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. 2017 Mar 21;8:14902. doi: 10.1038/ncomms14902

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(a) Scanning electron microscope (SEM) images of graphene single-crystal domain. (b) Photograph of the sensor composed of multi-G-FETs with a microfluidic channel along with solution inlet and outlet as labelled. (c) Cross-sectional view of an individual G-FET device. (d) Optical micrograph of the sensor with multi-G-FET detecting channels.