▎ 摘　　要

NOVELTY - The device (100) has first and second graphene grains (110, 112) including a grain boundary (120) formed between the graphene grains, where the second graphene grain is in contact with the first graphene grain. First and second electrodes (130, 132) are operatively coupled to the graphene grains. The electrodes are placed within about 20 micrometer of the grain boundary. An electrical measurement system (150) is coupled to the electrodes, where the electrical measurement system measures electrical properties of the grain boundary. USE - Graphene-based chemical sensing device for use as a chemical sensing FET (chemFET) in a chemical sensing system (all claimed) i.e. gas sensing system, for photonics, high frequency electronics and nano-electromechanical systems for mass detection and biological sensing applications. ADVANTAGE - The device improves sensitivity of carbon-based chemical sensors toward gas molecules due to an efficient physisorption and enhanced charge transfer process. The device performs annealing in hydrogen to improve copper substrate quality by reducing nucleating points and improve response of the device by interrogating an area immediately surrounding a grain boundary. DETAILED DESCRIPTION - The electrical properties are resistance or impedance electrical properties. INDEPENDENT CLAIMS are also included for the following: (1) a method for sensing an analyte (2) a chemical sensing system. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic plan view of a sensing device. Sensing device (100) Graphene grains (110, 112) Grain boundary (120) Electrodes (130, 132) Electrical measurement system (150)