▎ 摘　　要

NOVELTY - Preparing silicon carbene comprises (i) taking high-purity graphene and silene, and taking nano-silicon carbide powder and gallium and iron nano-powder, placing in a mechanical stirrer; (ii) placing the mixed sample in a graphite boat and placing a graphite boat carrying a mixture of diaminosilylene, graphene and nano silicon carbide on the sample holder of the sample reaction chamber; (iii) installing a variable frequency heating electric furnace for heating in the lower part of the sample chamber of the reaction chamber, equipping the reaction chamber with a femtosecond laser; (iv) evacuating to 10-3 Torr, turning on the electric furnace to heat to 500-1000 degrees C; (v) turning on the high-frequency plasma discharge and turning on the high-frequency magnetic field; (vi) aligning the laser radiation with the sample scan; (vii) maintaining the reaction chamber; and (viii) turning off the laser power supply and electric furnace heating power supply and collecting the product of the sample. USE - The method is useful for preparing silicon carbene. ADVANTAGE - The silicon carbene can be grown under conditions of high temperature laser irradiation of silylene and graphene. DETAILED DESCRIPTION - Preparing silicon carbene comprises (i) taking high-purity graphene and silene, and taking nano-silicon carbide powder and gallium and iron nano-powder, placing in a mechanical stirrer, adding acetone, sealing, stirring, allowing to stand and taking out in the vacuum drying box for drying; (ii) placing the mixed sample in a graphite boat and placing a graphite boat carrying a mixture of diaminosilylene, graphene and nano silicon carbide on the sample holder of the sample reaction chamber; (iii) installing a variable frequency heating electric furnace for heating in the lower part of the sample chamber of the reaction chamber, equipping the reaction chamber with a femtosecond laser, vacuum pump, ring sample collector and a direct source of the laser gun nozzle, placing a magnet tile around the reaction chamber to generate a static magnetic field and applying a coil around the reaction chamber to generate a high-frequency electromagnetic field; (iv) evacuating to 10-3 Torr, turning on the electric furnace to heat to 500-1000 degrees C, turning on the laser and aligning the sample point by point; (v) turning on the high-frequency plasma discharge and turning on the high-frequency magnetic field and restricting inertially the flow direction so the soot is repeatedly mixed and reacting in the air; (vi) aligning the laser radiation with the sample scan until the sample in the graphite boat is laser ablated; (vii) maintaining the reaction chamber temperature at 500-1000 degrees C for 10 minutes; and (viii) turning off the laser power supply and electric furnace heating power supply, high frequency electromagnetic field power supply and magnetic field, cooling naturally and collecting the product of the sample. INDEPENDENT CLAIMS are also included for: (1) silicon carbene as a monolayer cubic silicon carbide structure composed of a silicone oxide and a graphene double layer, the layer of carbon atoms is covalently bonded to form a hexagonal ring, the layer of silicon atoms is also covalently bonded to form a hexagonal ring, the silicon atom and a carbon atom layer are connected by a covalent bond between a silicon atom and a carbon atom and all bonds are sp3 hybrid bonds. The chemical formula of the crystal structure is ((SixC(1-x))n) (I). x = 0-1; and n = 1. The x is the atomic weight percentage and the n is the number of silicon carbide units composed of one carbon atom and one silicon atom; (2) silicon carbon photovoltaic material; (3) preparing hydrogen using photo-decomposing water vapor of silicon carbene, comprising depositing a cobalt-iron alloy layer on the surface of the silicon olefin particles by photodeposition to obtain a cobalt iron silicon carbene nanoparticle having a cobalt-iron alloy layer mass fraction of 0.05-2.0%, immersing the cobalt iron-silicone-carbon nanoparticles in a dye-methanol solution of 0.05-0.5 mmol/l, placing in the dark for 48-72 hours to filter, rinsing with de-ionized water for 5-10 times and placing in a vacuum oven and drying at 80-200 degrees C for 12-24 hours to obtain dye-sensitized cobalt iron silicon carbene nanoparticles and adding dye-sensitized cobalt iron silicon carbene nanoparticle into a volume of 150 ml of concentration of 10-20% triethanolamine TEOA or a mixture of methanol and triethanolamine in an aqueous solution reactor using ultrasonic sample solution for 5-30 minutes and passing argon gas for 10-60 minutes to obtain uniform cobalt iron-silicone olefin nanoparticle colloidal suspension in the absence of oxygen, applying a static magnetic field, adding a transparent all-light concentrating mirror to illuminate the photocatalytic reactor, starting magnetic stirring and determining the hydrogen gas generated in the reaction vessel quantitatively by a gas chromatograph and photocatalytic activity.