Electrochemistry - VersaScan Scanning Electrochemical Microscope Webinar (SECM)

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VersaSCAN Electrochemical Scanning System Webinar

Table of Contents
Introduction of VersaSCAN System 0:00
The advantage of localized vs bulk measurements 3:53
Components of a SECM System 14:22
The tips/probes 18:40
Scanning vs stationary experiments 20:22
Sweep Mode or Step Mode? 22:48
Constant Height vs Constant Distance Mode 26:21
Experimental results 28:30
Feedback vs Generator-Collector Mode 33:30
The approach curve Experiment 36:20
Substrate-Generation Tip-Collection (SG-TC) 55:43
Tip-Generation Substrate-Collection (TG-SC) 1:01:52
Topographic effects and their complications 1:05:34
Limitations to resolution 1:06:06
Applications 1:11:30

The VersaSCAN is a single platform capable of providing spatial resolution to both electrochemical and materials-based measurements. Each VersaSCAN is based on a common high-resolution, long-travel, closed-loop positioning system mounted to a vibration-resistant optical base. Different auxiliary pieces are mounted to the positioning system. These ancillary pieces provide functionality to the positioning system for different scanning probe experiments. VersaSTAT potentiostats and Signal Recovery Lock-in Amplifiers are integrated via ethernet control to make accurate measurements of these small signals.

SECM
•Scanning Electrochemical Microscopy, SECM
•Scanning Vibrating Electrode Technique, SVET
•Scanning Kelvin Probe, SKP
•Localized Electrochemical Impedance Spectroscopy, LEIS
•Scanning Droplet System, SDS
•Non-Contact Surface Profiling, OSP

Each technique uses a different measurement probe that is positioned close, but not in conact to the sample. After a measurement is made at the probe, its position is incremented. Plotting recorded parameter versus probe position creates a data map. Depending on the technique, this map could represent local electrochemical current, impedance, relative work function, or topography.

The VersaSCAN SECM integrates the Base with two VersaSTAT Potentiostats and an ultramicroelectrode probe with a specific tapered polish. SECM is a versatile technique adding spatial resolution to applications such as kinetics, biological sensors, catalyst, and corrosion mechanisms.
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•Compatible Potentiostats: VersaSTAT 3F and either a VersaSTAT 3 / 3F /4


•Capable of Approach Curves experiments and both Feedback Mode and Generator-Collector Mode imaging modes


•Can perform Constant-Distance operation in conjunction with a topographic measurement technique, typically OSP


•VersaSTATs are additionally capable of a vast suite of standard non-scanning electrochemical tests depending on their specific software model