Adlayer formation in low-pressure chemical vapor deposited graphene and its exploitation for creating PUF surfaces

Abstract

We investigate adlayer formation in low-pressure chemical vapor-deposited graphene and show that graphene can be grown to have adlayer morphologies that are useful for creating physical unclonable authentication tags with large encoding capacities. The number density and size of the adlayers significantly increase when graphene is grown on electrochemically reduced rough surfaces. They are widely varied by controlling the methane partial pressure, growth temperature, and surface oxidation states of the Cu foils. The uniformity and uniqueness of the optimally prepared 256-bit long authentication keys are extremely close to 0.5, affording an encoding capacity of 8.23 × 1062.