废弃玉米苞叶制备碳化硅纳米颗粒

Synthesis of SiC nanoparticle from corn bract wastes

以废弃的玉米苞叶和正硅酸乙酯（TEOS）为原料,硝酸钴为催化剂,在氩气保护气氛下通过碳热还原反应制备出均匀分布的碳化硅纳米颗粒。采用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和荧光光谱仪（PL）对所得碳化硅进行表征。结果表明：制得的均匀分布的β-SiC纳米颗粒尺寸介于15-60nm。激发波长为290nm时,样品具有最强的发射峰。当激发波长从290nm增加到330nm时,发射峰位置固定在466nm;当激发波长从330nm增加到390nm时,发射峰位置出现了明显的蓝移。

SiC nanoparticles were synthesized by the carbothermal reduction,in which corn husks wastes and tetraethoxysi lane （TEOS） were respectively employed as carbon and silica precursors,cobalt nitrate as additive. X-ray diffraction,scanning electron microscope,transmission electron microscope and photoluminescence were used to characterize the SiC samples. The results showed that the β-SIC nanoparticles with a diameter of 15-60nm. The nanoparticle showed strong emission peak under the excita tion wavelength of 290nm. The emission peak at 466nm was observed when the excitation wavelength was shifted from 290 to 330nm. In addition,as the excitation wavelength was shifted from 330 to 390nm,the blue shift is observed.