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摘要: 以正硅酸乙酯(TEOS)、聚乙烯基吡咯酮(PVP)为反应前驱体,Fe(NO3)3为催化剂,采用溶胶-凝胶和碳热还原法制得了碳化硅纳米棒。运用XRD、29Si MAS NMR、TEM和SAED等手段对样品的组成和形貌进行了表征。结果表明:产物的形貌为塔状纳米棒,且晶体沿平行于[111]的方向生长;塔形SiC棒的塔底宽约80nm~100nm,塔层厚度10nm左右,长约0.4μm~1.0μm。在催化剂Fe的作用下,过饱和CO气氛中的动力学控制过程导致了塔状SiC纳米棒的形成。Abstract: 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.
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Key words:
- β-SiC /
- Towerlike /
- Nanorods /
- Sol-gel /
- Carbothermal reduction
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