Thin film sensor

Tuesday, 16 November, 2004 | Supplied by: ATA Scientific Pty Ltd

The quartz crystal microbalance with dissipation (QCM-D) sensor measures the mass of thin films and simultaneously provides information about their structure.

It enables real-time observations of molecular interactions with functionalised surfaces and biomaterials. Applications include proteins, lipids, polyelectrolytes, polymers and cells.

The sensor consists of a disc of crystalline quartz oscillating at a frequency depending on the mass of a bound thin film. When the oscillation is switched off it decays exponentially, enabling the resonance frequency and dissipation to be recorded.

The film mass can be calculated from the resonance frequency, and the dissipation rate gives information about film structure. Films that are viscous will dissipate energy and dampen the sensor oscillation much faster than rigid films.

By using multiple frequency and dissipation data, it is possible to calculate values of thickness, viscosity, elasticity, and density.

Phone: 02 9541 3500
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