College of Science & Health (CSH)
Electrochemical and electrical
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
