3d structures formed from flat graphene film

Researchers at the University of Illinois have developed a way to create 3-D structures in 2-dimensional graphene film. The structures could contribute to the development of hybrid micro-electromechanical systems.

The university writes this on its news blog. Using the so-called wet transfer technique, the researchers were able to create various three-dimensional geometric structures, such as pyramids, pillars and domes. We also succeeded in integrating gold nanoparticles on the structures. The latter is important in order to integrate the structures with other nanomaterials.

The research paper published in Nano Letters states that it is the first time that 3D microstructures have been successfully transferred from the substrate on which the graphene film was formed to the film, without causing serious damage. The maximum size of the out-of-plane structures was 50 micrometers. To ensure that the graphene film does not tear, the film has to be formed, as it were, ‘over’ a 3D substrate that is somewhat too large: the substrate is then still ‘swollen’ with the aid of a solvent. Thereafter, the substrate must shrink slightly due to evaporation of the solvent. The film then forms over the mold without tearing, although some wrinkles and creases remain due to the shrinkage.

Possible applications lie in the production of micro-electromechanical systems or mems. These systems consist of various electronic, mechanical and chemical components.