VersaSCAN Scanning Electrochemical Systems
8Pages

VersaSCAN™ Electrochemical Scanning System Scanning Electrochemical Microscopy (SECM) Scanning Vibrating Electrode Technique (SVET) Localized Electrochemical Impedance Spectroscopy (LEIS) Scanning Kelvin Probe (SKP) Scanning Droplet Cell (SDC) Non-Contact Optical Surface Profiling (OSP) VS Stylus - Constant Distance SECM

The VersaSCAN is a single platform capable of providing spatial resolution to both electrochemica and materials-based measurements. Traditional electrochemical experiment measure an average response over the entire electrode/electrolyte interface. Rarely is a sample homogenous. Samples often consist of local sites of passivate/active nature or sites of anodic/cathodic character. This need to investigate localized phenomenon led to the emergence of scanning probe electrochemistry. By making the measurement at a probe above the surface of the sample, the response is taken from a subset of the...

Constant Distance SECM In collaboration with LEPA-EPFL, we are pleased to offer the Soft Stylus Probe contact mode technique developed by Professor Hubert Girault and co-workers for constant distance SECM. The probe technology offers the following benefits: • Constant distance SECM: SECM imaging without major topographic artefacts. Ideal for tilted, corrugated and rough samples. • Soft contact with sample: with a contact force up to 1000 times less than hard probe technology, soft probes are ideal for studying biological samples in constant distance mode SECM. • Low cost: no need for...

Scanning Vibrating Electrode Technique Introduction The Scanning Vibrating Electrode Technique uses a single wire to measures potential field gradient drop in solution. This voltage drop is a result of local current at the surface of a sample. Measuring this gradient in solution images the current at the sample surface. Current can be naturally occurring from a corrosion or biological process, or the current can be externally controlled using a galvanostat. A piezo unit vibrates the probe in Z-direction (axis perpendicular to the sample). The amplitude of vibration may be only 10s of...

Localized Electrochemical Impedance Spectroscopy Introduction The VersaSTAT 3F applies an AC voltage to the sample emerged in electrolyte. This “global” voltage generates AC current to flow at the electrode / electrolyte interface. A dual-element probe is positioned in solution close to the surface of the sample. The electrometer measures a differential voltage measure between the two measurement elements as a measure of local voltage-drop in solution. This voltage-drop exists in solution because of current flow from local reactions at the sample, the resistance of the electrolyte and the...

Scanning Kelvin Probe Introduction The Kelvin Probe experiment uses a nondestructive method to determine the relative work function difference between the probe and the sample. Work function describes the energy required to liberate an electron from the surface of a conductor; electrochemists often interpret this as the energy difference from an electrode’s Fermi Level, average energy of electrons, and that of vacuum. A metal microprobe is positioned close to the surface of the sample (on the order of 100-microns). If the microprobe and sample are of different metals, there is an energy...

Scanning Droplet Cell Introduction Scanning Droplet System (SDC) uses a compact peristaltic pump to force electrolyte through a small diameter tube and into a specifically designed head. This PTFE-based SDC head is machined to allow electrolyte to flow past an installed Reference Electrode and then to a port at the base of the head. When the head is positioned sufficiently close to the sample a droplet forms between the head and sample. Tubing is also connected to an output port of the PTFE head. A second channel of the same peristaltic pump is then used to draw electrolyte past an...

VersaSCAN L-Cell ■ Screws into optical table of VersaSCAN ^ Approximately 1 Liter in volume Level adjustment mechanism Accepts large flat samples and 32mm ® diameter mounted samples Recommended for all techniques, ■ particularly LEIS, SVET, SKP, SDC, OSP VersaSCAN mL-Cell ■ Screws into optical table of VersaSCAN ■ Approximately 7 mL in volume ■ Level adjustment mechanism ■ Accepts a range of samples including 32mm diameter mounted samples and non-standard samples ■ Specifically engineered for low-volume SECM applications VersaCAM ■ Camera: Color Number of Pixels: 795 (H) x 596 (V) Minimum...