Making electrical contact with a 2D material (graphene, MoSi2, …) can be accomplished lithographically, but this is expensive, tedious, and permanent. Contact probes would be better for many experimental purposes, but metallic probes are almost certain to damage the material.
In a recent article, Gant et al. demonstrate delicate probes made of poly-acrylonitrile carbon fiber. These are easy to make, can be readily positioned on arbitrary 2D samples, and do not damage the sample surface.
Reference: Gant et al., “Lithography-free electrical transport measurements on 2D materials by direct microprobing”, arXiv:1705.07889