b b 10 pts How does a OCM quartz crystal microbalance measur

b. b. (10 pts) How does a OCM (quartz crystal microbalance) measure film thickness? Explain (10 pts) How does a QCM (quartz crystal microbalance) measure film thickness? Explain in less than 5 lines.

Solution

QCM measures a mass variation per unit area by measuring change in the frequency of quartz crystal resonator.The resonance is disturbed by the film deposition at the surface of acoustic resonator.For thin films the resonance frequency is inversely proportional to total thickness of the plate.When film thickness increases viscoelastic effects come into play.