Abstract
This work describes a method for electrostatic deposition of graphene over a large area using controlled electrostatic exfoliation from a Highly Ordered Pyrolytic Graphite (HOPG) block. Deposition over 130 × 130 µm2 with 96% coverage is achieved, which contrasts with sporadic micro-scale depositions of graphene with little control from previous works on electrostatic deposition. The deposition results are studied by Raman micro-spectroscopy and hyperspectral analysis using large fields of view to allow for the characterization of the whole deposition area. Results confirm that laser pre-patterning of the HOPG block prior to cleaving generates anchor points favoring a more homogeneous and defect-free HOPG surface, yielding larger and more uniform graphene depositions. We also demonstrate that a second patterning of the HOPG block just before exfoliation can yield features with precisely controlled geometries.
Highlights
A decade ago, graphene exfoliation from bulk graphite by repeated surface cleaving using household Scotch tape was changing the world we live-in [1,2,3,4]
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Prior to electrostatic we can observed reasonably speculate that this success is the result of reasonably speculate that thisislands success the result of an anchoring effect of deposition, the patterned island on of the etched graphene via is scotch tape cleaving prior to electrostatic we can an anchoring effect of the patterned island on the bulk Highly Ordered Pyrolytic Graphite (HOPG) when they are removed
Summary
A decade ago, graphene exfoliation from bulk graphite by repeated surface cleaving using household Scotch tape was changing the world we live-in [1,2,3,4]. Novel deposition methods have generated significant interest due to growing demands for large-scale device integration. Chemical vapor deposition (CVD) is currently the leading approach to produce large-scale graphene. This method exploits the chemical reaction between methane and hydrogen gases with a metallic surface to grow graphene directly on the surface [30,31,32,33,34]. CVD is the preferred graphene deposition method since it produces the best quality graphene and allows for precise control over the size and shape of the deposition [30,31,32,33,34]
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