水热法制备石墨烯/碱式硫酸镁晶须的复合粉体

Hydrothermal preparation of graphene/ whiskery magnesium hydroxidesulfate composite powders

摘要:

以无水硫酸镁、氨水及氧化石墨为原料,以十二烷基苯磺酸钠为表面活性剂,采用水热法制备了石墨烯/碱式硫酸镁晶须复合粉体,研究了水热温度和保温时间对产物物相组成及形貌的影响。采用X射线衍射(XRD),扫描电子显微镜(SEM)和透射电子显微镜(TEM)对产物进行了表征。结果表明：1)水热温度为190℃时可制备出含有大量晶须的石墨烯/碱式硫酸镁晶须的复合粉体；2)延长保温时间有利于晶须的生长,9h反应后试样中碱式硫酸镁晶须的数量最少,而12h和15h反应后试样中碱式硫酸镁晶须的数量明显增多。

Abstract:

Grapheme/ whiskery magnesium hydroxide sulfate composite powders were prepared by hydrothermal synthesis method with anhydrous magnesium sulfate, ammonia and graphite oxide as raw material, and sodium dodecy benzene sulfonic acid as surface active agent in this paper. The effect of hydrothermal synthesis temperature and holding time on the preparation of grapheme/ whiskery magnesium hydroxide sulfate composite powders were discussed. The phase composition, microstructure of the products were investigated by powder X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED). It indicated that: 1) The magnesium hydroxide sulfate whisker can be synthesized under the hydrothermal temperature of 190℃. 2) Increasing holding time was beneficial to the growth of whisker, there are only few of whiskers formed at holding time of 9h, however, the quantity of the whisker evidently increases as the holding time increases to 12h and 15h.