Figure 4: Device demo of the waving potential and the scalability.
(a) Contraction force detected by a force sensor connected to gastrocnemius muscle of a fog. Insets show contraction of the muscle by stimulating its sciatic nerve using the waving potential of a graphene sheet being inserted into 0.6 M NaCl solution at ~1 m s−1: original state (left), contracting state (middle) and restored state to original (right). (b) Series connection of graphene samples I and II (2 × 10 cm2, ~11 kΩ) across the surface of 0.6 M NaCl solution at v=55 cm s−1 can amplify the produced voltage (I+II). (c) Parallel connection of the two samples can scale up the current (I|II). Insets illustrate how the samples are connected together for measurements.
