單晶中植入納米晶微結(jié)構(gòu)及光電性能研究

單晶α-Al2O3、MgO、YSZ和TiO2在室溫下分別注入Ni＋和Zn＋離子，然后在氧化氣氛中退火，以形成金屬及其氧化物納米晶。形成的納米復(fù)合結(jié)構(gòu)分別采用X射線光電子能譜(XPS)表征各元素化學(xué)價(jià)態(tài)；用X射線衍射分析(XRD)檢測(cè)納米結(jié)構(gòu)的結(jié)晶形態(tài)；用透射電子顯微分析(TEM)觀察納米晶的微觀結(jié)構(gòu)及分布情況；吸收光譜和熒光光譜分別用來表征納米復(fù)合結(jié)構(gòu)的宏觀光學(xué)性能；超導(dǎo)量子干涉磁強(qiáng)計(jì)(SQUID)測(cè)量磁性納米晶的矯頑力及截止溫度。研究表明：在幾種單晶材料中分別形成的金屬Ni和Zn具有表面等離子共振吸收效應(yīng)，ZnO納米晶具有較強(qiáng)的綠光發(fā)射，鐵磁性金屬Ni納米晶具有比常規(guī)塊材大的矯頑力。這些性能在光學(xué)濾波片、藍(lán)/綠發(fā)光器件和磁存儲(chǔ)器方面極具應(yīng)用前景。

Ni+ and Zn+ ion implantations were performed at room temperature in α-Al2O3, MgO, YSZ, and TiO2 single crystals and then annealed in oxidized atmosphere in order to fabricate metal and its oxide nanoparticles. The micro-structural and macro-properties of nanocomposites were examined by different methods: X-ray Photoelectron Spectroscopy(XPS), X-Ray Diffraction(XRD), Transmission Electron Microscopy(TEM), optical spectroscopy, and Superconducting Quantum Interference Device (SQUID) magnetometer, respectively. Metallic Ni and Zn nanoparticles have special Surface Plasma Resonance(SPR) absorption. ZnO nanoparticles in α-Al2O3 showed a strong green emission band. The coercive force of ferromagnetic Ni nanoparticles was larger than that of bulk materials of Ni. These properties may provide potential applications in optical filters, green/blue light-emitting devices and high density magnetic data storage devices