Self-supporting silicon carbide nanowire paper and preparing method thereof

The invention discloses self-supporting silicon carbide nanowire paper and a preparing method thereof, and belongs to the field of nanomateiral preparing and self-assembly technology thereof. The preparing method includes the following steps that methyl trimethoxy silane and dimethyl dimethoxysilane are used as raw materials, nitric acid is used as a crosslinking catalyst, a cohydrolysis method is adopted to prepare silica gel, and then the silica gel is dried to prepare xerogel; the xerogel is put into a graphite crucible with a graphite cover, the graphite crucible is put in an air pressure sintering furnace, air of the air pressure furnace is pumped until the air pressure is 0.1 Pa or below, the air pressure furnace is filled with high-purity argon, the air pressure furnace is heated to 1320-1500 DEG C at the speed of 2-10 DEG C/min, and the temperature is kept for 1 h; the product is cooled to the room temperature along with the furnace, a greyish-green nanowire layer can grow on a graphite substrate and is striped from the graphite substrate to prepare the self-supporting silicon carbide nanowire paper. Self-assembly of nanowires can be achieved in the process of nanowire growth, the thickness of the nanowire paper prepared through the method is adjustable, and the area of the nanowire paper prepared each time is large.