▎ 摘　　要

NOVELTY - Preparing core-shell gold-tinoxide/vertical graphene micro-electrode involves preparing tin oxide film by magnetron sputtering on tantalum wire under inert gas environment, soaking the obtained tantalum wire obtained into tetrachloroauric acid alcohol solution with the concentration of 0.01-100 mM for 1-2 hours, drying, subjecting the obtained tantalum wire to direct current arc plasma chemical vapor deposition under mixed atmosphere of hydrogen and methane for 1-9 minutes to obtain the gold-tinoxide/vertical graphene micro-electrode. The magnetic field voltage is set tobe 5.8-6.2 volt, when the direct current arc plasmachemical vapor deposition. The arc current is 80-100 amperes. The arc power is 6000-6500 watt. The temperature is 800-1100° C, with specific direct current arc plasma chemical vapor deposition device of the sample cavity inert gas. The ratio of hydrogen to methane is (10-20): (15-25): (1-3). USE - Method for preparing core-shell gold-tinoxide/vertical graphene micro-electrode used as plant sensor for detecting plant hormone (claimed). ADVANTAGE - The method enables to detect plant hormone such as abscisic acid, accurate detection and fast detection. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for detecting plant hormone, which involves: establishing the three electrode system is core-shell gold-tinoxide/vertical graphene micro-electrode; connecting electrically the three-electrode system with electrochemical working station; preparing multiple standard solution containing different concentration of plant hormone; using the three-electrode system to detect each of the standard solution to obtain the time-current curve of the standard solution; obtaining the average current value of each standard solution by time-current curve; establishing the coordinate system of concentration of plant hormone and the average current value under the concentration of the plant hormone; ubstituting the average current value and concentration of all standard solution into the coordinate system; forming standard curve; fitting the standard curve into linear regression equation of the straight line; obtaining the time-current curve of the object to be measured; obtaining the average current value by time-current curve; and ubstituting the average current value of the object to be measured into the linear regression equation to obtain the concentration of the plant hormone of the object to be measured.