离子诱发白云母表面纳米结构的研究

发布时间：2018-05-17 15:26

本文选题：白云母 + 纳米小丘结构　；参考：《兰州大学》2015年硕士论文

【摘要】：本工作分两部分,第一部分利用北京师范大学2x1.7MV串列静电加速器产生的1-2MeVLi+、0.34-3.75MeVCn+、1-6MeVOn+和4.5-10.5MeVCln+辐照常温下的白云母,第二部分利用上海应物所加速器产生的0.65MeVHe+辐照不同外界温度下的白云母。所有辐照后云母样品均用轻敲模式下的原子力显微镜(atomic force microscopy,AFM)扫描和观察,在云母表面发现了纳米小丘结构并测量了小丘的高度和直径。首先,我们研究了探针曲率半径和扫描范围对小丘尺寸的影响,发现不同曲率半径的原子力探针测量的lithium样品小丘结构的高度不受探针影响,而直径用相应的函数修正后在误差范围内相等；不同AFM扫描区域的小丘高度和直径大小存在一定的比例关系。其次,我们研究了小丘高度、直径与辐照离子电子能损的关系。对于Li+, Cn+,On+诱发的小丘,离子电子能损相近时,小丘高度和直径相近。当能损大于1.2KeV/nm时,小丘的高度与底部直径随着能损的增大线性增大；当能损低于1.2keV/nm时,小丘高度和直径不受能损影响。C1离子能损高于3.5keV/nm时,其诱发的小丘的高度和直径随着能损增大而减小,该现象首次发现,3.5keV/nm可能是“气化”阈值。第二部分实验发现,He+在常温下诱发的小丘的高度和直径要小于高温下诱发的小丘高度和直径。
[Abstract]:This work is divided into two parts. In the first part, we use 1-2MeVLi 0.34-3.75MeVCn (1-6MeVOn) produced by 2x1.7MV tandem electrostatic accelerator of Beijing normal University and Muscovite irradiated by 4.5-10.5MeVCln at room temperature. In the second part, Muscovite at different temperature is irradiated by 0.65MeVHe produced by Shanghai accelerator. All irradiated mica samples were scanned and observed by atomic force microscopy (AFM) in the light knock mode. The nanoscale structure was found on the surface of mica and the height and diameter of the mica were measured. First of all, we study the influence of probe radius and scanning range on the size of the mound. It is found that the height of the mound structure of the lithium sample measured by atomic force probe with different curvature radii is not affected by the probe. The diameter is equal in the error range with the corresponding function, and there is a certain proportional relationship between the height of the hillock and the diameter of the different AFM scanning area. Secondly, we studied the relationship between the height, diameter and electron energy loss of irradiated ions. For the cumulus induced by Li, Cn on, the height and diameter of the cumulus are similar when the ion electron energy loss is close. When the energy loss is greater than 1.2KeV/nm, the height and the bottom diameter of the mound increase linearly with the increase of the energy loss, and when the energy loss is lower than 1.2keV/nm, the height and diameter of the mound are not affected by the energy loss. C1 ion energy loss is higher than that of 3.5keV/nm. The height and diameter of the induced colliculus decrease with the increase of energy loss. It is the first time that 3.5keV / nm may be the threshold of "gasification". In the second part, it is found that the height and diameter of the hillock induced by he is smaller than that of the one induced by high temperature.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1

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