碳纤维/二氧化锡复合材料的结构及相关性质

Structure and Properties of Carbon Fiber/SnO_2 Composites

对碳纤维表面进行修饰,通过低温液相沉淀法制备碳纤维/二氧化锡复合材料.X射线衍射谱和拉曼光谱研究表明得到的SnO2具有六角金红石相结构,晶粒尺寸很小,复合材料中纳米尺寸的SnO2可能具有氧缺陷以及晶格扭曲.由紫外-可见吸收谱计算出二氧化锡的带隙约为3.90 eV.此外,与空气气氛下退火样品的光致发光谱相结合,得出样品宽的黄光发射带可能归于氧空位,这由拉曼光谱给出的结构分析得到支持.

A core-shell structure material,carbon fiber/SnO2 was prepared by a surface modification precipitation process in aqueous solution.The energy bandgap calculated from the absorptive spectra was about 3.90 eV.The study of PL spectra of the samples showed that there was a broad yellow emission band centered at 583 nm in the wavelength range 450~700 nm.Moreover,combined with the PL spectrum annealed in air,the broad yellow emission band may be attributed to the oxygen vacancies,which is supported by results from Raman study.Moreover,the yellow emission in PL spectrum may be attributed to the crystal defects.