CTAB对水热合成纳米MoS_2颗粒的影响研究

EFFECT OF CTAB ON THE PREPARATION OF MoS_2 NANOPARTICLES BY HYDROTHERMAL SYNTHESIS

以仲钼酸铵((NH4)6Mo7O24·4H2O)为钼源,硫脲(CS(NH2)2)为硫源和还原剂,阳离子表面活性剂CTAB为分散剂,采用水热法合成了纳米Mo S2。为防止产物团聚、抑制其长大并控制其形貌,添加了不同浓度的阳离子表面活性剂CTAB,对水热合成过程进行了控制研究,通过XRD和SEM对产物物相纯度和形貌进行表征,从微观结构理论的角度分析了CTAB加入对反应过程和产物形貌及分散性的影响。结果显示,阳离子表面活性剂CTAB的加入对产物Mo S2的结晶粒度和结晶度有影响,同时又起着模板和分散剂的作用。当其添加量为5倍的临界胶束浓度时,对抑制产物的团聚和形貌的修饰作用最强。

Nanoscale Mo S2 was successfully prepared by hydrothermal reaction in which ammonium heptamolybdate（（ NH4）6Mo7O24.4H2O） was used as Mo-source and thiourea（ CS（ NH2）2） as S-source and reducing agent. Different concentrations of CTAB were added into the system to resist Mo S2 powder from being reunited and to control morphology as well. X-ray diffraction（ XRD）,scanning electron microscopy（ SEM） techniques were used to characterize the samples,controlling effects of adding CTAB on resulted particles and reaction process was analyzed by microstructure theory. The results showed that particle size and crystallinity of the resultants was modified greatly by adding cationic surfactant CTAB,which acted a critical role as dispersion and template. The best effects of adding CTAB on restraining reunion and modifying morphology of resultants can get when adding amount of CTAB which is about 5 times of the Critical Micelle Concentration（ CMC）.