were studied by scanning electrochemical microscopy (SECM) to characterize the electron transfer of the polymer with a redox mediator in solution when the polymer was at different oxidation levels. SECM showed that electron exchange processes of oxidized poly(33′′DDTT) were local...
متن کاملScanning electrochemical microscopy. 41. Theory and characterization of ring electrodes.
Ring ultramicroelectrodes, which are of particular interest as probes for scanning electrochemical microscopy (SECM), combined with near-field scanning optical microscopy, were investigated. Theoretical SECM tip current-distance (approach) curves for a ring electrode were calculated by numerical (finite element) analysis. The SECM curves obtained were a function of the geometry of the tips incl...
متن کاملScanning Electrochemical Microscopy. 15. Improvements in Imaging via Tip-Position Modulation and Lock-in Detection
The use of mai l amplitude tipposition modulation (TPM) in combination with lock-in detection of the modulated current signal greatly improves the sendtivity and image resolution of the scanning electrochemical microscope and provides a method of distinguishing between conductive and insulating areas on the substrate surface being examined. The experimental in-phase current versus distance beha...
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ژورنال
عنوان ژورنال: Biosensors and Bioelectronics
سال: 2019
ISSN: 0956-5663
DOI: 10.1016/j.bios.2019.04.042