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Transport mechanisms in a puckered graphene-on-lattice
1Key Laboratory of Advanced Display and System Application, Shanghai University, 149 Yanchang Road, Shanghai 200072, People's Republic of China.
Nanoscale
|April 12, 2018
Summary
Patterning graphene topography on compliant substrates is key for better graphene sensors. This study shows that puckered graphene-on-lattice resistivity is governed by thermal activation, not strain, offering potential for enhanced sensor performance.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene's unique electronic properties make it promising for advanced sensors.
- Controlling graphene's topography is crucial for optimizing sensor performance.
- Compliant substrates offer a method for patterning graphene structures.
Purpose of the Study:
- To investigate the effects of topography patterning on graphene's electrical transport properties.
- To understand the relationship between strain and resistivity in puckered graphene-on-lattice structures.
- To explore the potential of graphene-on-lattice for enhanced graphene sensor applications.
Main Methods:
- Suspension of a graphene monolayer on silicon dioxide (SiO2) nanopillar arrays.
- Nanoscale investigation of strain distribution within the graphene.
- Analysis of electrical transport properties, focusing on resistivity and charge carrier behavior.
Main Results:
- Nonuniform strain distribution was observed in the patterned graphene.
- Resistivity was primarily governed by thermally activated transport, not strain.
- High thermal activation energy was attributed to low charge carrier density and periodic chemical potential changes.
Conclusions:
- The interaction between graphene and nanopillars significantly influences its electronic properties.
- Thermally activated transport, rather than strain, dictates resistivity in this configuration.
- Graphene-on-lattice structures present a promising avenue for improving the electrical response of graphene sensors.
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