  Chemical vapor deposition (CVD) has been widely adopted as the most scalable
method to obtain single layer graphene. Incorporating CVD graphene in planar
devices can be performed via well established wet transfer methods or thermal
adhesive release. Nevertheless, for applications involving 3D shapes, methods
adopted for planar surface provide only a crude solution if a continuous,
tear-free, wrinkle-free graphene layer is required. In this work, we present
the fabrication and characterization of PDMS-supported 3D graphene probes. To
accommodate 3D geometries, we perform CVD on catalysts possessing a non-trivial
3D topology, serving to mold the grown graphene to a final non-trivial 3D
shape. This advance overcomes challenges observed in standard transfer
processes that can result in uneven coverage, wrinkles and tears. To
demonstrate the potential of our new transfer approach, we apply it to
fabricate graphene electrical probes. Graphene, due to its flexibility,
transparency and conductivity, is an ideal material with which to replace
conventional metal based probes. In particular, with a contact resistance in
the order of tens of kOhm, these graphene probes may find applications, such as
in electrophysiology studies.
