▎ 摘　　要

NOVELTY - The strain gauge (10) comprises a substrate (12), a thin film of overlapping, two-dimensional flakes (14, 16) deposited on the substrate, and a structure responsive to conductance across the film so that a strain induced change in overlap area between neighboring flakes results in a change in conductance across the film. The two-dimensional flakes are graphene. The films have a sensitivity of conductance to strain that is tuned by varying morphology of the film. The morphology includes a film thickness, a flake size, and a non-electrically conductive film. USE - The strain gauge is useful in implantable devices for health monitoring, transparent force-sensitive touch screens, large scale pressure sensors, micromechanical resistive strain sensors and structural health monitoring of complex surfaces. ADVANTAGE - The strain gauge can be economically fabricated with high sensitivity and stability and increased reliability. DETAILED DESCRIPTION - The strain gauge (10) comprises a substrate (12), a thin film of overlapping, two-dimensional flakes (14, 16) deposited on the substrate, and a structure responsive to conductance across the film so that a strain induced change in overlap area between neighboring flakes results in a change in conductance across the film. The films have a sensitivity of conductance to strain that is tuned by varying morphology of the film. The morphology includes a film thickness, a flake size, and a non-electrically conductive film. The substrate is a plastic, glass or ceramic substrate. The film is deposited by airbrush deposition from a graphene flake solution. A spacing between flakes is smaller than flake size. The morphology produces a ten-fold increase in strain gauge sensitivity compared to metal film gauges. DESCRIPTION OF DRAWING(S) - The diagrams show schematic views of a strain gauge. Strain gauge (10) Substrate (12) flakes. (14, 16)