What is the detection range from the surface?
The detection range varies from nanometers to micrometers, depending on the viscoelasticity of the applied film. In pure water it is approximately 250 nm. Applying a very rigid film such as a metal still gives the same detection range in water, which means that you do not affect the measurement principle while thin films have been coated on the surface prior to measurements. Compared to optical methods the detection range is a main benefit of QCM-D. Consider for example polyelectrolyte multilayers of several hundred nanometers. These are easily sensed by QCM-D.
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