Graphene nanowalls grown on copper mesh

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Graphene nanowalls (GNW_s) are graphitic carbon nanosheets grown vertically on substrates.
• Conventional GNW_s film fabrication often requires costly cleanroom procedures for patterned substrates.
• Plasma-enhanced chemical vapor deposition (PECVD) is a common technique for GNW_s growth.

Purpose of the Study:

• To develop wafer-scale patterned GNW_s films using a cost-effective method.
• To characterize the structure, transfer, and properties of these patterned GNW_s films.
• To explore the application of patterned GNW_s films in surface modification and energy storage.

Main Methods:

• Low-power direct-current PECVD was employed to grow GNW_s on copper meshes.
• Wafer-scale patterning was achieved by utilizing the mesh structure as a template.
• Characterization involved analysis of film morphology, microstructure, and wetting properties. Application testing included Li-ion battery anode performance.

Main Results:

• Vertically-aligned GNW_s mats (∼300 nm height) were successfully grown, replicating the copper mesh dimensions.
• Growth on copper foils under identical conditions resulted in limited deposition.
• The transferred GNW_s films exhibited hydrophobicity and altered the wetting behavior of SiO₂ surfaces.
• GNW_s films demonstrated utility as active materials for C-on-Cu anodes in Li-ion batteries.

Conclusions:

• Low-power PECVD on copper meshes offers a scalable and cost-effective route to patterned GNW_s films.
• The resulting GNW_s films possess unique hydrophobic properties suitable for surface engineering.
• Patterned GNW_s films are promising for advanced applications, including Li-ion battery anodes.