In_2O_3介孔微米片的水热法制备及生长机理研究

Fabrication of Mesoporous In_2O_3 Microflakes by Hydrothermal Method and Their Growth Mechanism Study

利用水热法结合热处理技术,以In(NO_3)3、蔗糖和Na_2SO_4为原料制备了In_2O_3六边形微米片。微米片为立方相多晶结构,直径达到十余个微米、厚度仅有100~150 nm,内部多孔。微米片的氮气吸脱附等温线表明材料属于介孔材料,孔径分布于25~125 nm,产物的BET比表面积只有12.8 cm3/g,可能是表面颗粒覆盖了内部孔洞造成。分析了材料的生长机理,认为SO_42-的配位作用既减缓了前驱体的生长速度,又使前驱体颗粒相互组装形成微米片,蔗糖改善了分散性。

In the work, In_2O_3 microflaks were successfully synthesized by hydrothermal method using In（NO_3）3, sucrose and Na2SO_4 as raw materials. SEM and TEM images indicated that the C-In_2O_3 porous products show as hexagonal microflaks with a side length of more than ten micrometers and a thickness of 100~150 nm. Nitrogen adsorption–desorption isotherm confirms mesoporous properties, and the porous size concentrates between 25 and 125 nm. While the BET specific surface area only was 12.8 cm^3/g, this may be caused by the surface covering of the internal holes. Possible growth mechanisms were also proposed： the coordination effects between In^（3＋） and SO_42-, may play the leading roles in the formation of C-In2O_3 crystal phases and their self-assembly. And, sucrose was regarded as the main reasons to improve the dispersion situation of the products.