溶胶-凝胶和碳热还原法制备塔状SiC纳米棒

Silicon carbide nanorods were synthesized by sol-gel and carbothermal reduction processing with TEOS (tetraethoxysilane), PVP (polyvinylpyrrolidone) as starting materials and Fe(NO3)3 as catalyst. The composition and morphologies of the resulting SiC were investigated by XRD,29Si MAS-NMR and TEM techniques. Results show that the morphologies of the resulting sample are tower likeβ-SiC nanorods which typically have a tower base width between 80nm and 100nm, a step layer thickness of about 10nm between two layers and a height from 0.4 to 1.0 micrometers. The corresponding selected area electron diffraction pattern indicates that the growth direction of the nanorods is parallel to 111. It is believed that the SiC nanorods are formed by a kinetically controlled process catalyzed by Fe under a supersaturated CO vapor.