Scanning electrochemical microscopy | Wikipedia audio article
Channel: wikipedia tts
Date: 31/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Scanning_electrochemical_microscopy


00:01:36 1 History
00:03:14 2 Principles of operation
00:04:41 2.1 Feedback mode
00:05:55 2.2 Collection-generation modes
00:07:07 2.3 SECM imaging
00:08:00 3 Instrumentation
00:09:04 3.1 Preparation of electrodes
00:13:19 3.2 Potentiostat
00:14:00 3.3 Positioners and translators
00:14:54 4 Applications
00:15:48 4.1 Solid/Liquid Interface
00:15:57 4.1.1 Microstructuring
00:18:16 4.1.2 Ionic dissolution
00:20:07 4.1.3 Electrocatalysis investigation
00:21:55 4.1.4 Biological analysis
00:23:49 4.2 Liquid/liquid interface
00:23:59 4.2.1 Electrocatalysis
00:24:55 4.3 Liquid/gas interface



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SUMMARY
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Scanning electrochemical microscopy (SECM) is a technique within the broader class of scanning probe microscopy (SPM) that is used to measure the local electrochemical behavior of liquid/solid, liquid/gas and liquid/liquid interfaces. Initial characterization of the technique was credited to University of Texas electrochemist, Allen J. Bard, in 1989.
Since then, the theoretical underpinnings have matured to allow widespread use of the technique in chemistry, biology and materials science. Spatially resolved electrochemical signals can be acquired by measuring the current at an ultramicroelectrode (UME) tip as a function of precise tip position over a substrate region of interest. Interpretation of the SECM signal is based on the concept of diffusion-limited current. Two-dimensional raster scan information can be compiled to generate images of surface reactivity and chemical kinetics.
The technique is complementary to other surface characterization methods such as surface plasmon resonance (SPR),electrochemical scanning tunneling microscopy (ESTM), and atomic force microscopy (AFM)  in the interrogation of various interfacial phenomena. In addition to yielding topographic information, SECM is often used to probe the surface reactivity of solid-state materials, electrocatalyst materials, enzymes and other biophysical systems.
SECM and variations of the technique have also found use in microfabrication, surface patterning, and microstructuring.