Electrostatic Deposition of Large-Surface Graphene

• Main Authors: Charles Trudeau, Laura-Isabelle Dion-Bertrand, Sankha Mukherjee, Richard Martel, Sylvain G. Cloutier
• Format: Article
• Language: English
• Published: MDPI AG 2018-01-01
• Series: Materials
• Subjects: graphene; electrostatic deposition; Raman spectroscopy
• Online Access: http://www.mdpi.com/1996-1944/11/1/116

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.