论文标题
赤铁矿的原子结构（$α$ -fe $ _2 $ o $ _3 $）纳米底面;同步加速器X射线衍射研究
Atomic Structure of Hematite ($α$-Fe$_2$O$_3$) Nanocube Surface; Synchrotron X-ray Diffraction Study
论文作者
论文摘要
单分散性赤铁矿的原子结构（$α$ -fe $ _2 $ o $ _3 $）纳米cube $（0 1 \ bar1 2）$表面由Synchrotron X射线衍射确定。 $α$ -FE $ _2 $ o $ _3 $纳米纸是通过热液过程制备的，并用滴铸件将单层的纳米管沉积在硅基板上。通过放牧发动机X射线衍射确认了纳米接管与其$（0 1 \ bar1 2）$表面的对齐。已经测量了从宏观的单晶体$（0 1 \ bar1 2）$表面的CTR上，已经测量了从应有的和真空退火的纳米底面表面的镜面晶体截断杆（CTR）。从纳米管表面进行的测量的CTR可以很好地解释了顶部Fe层中一半原子的原子结构模型，而多余的氧气层覆盖了半错的Fe层。在水热纳米接管过程中，提出了酸性环境作为差异的主要原因。
Atomic structure of a mono-dispersive hematite ($α$-Fe$_2$O$_3$) nanocube $(0 1\bar1 2)$ surface was determined with synchrotron X-ray diffraction. The $α$-Fe$_2$O$_3$ nanocubes were prepared through a hydrothermal process and a single layer of nanocubes was deposited on a silicon substrate with a drop cast method. The alignment of nanocubes with their $(0 1\bar1 2)$ surfaces parallel to the substrate is confirmed with grazing incidence X-ray diffraction. Specular crystal truncation rods (CTR's) from as-prepared and vacuum annealed nanocube surfaces have been measured and they are drastically different from previously reported CTR's from macroscopic single crystal $(0 1\bar1 2)$ surfaces. The measured CTR's from nanocube surfaces are explained well with the atomic structure models of half of atoms in top Fe layer being missing while extra oxygen-layers cover the half-missing Fe layer. An acidic environment during hydrothermal nanocube synthesis process is proposed as the main cause of the difference.
