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首页> 外文会议>Symposium on Radiation Effects and Ion-Beam Processing of Materials; 20031201-20031205; Boston,MA; US >Characterization of Nanoclusters in MgO Created by Means of Ion Implantation
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Characterization of Nanoclusters in MgO Created by Means of Ion Implantation

机译：通过离子注入在MgO中形成纳米团簇的表征

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摘要

Metal nanoclusters (NCs) of lithium, zinc, silver and gold embedded in MgO were created by means of ion implantation of Li, Zn, Ag and Au ions into single crystals of MgO(100) and subsequent thermal annealing. Nanoclusters of the compound semiconductor CdSe were obtained by implantation of both Cd and Se ions. Solid noble gas clusters were formed by Kr ion implantation. Optical and structural properties of the NCs were investigated using optical absorption spectroscopy (OAS), high-resolution X-ray diffraction (XRD) and cross-sectional transmission electron microscopy (XTEM). The mean nanocluster size is estimated from the broadening of the Mie plasmon optical absorption bands using the Doyle formula. These results are compared with the NC size as obtained from XRD (using the Scherrer formula) and from direct XTEM observations. The three methods are found to be in reasonable agreement with a mean size of 4.0 and 10 nm found for the Au and Ag clusters, respectively. Using TEM observations, the relative interface energies of MgO//Au and MgO//Ag interfaces are also determined. In the case of MgO//Au, they are found not to be in agreement with theoretical predictions in the literature. CdSe nanoclusters were found to adopt different crystal structures dependent on the size. Small ones (<5 nm) appear to have a rock salt structure, larger ones the sphalerite structure. The solid krypton NC's are under high pressure. The pressure of individual Krypton bubbles was determined from the moire fringes.
机译：通过将Li，Zn，Ag和Au离子离子注入MgO（100）单晶并随后进行热退火，可以创建嵌入MgO的锂，锌，银和金的金属纳米簇（NC）。通过注入Cd和Se离子获得化合物半导体CdSe的纳米簇。固体稀有气体团簇通过Kr离子注入形成。使用光学吸收光谱（OAS），高分辨率X射线衍射（XRD）和横截面透射电子显微镜（XTEM）研究了NC的光学和结构性质。使用Doyle公式根据Mie等离子体激元光吸收带的展宽来估计平均纳米团簇的大小。将这些结果与从XRD（使用Scherrer公式）和直接XTEM观测获得的NC尺寸进行比较。发现这三种方法与Au和Ag团簇的平均尺寸分​​别为4.0 nm和10 nm合理吻合。使用TEM观察，还可以确定MgO // Au和MgO // Ag界面的相对界面能。在MgO // Au的情况下，发现它们与文献中的理论预测不一致。发现CdSe纳米团簇根据尺寸采用不同的晶体结构。较小的（<5 nm）似乎具有岩盐结构，较大的则具有闪锌矿结构。固态k NC处于高压下。从莫尔条纹确定各个K气泡的压力。

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