▎ 摘　　要

NOVELTY - A graphene composite (100) comprises a photoswitchable layer (110) configured to reversibly change between a hydrophobic state and a hydrophilic state, a graphene layer (115) disposed on the photoswitchable layer and a substrate (105), where the photoswitchable layer is disposed between the substrate and the graphene layer. USE - Graphene composite for use in device that is sensor for sensing analytes such as aromatic molecule, nucleotide, nucleoside, pesticide, polyaromatic hydrocarbon, metal ion, and an enantiomer, in a sample (all claimed). ADVANTAGE - The graphene composite has hydrophobic and hydrophilic properties. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method of making a graphene composite, which involves providing a substrate, forming a photoswitchable layer on the substrate, and applying graphene to the photoswitchable layer, where the photoswitchable layer is configured to reversibly change between a hydrophobic state and a hydrophilic state (2) a method, which involves providing a graphene composite comprising a photoswitchable layer configured to reversibly change between a hydrophobic state and a hydrophilic state, a graphene layer disposed on the photoswitchable layer and a substrate, followed by applying a first radiation to the photoswitchable layer effective to cause a portion of the photoswitchable layer to be in the hydrophobic state and applying a second radiation to the photoswitchable layer effective to cause a portion of the photoswitchable layer to be in the hydrophilic state, where the photoswitchable layer is disposed between the substrate and the graphene layer (3) a method for sensing analytes in a sample, which involves providing a graphene composite comprising a photoswitchable layer configured to reversibly change between a hydrophobic state and a hydrophilic state, a graphene layer disposed on the photoswitchable layer and a substrate, followed by applying a first radiation to the photoswitchable layer effective to cause a portion of the photoswitchable layer to be in the hydrophobic state, contacting the sample with the graphene layer while the photoswitchable layer is in the hydrophobic state, applying a first voltage to the graphene layer such that a first current flows in the graphene layer, and measuring the first current in the graphene layer while the first voltage is applied, where the photoswitchable layer is disposed between the substrate and the graphene layer (4) a device comprising a graphene composite comprising a photoswitchable layer configured to reversibly change between a hydrophobic state and a hydrophilic state, a graphene layer disposed on the photoswitchable layer and a substrate, a first light source configured to apply a first radiation to the photoswitchable layer effective to cause a portion of the photoswitchable layer to be in the hydrophobic state, and a second light source configured to apply a second radiation to the photoswitchable layer effective to causea portion of the photoswitchable layer to be in the hydrophilic state (5) a system for making a graphene composite, which involves a controller, a photoswitchable layer applicator configured through the controller to apply a photoswitchable layer, or a precursor to a substrate and a graphene applicator configured through the controller to apply graphene to the photo switchable layer. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a graphene composite. Graphene composite (100) Substrate (105) Photoswitchable layer (110) Graphene layer (115)