溶剂热法合成六方氮化硼纳米晶的影响因素研究

以Li_3N和BBr3为原料,采用溶剂热法在220 ℃合成了h-BN纳米晶,研究了反应时间、表面活性剂和诱导晶粒对产物的影响.研究结果表明:反应产物主要为h-BN,同时含有少量c-BN,随着反应时间从12 h延长至36 h,晶粒尺寸从20 nm增大至80 nm;十二烷基苯磺酸钠的引入可以控制产物颗粒尺寸在10 nm左右,并且使球形度得到提高;以h-AlN为诱导晶粒时,产物中六方相含量增加,并且出现了h-BN纳米棒.

Study on Influence Factors of h-BN Nanocrystals Prepared by Solvothermal Method

Hexagonal boron nitride nanocrystals were prepared by solvothermal method at 220 ℃ using Li_3N and BBr3 as raw materials. The effects of reaction time, surfactant and induced seeds on the production waere studied. The experimental results indicate that the hexagonal boron nitride was the dominant production and cubic boron nitride could be also found. The size of the crystals grew from 20 nm to 80 nm as the reaction time extended from 12 h to 36 h. With the addition of surfactant, the crystal size could be limited to 10 nm and the degree of sphericity improved. The content of hexagonal phase increased with the addition of h-AlN seeds, and some rod like h-BN nanocrystals appeared in the production.