Figure 1
From: Mapping the conductivity of graphene with Electrical Resistance Tomography
(a) Photograph of the contact fixture. (b) Side-view drawing of the fixture. (c,d) Details of the 16 spring-loaded electrodes. The fixture accepts 1 × 1 cm samples. A sample is first loaded on a milled plastic support and then the actuator lever is operated to lift the sample until it makes contact with the spring-loaded needles. The electrodes touch the sample at 500 μm from its edges. The diameter of each needle tip is 40 μm. The vertical-rail loading mechanism limits the applied force to 0.15 N.
