College of Science & Health (CSH)
Electrochemical and electrical
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Electrochemical Analyzer
General use potentiostat capable of performing many common coulometric and voltametric measurements. These techniques include cyclic voltammetry, square wave voltammetry, and chronocoulometry.
CH Instruments 620B
- Variety of electrode and cells available
- Picoamp sensitivity
- Potential scan range of ±10 V
Contact: Aric Opdahl
Electrical Characterization
Jandel RM3000 Four-point Probe System
- Multi-height probe stand to accommodate samples up to 250 mm thick
- 100 um and 300 um tip diameter, linear array probe heads
- Measurement range of 1 mΩ/□ to 500 MΩ/□
- Current source range 10 nA to 99.99 mA
- Measured voltage range 0.01 mV to 1250 mV
Contact: Seth King
HP 4140b pA Meter/DC Voltage Source
- I-V and C-V measurements
- Computer controlled with LabView software
- Dark box and UV laser for photocarrier voltammetry
Contact: Seth King
Quartz Crystal Microbalance (QCM)
QCM is generally used to study adsorption behavior, including biomolecular interactions. The basis of the QCM is a piezoelectric quartz crystal sensor which oscillates at a resonance frequency in the MHz region. The exact frequency is determined by several factors, including the mass of the sensor. Increases in the mass of the sensor as a result of adsorption are observed as a reduction in the oscillation frequency.
Stanford Research QCM 100
- QCM crystals available with wide range of coatings
- Pico- to nanogram changes in mass detectable
- Can be used with CH instruments potentiosat to perform E-QCM measurements
Contact: Aric Opdahl
Scanning Tunneling Microscope (STM)
Similar to AFM, but relies on changes in current to look at the surface, rather than changes in force.
Agilent 4400
- Imaging in atmosphere, inert gas, or solution environments
- Atomic resolution
Contact: Seth King
