Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA.
ACS Appl Mater Interfaces. 2009 Sep;1(9):1843-6. doi: 10.1021/am900362x.
Uniform high-quality iron oxide thin films can be formed from the spin coating of iron oxide/hydroxide sol-gels on a silicon substrate. Thermal processing of the films at temperatures of approximately 300 degrees C results in the transformation of films into a ternary layered structure with iron oxide, Fe(2)O(3), at the surface, characterized by Mossbauer spectroscopy, and reduced, metallic iron characterized by depth profiling of the surface by X-ray photoelectron spectroscopy as a function of Ar(+) etching. Imaging of the etched surface by scanning electron microscopy reveals two distinct regions at the interface, nanoparticles that are very iron-rich separated by an unstructured region that is somewhat less iron-rich. The results demonstrate a synthetic protocol for the spontaneous formaton of a ternary layered structure from a simple one-step preparation.
在硅衬底上旋涂氧化铁/氢氧化物溶胶-凝胶，可以形成均匀高质量的氧化铁薄膜。将薄膜在约 300°C 的温度下进行热处理，导致薄膜转变为具有表面铁氧化物 Fe(2)O(3)的三元层状结构，这可以通过穆斯堡尔光谱学来表征，并且通过 X 射线光电子能谱法对表面进行深度剖析，可以确定还原的金属铁，其特征是随着 Ar(+)刻蚀的进行。通过扫描电子显微镜对蚀刻表面进行成像，揭示了界面处两个不同的区域，富含铁的纳米颗粒被结构不太丰富的区域隔开。这些结果证明了从简单的一步制备自发形成三元层状结构的合成方案。
