- 2D Crystals
|Title||Graphene transfer to 3-dimensional surfaces: a vacuum-assisted dry transfer method|
|Publication Type||Journal Article|
|Year of Publication||2017|
|Authors||Morin, J. L. P., Dubey N., Decroix F. E. D., Luong-Van E. K., Neto A. H. Castro, and Rosa V.|
|Keywords||3d, chemical-vapor-deposition, cvd, cvd growth, dry transfer, graphene, implants, in-vitro, large-area, layer graphene, mesenchymal stem-cells, osteogenic differentiation, Raman microspectroscopy, raman-spectroscopy, repeated growth, single-crystal graphene|
Chemical vapour deposition (CVD) grown graphene presents an efficient synthetic route for large-scale graphene production, however, current transfer methods are focused on transferring graphene onto planar substrates. Here, we describe a method to uniformly transfer CVD-grown graphene onto 3D objects with high shape complexity. Due to its promises as a coating for medical applications, we investigated graphene transfer onto commercially available titanium implants with different geometries using a vacuum-assisted dry transfer method. A self-standing graphene-polymer tape is obtained by spin coating of a silicone polymer on the graphene, followed by the addition of a support layer, and the electrochemical delimitation of the growth substrate. The tape is then wrapped around the object and placed into a mould to conform to the surface. Using a pressure differential provided via partial vacuum, a uniform force is applied to the surface. Graphene characteristics are assessed by Raman spectroscopy and AFM. 74% and 95% coverage yields are obtained after a single transfer and double transfer respectively, with an observed increase in the number of graphene layers and an overall decrease in defect contributions. In vitro cell assays demonstrate that the coating is non-cytotoxic enabling further exploration of this method for medical applications.
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