单分散MnO纳米粒子的可控制备

Controllable synthesis of monodisperse MnO nanoparticles

研究了不同实验条件对MnO纳米粒子尺寸和形貌调控的影响.采用高温分解法以油酸锰为前驱体成功可控制备了3nm、6nm、10nm、20nm等多种粒径的MnO纳米粒子,并通过透射电子显微镜对其进行了表征.结果表明:反应温度、表面活性剂用量、溶剂用量等对纳米粒子的大小都有一定的影响.随着反应温度的升高,MnO纳米粒子的尺寸逐渐增加,而表面活性剂的用量增大则导致MnO纳米粒子的尺寸变小,增加溶剂用量有利于合成较大尺寸的MnO纳米粒子.此外,还分别用CTAB、DMSA、多巴胺等对MnO纳米粒子进行修饰,结果显示表面经亲水性处理后纳米粒子增加了水溶性,使其更好地用于生物成像和载药.

The morphology of manganese oxide （MnO） nanoparticles significantly affects their properties and various applications. In this paper, we report controllable synthesis and characterization of MnO nanoparticles （3 nm, 6 nm, 10 nm, 20 nm） through the high- temperature decomposition approach. Our results showed that the reaction temperature, the amount of surfactants and solvent affect the size of the nanoparticles. MnO nanoparticles size increases with temperature and solvent content. However,increase of surfactants leads to decrease in the particle size. Finally, we modified the MnO nanoparticles with CTAB, DMSA and dopamine to render their aqueous solubility, which is essential for their biological applications.