【摘要】 以金属钛粉为钛源、多壁碳纳米管为反应性模板碳源,采用熔盐法在KCl-LiC体系中合成TiC-MWCNT复合材料,并通过混合空气氧化制备TiO2-MWCNT复合材料。采用X射线衍射、傅里叶变换红外光谱、紫外-可见漫反射光谱和扫描电镜对上述产物的晶相结构、光谱特征和表面微观结构进行分析。结果表明,TiC-MWCNTs经过控制氧化后,仍然保持MWCNTs的基本管状形貌,TiC颗粒氧化生成TiO2并均匀地涂覆在多壁碳纳米管表面;TiO2-MWCNT复合材料中TiO2以锐钛矿相存在,平均晶粒尺寸约为13 nm,该复合材料在紫外光和可见光区域都具有良好的光吸收性能。更多还原

【Abstract】 Using titanium powder as a metal source and multi-walled carbon nanotubes(MWCNTs) as a reactive carbon source,TiC-MWCNT composites were synthesized in a KCl-LiCl molten salt reaction medium.TiO2-MWCNT composites were prepared by oxidizing TiC-MWCNTs in flowing air.The crystal structure,spectra characteristics and morphology of the composites were characterized by X-ray diffraction,Fourier transform infrared spectroscopy,UV-Vis diffuse reflectance spectroscopy and scanning electron microscopy.The results reveal that the composites keeps the original tubular morphology after TiC formation and subsequent controlled oxidation.TiC particles are oxidized to anatase TiO2 phase which is uniformly coated on the surface of MWCNTs.The average diameter of TiO2 particles on MWCNTs is about 13 nm.The prepared composites show excellent ultraviolet and visible light absorption ability.更多还原