▎ 摘　　要

NOVELTY - Ship exhaust gas sensing material comprises graphene, where the graphene is prepared by using alcohol to wipe the quartz glass, folding the copper foil of 8 x 5 centimeter in the center at 90 degrees . The copper foil is placed into the quartz glass and pushed it into the quartz. The heating area in the middle of the furnace tube, the quartz furnace tube is connected to a mechanical pump, and after the nozzle is closed, the mechanical pump is opened to draw the pressure in the quartz furnace tube to below 1 mtorr. The residual gas in the quartz furnace tube is pumped clean, hydrogen at 110 standard milliliter/minute is passed in, and the pressure is controlled at 490 mtorr. The pressure is stabilized, the heater is then turned on and the heating operation is started. USE - Ship exhaust gas sensing material. ADVANTAGE - The ship exhaust gas sensing material is cost-effective, stable and reliable, improves the whole efficiency and reliability of operation. DETAILED DESCRIPTION - Ship exhaust gas sensing material comprises graphene, where the graphene is prepared by using alcohol to wipe the quartz glass, folding the copper foil of 8 x 5 centimeter in the center at 90 degrees . The copper foil is placed into the quartz glass and pushed it into the quartz. The heating area in the middle of the furnace tube, the quartz furnace tube is connected to a mechanical pump, and after the nozzle is closed, the mechanical pump is opened to draw the pressure in the quartz furnace tube to below 1 mtorr. The residual gas in the quartz furnace tube is pumped clean, hydrogen at 110 standard milliliter/minute is passed in, and the pressure is controlled at 490 mtorr. The pressure is stabilized, the heater is then turned on and the heating operation is started. The temperature is increased to 1000?OC. The furnace tube is heated to 1000 degrees C, hydrogen of 110 standard milliliter/minute is continuously passed, and the annealing is maintained for 90 minutes to remove the original oxide layer on the copper foil. After 90 minutes of annealing, CH11 is added as a reaction gas at 11 standard milliliters/minute, and the pressure is maintained at 540 mtorr and 1000 degrees C, methane is cracked into carbon and hydrogen atoms due to high temperature. The atoms are deposited on the copper foil and bonded to each other to form graphene, while the hydrogen atoms are taken away by the carrier gas hydrogen, and the growth process is maintained for 60 minutes. The quartz furnace tube stops heating, and the methane supply is suspended first, hydrogen supply is continued for 40 minutes, when the temperature of the furnace tube drops to about 600 degrees C, the hydrogen supply is stopped and the furnace tube is reduced to remove the quartz glass at room temperature. INDEPENDENT CLAIMS are included for the following: (1) a ship exhaust gas sensing element device, which comprises a ship exhaust gas sensing material; and (2) a sensing device of a graphene gas sensor, comprises a gas measurement cavity, and a carrier is arranged in the gas measurement cavity, and the sensing element is installed in the gas measurement cavity, sensing element is the ship exhaust gas sensing element device.