Significant Enhanced Mechanical Properties of Suspended Graphene Film by Stacking Multilayer CVD Graphene Films

Suspended graphene film is of great significance for building high-performance electrical devices. However, fabricating large-area suspended graphene film with good mechanical properties is still a challenge, especially for the chemical vapor deposition (CVD)-grown graphene films. In this work, the mechanical properties of suspended CVD-grown graphene film are investigated systematically for the first time. It is found that monolayer graphene film is hard to maintain on circular holes with a diameter of tens of micrometers, which can be improved greatly by increasing the layer of graphene films. The mechanical properties of CVD-grown multilayer graphene films suspended on a circular hole with a diameter of 70 mu m can be increased by 20%, and multilayer graphene films prepared by layer-layer stacking process can be increased by up to 400% for the same size. The corresponding mechanism was also discussed in detail, which might pave the way for building high-performance electrical devices based on high-strength suspended graphene film.

Automated summary

It is challenging to fabricate large-area suspended graphene film with good mechanical properties, especially for chemical vapor deposition (CVD)-grown graphene films. This study systematically investigates the mechanical properties of suspended CVD-grown graphene film, revealing that the stability on circular holes can be greatly improved by increasing the layer of graphene films. The mechanical properties of multilayer graphene films prepared by layer-layer stacking process can be increased by up to 400% for the same size, paving the way for building high-performance electrical devices based on high-strength suspended graphene film.