辐照缺陷在制备金属纳米颗粒/绝缘体复合材料中的应用研究
文献类型：学位论文
| 作者 | 杨义涛
|
| 答辩日期 | 2012-06 |
| 授予单位 | 中国科学院研究生院 |
| 授予地点 | 北京 |
| 导师 | 张崇宏 |
| 关键词 | 金属纳米颗粒绝缘体复合材料 离子注入 空位型缺陷 镁铝尖晶石 |
| 学位名称 | 博士 |
| 学位专业 | 粒子物理与原子核物理 |
| 其他题名 | The application of irradiation defects in synthesis of metal nanoparticle in insulator |
| 英文摘要 | Because of having merits of both traditional composites and nanomaterials, the composites of dielectrics embedded with metallic nanoparticles have a broad application in many fields. However, there is no an effective way to improve the size discreteness and distribution uniformity of nanoparticles to this day. The core idea of this dissertation is using irradiation defects to adjust the nucleation of metallic nanoparticles for improving the nanoparticles size discreteness and distribution uniformity. In experiment Ar ions were used to irradiated the magnesium-aluminum spinel deposited with Au film on surface at elevated temperature to introduce defects and metal atoms simultaneously in near surface region. It was found that the kinetic energy of incident ions seems to have a greater contribution to metal nanoparticles formation than irradiation fluence, and Au nanoparticles were unstable in the annealing process. Based on these results Cu instead of Au was deposited on specimen surface and Ar ions with higher kinetic energy were used in subsequent experiment. After irradiation the observation of SPR absorbance peak in UV-VIS spectrum indicated the formation of Cu nanoparticles. TEM results revealed that Cu nanoparticles with diameter of 1.3-3.4nm dispersed in the matrix. The Cu nanoparticle thermal stability has also been improved evidently. However, the agglomeration of Cu, which had an influence on the specimen’s absorbance property, occurred on surface at elevated temperature. To avoid the influence of metal film on absorbance property Ag ions were implanted directly into the layer rich in irradiation defects produced by Ar ions irradiation in the next experiment. UV-VIS results showed enhanced nucleation of metallic nanoparitlces in the specimen rich in defects. PAS Doppler broadening spectrum identified that the defects promoted the nucleation of metallic nanoparticle were vacancy type defects. TEM results revealed that the introduction of irradiation defects can improve the size discreteness and distribution uniformity. In subsequent annealing experiment it was found that the inversion of Mg2+ and Al3+ occurred in temperature range of 600-700℃，which caused the increase of lattice constant, but had little influence on specimen crystallization. |
| 源URL | [http://ir.impcas.ac.cn/handle/113462/17602]  |
| 专题 | 近代物理研究所_能源材料研究组 近代物理研究所_材料研究中心 |
| 作者单位 | 中国科学院近代物理研究所 |
| 推荐引用方式 GB/T 7714 | 杨义涛. 辐照缺陷在制备金属纳米颗粒/绝缘体复合材料中的应用研究[D]. 北京. 中国科学院研究生院. 2012. |
入库方式： OAI收割
来源：近代物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。