Casula Maria F, Jun Young-Wook, Zaziski David J, Chan Emory M, Corrias Anna, Alivisatos A Paul
Department of Chemistry, University of California at Berkeley, Berkeley, California 94720, USA.
J Am Chem Soc. 2006 Feb 8;128(5):1675-82. doi: 10.1021/ja056139x.
A comprehensive study of iron oxide nanocrystal growth through non-hydrolitic, surfactant-mediated thermal reaction of iron pentacarbonyl and an oxidizer has been conducted, which includes size control, anisotropic shape evolution, and crystallographic phase transition of monodisperse iron oxide colloidal nanocrystals. The reaction was monitored via in situ UV-vis spectroscopy, taking advantage of the color change accompanying the iron oxide colloid formation, allowing measurement of the induction time for nucleation. Features of the synthesis such as the size control and reproducibility are related to the occurrence of the observed delayed nucleation process. As a separate source of iron and oxygen is adopted, phase control could also be achieved by sequential injections of oxidizer.
通过五羰基铁与氧化剂的非水解、表面活性剂介导的热反应对氧化铁纳米晶体生长进行了全面研究，该研究包括单分散氧化铁胶体纳米晶体的尺寸控制、各向异性形状演变和晶体相变。利用氧化铁胶体形成时伴随的颜色变化，通过原位紫外-可见光谱对反应进行监测，从而能够测量成核的诱导时间。合成的特征如尺寸控制和可重复性与观察到的延迟成核过程的发生有关。由于采用了铁和氧的单独来源，通过依次注入氧化剂也可以实现相控制。
