材料期刊网

本文采用气相还原法制备了MoS2包覆TiO2的一维纳米复合材料,首先用水热法制备TiO2纳米管,并制备前驱体（NH42）MoS4;用浸渍法将（NH4）2MoS4附着于TiO2纳米管表面;然后利用氢气还原前驱体得到MoS2包覆层。用X射线衍射（XRD）、扫描电镜（SEM）和透射电镜（TEM）表征所得产物的结构及微观形貌。结果表明当还原反应温度较高（≥600℃）时,产物呈烧结状态,而当反应温度为500℃时,可以得到表面均匀包覆MoS2的TiO2纳米管复合材料,其中包覆层MoS2的结晶程度较低。在此基础上,本文提出了该产物的生长模型,并对包覆前后的样品做荧光性能分析。

MoS2@TiO2 one-dimensional nano-composite was synthesized by chemical vapor deposition method,with TiO2 nanotubes as templates and high purity（NH4）2MoS4 nanocrystals as precursors,respectively.The TiO2 nanotubes with a uniform diameter and high purity were fabricated by hydrothermal method,and（NH4）2MoS4 nanocrystals were synthesized by a simple chemical reaction.MoS2@TiO2 composite formed after loading（NH4）2MoS4 nanoparticles on the surfaces of the TiO2 nanotube bundles and reduced by H2 at different temperatures.The products were investigated by X-ray diffractometry（XRD）,scanning electron microscopy（SEM） and transmission electron microscopy（TEM）.The results show that when the reduction temperature is higher than 600℃,the products will be sintered,while MoS2@TiO2 composite nanotubes can be obtained at 500℃.XRD and HRTEM reveal that for the product obtained at 500℃,the MoS2 was continuously and uniformly coated on TiO2 nanotube bundles with a lower crystalline degree.Photoluminescence（PL） study of TiO2 nanotubes and MoS2@TiO2 composite nanotubes reveal that after having been coated with MoS2,the PL intensity of nanotubes decreased.It means the adding of MoS2 may change the photo-catalyze mechanism of TiO2 nanotubes.Furthermore,the growth model of MoS2@TiO2 composite nanotubes was presented.