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小粒子结构一直是人们关注的研究热点,上世纪70年代运用暗场像技术发现了具有多重孪晶结构的正二十面体和正十面体结构。近年来,人们已经能够合成直径只有几纳米、结构复杂的纳米粒子,传统的高分辨像和衍射等方法难以获得这些纳米粒子的结构。本文以直径约6nm的FePt粒子为研究对象,通过系列欠焦像波函数重构获得了该粒子亚埃分辨率高分辨相位像,并对该相位像进行了数字暗场像分析研究,通过结构重构并结合高分辨像模拟测定该粒子具有二十面体结构,为确定具有复杂结构的纳米粒子结构提供了一种新途径。
Small particle structure has been a hot topic of concern. In the 70s of last century, the use of dark field imaging technology found the structure of icosahedron and tetrahedron with multiple twins. In recent years, people have been able to synthesize nano-particles with a few nanometers in diameter and complicated structures. The traditional methods such as high-resolution imaging and diffraction are difficult to obtain the structures of these nano-particles. In this paper, a FePt particle with a diameter of about 6nm is taken as the research object. The high-resolution phase image of the particle is obtained by reconstruction of the under-focus imagery wave function, and the digital dark field image analysis of the phase image is carried out. Reconstruction and combined with high-resolution imaging simulation of the particle has an icosahedral structure, in order to determine the complex structure of the nanoparticle structure provides a new way.