What is it about?
We use the change in resonance frequency of a quartz crystal to determine the mass of a graphene layer, while it is being etched.
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Why is it important?
With this method we can determine the mass of graphene and also check if there is contamination on top, below or in-between the graphene layers. We can also use it to determine the etch rate of graphene and of the contamination.
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This page is a summary of: Mass measurement of graphene using quartz crystal microbalances, Applied Physics Letters, July 2019, American Institute of Physics,
DOI: 10.1063/1.5111086.
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