Graphene Device Fabrication and Characterization
Abstract
Graphene is a two-dimensional material consisting of a single layer of carbon atoms arranged in a hexagonal lattice. Graphene has some unique properties, as it is stronger than steel, it shows a high conductivity of heat and shows high carrier mobility(highest recorded mobility is 200,000 cm²/Vs), and it only absorbs 2% of light that passes through it. Single layer graphene was grown on copper in this research as it has been found to produce higher quality graphene than any other material tested. After the growth occurred, a wet-based transferring technique was used to transfer the graphene from the copper foil onto a SiO₂/Si substrate. The transferring technique included the use of Ammonium persulfate to etch away the copper and a PMMA(Polymethyl methacrylate) layer as the sacrificial film. Indium dots were pressed on four corners of graphene working as electrodes for graphene characterization by a Hall effect measurement system. We also observed the graphene’s sensing performance to NH₃ gas. The graphene’s changing properties were measured with the Hall effect measurement system and presented in the report.
Graphene Device Fabrication and Characterization
Founders Hall 108 A
Graphene is a two-dimensional material consisting of a single layer of carbon atoms arranged in a hexagonal lattice. Graphene has some unique properties, as it is stronger than steel, it shows a high conductivity of heat and shows high carrier mobility(highest recorded mobility is 200,000 cm²/Vs), and it only absorbs 2% of light that passes through it. Single layer graphene was grown on copper in this research as it has been found to produce higher quality graphene than any other material tested. After the growth occurred, a wet-based transferring technique was used to transfer the graphene from the copper foil onto a SiO₂/Si substrate. The transferring technique included the use of Ammonium persulfate to etch away the copper and a PMMA(Polymethyl methacrylate) layer as the sacrificial film. Indium dots were pressed on four corners of graphene working as electrodes for graphene characterization by a Hall effect measurement system. We also observed the graphene’s sensing performance to NH₃ gas. The graphene’s changing properties were measured with the Hall effect measurement system and presented in the report.
