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Interfacing biomolecules and cells to electronic materials is a longstanding challenge to manufacture sensitive biosensors and inexpensive diagnostic devices.[1] Single-layer graphene (SLG) has emerged as a promising material for this purpose because of its transparency, conductivity, robust mechanical properties, and high surface area.[2] Recent developments in its synthesis using chemical-vapor-deposition methods [3] provide large-area, high-quality SLG that is easily transferred to a variety of substrates. For example, SLG that was supported on reconstituted silk formed the basis of a wireless biosensor that was adsorbed onto tooth enamel and detected pathogens in saliva.[4] The function and specificity of such biosensors rely on assembling active recognition elements on the SLG surface, ideally through noncovalent interactions that preserve its superior electronic properties. Noncovalent-functionalization …