介孔模板限域法制备SiC纳米颗粒

Synthesis of SiC Nanoparticles by Template Confined Method

以SBA-15介孔二氧化硅为模板,以蔗糖为碳源制备了SiC纳米颗粒.研究了制备温度、升温速率和反应时间对SiC产物的影响.相对较低的制备温度、较快的升温速率、较短的保温时间,能充分发挥介孔模板的限域作用,可制备出尺寸小、分布均匀的SiC纳米颗粒.相对较高的制备温度、较慢的升温速率、较长的保温时间,介孔模板的限域作用减弱,产物中出现更多的SiC纳米线,生成的SiC颗粒也会明显长大.

A template confined method was selected to synthesize silicon carbide （SiC） nanoparticles （NPs）, where ordered mesoporous silica molecular sieve SBA-15 was chosen as the template and sucrose as the carbon source. Experimental results show that the carbothermal reduction temperature and heating rate are the key parameters on synthesizing SiC NPs. Lower temperature, higher heating rate and shorter reaction time are beneficial to SiC NPs formation, whereas higher temperature, lower heating rate and longer reaction time lead to the formation of SiC nanowires. SiC NPs are obtained at carbothermal reduction temperature of 1400℃ and 75 ℃/min heating rate. The unique property of SiC NP provides new opportunities for the exploitation of SiC materials. It might substitute the traditional material to work in the rigorous environments.