通过金属铁片与酒石酸钠(C4H4O6Na2)在140℃水热反应12h,在金属铁片上原位大面积生长出了Fe3O4纳米片.采用扫描电子显微镜、X射线衍射仪和透射电子显微镜对产物进行表征.结果表明,所制备的Fe3O4纳米片为单晶立方相结构,其尺寸范围为1.2μm×1.4μm～4.0μm×4.2μm,厚度约为60nm.通过改变溶液中碱的浓度可实现不同尺寸纳米片的可控合成.研究了酒石酸钠在Fe3O4纳米片的形成过程中的作用,提出了可能的生长机理. Fe3O4 nanosheets were grown in situ on metal iron plates by hydrothermal reaction of metal iron with sodium tartrate (C4H4O6Na2) at 140 ℃ for 12h. The products were characterized by scanning electron microscopy, X-ray diffraction and transmission electron microscopy .The results show that the prepared Fe3O4 nanosheets are single crystal cubic phase with the size range of 1.2μm × 1.4μm ~ 4.0μm × 4.2μm and the thickness of about 60nm.Different sizes of nano-particles can be achieved by changing the concentration of alkali in the solution The controllable synthesis of tablets was studied.The effect of sodium tartrate on the formation of Fe3O4 nanosheets was studied and the possible growth mechanism was proposed.