电子束辐照诱导二维氧化铟纳米片生长的原位电镜研究  

In situ TEM study of the growth of two⁃dimensional indium oxide nanosheets induced by electron beam irradiation

作　　者：朱亚彤 张昊 徐涛 孙立涛[1] ZHU Ya-tong;ZHANG Hao;XU Tao;SUN Li-tao(SEU-FEI Nano-Pico Center,Key Lab of MEMS of Ministry of Education,Southeast University,Nanjing Jiangsu 210096,China)

机构地区：[1]东南大学—FEI纳皮米中心,MEMS教育部重点实验室,东南大学电子科学与工程学院,江苏南京210096

出　　处：《电子显微学报》2023年第3期275-282,共8页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.61974021);中央高校基本科研业务费资助项目.

摘　　要：非层状二维材料因其新颖的二维特性在电子学、光电子学、催化、能量储存和转换等领域具有广泛的应用前景。然而,其现有的合成方法都无法精确地控制材料的形貌和尺寸,且对材料潜在的生长机制尚不明确。本文利用透射电子显微镜中的高能电子束,辐照诱导了硒化铟纳米片表面氧化铟纳米晶粒的产生,并在原子尺度观察了氧化铟纳米片的原位生长过程。实验发现,氧化铟纳米片沿着{222}晶面以“逐层生长”的方式形成特定的结构,且原子优先在台阶处成核以降低生长过程中的表面能。这一研究表明,电子束辐照可以作为一种有效的工具来制备氧化铟等非层状二维材料,为二维纳米结构的可控制备提供实验和理论依据。Non-layered two-dimensional materials have a wide range of application in the fields of electronics,optoelectronics,catalysis,energy storage and conversion because of their novel two-dimensional properties.However,reported synthetic method are unable to precisely control the morphology and size of two-dimensional materials.The growth mechanism of two-dimensional materials is not yet clear.In this work,high-energy electron beams in a transmission electron microscope were used to trigger the in situ formation of indium oxide nanograins on the surface of indium selenide nanosheets.The atomic-scale observation demonstrates that indium oxide nanosheets grow along the{222}crystal plane in a“layer-by-layer”manner.Atoms preferentially nucleate at the steps to reduce surface energy during the growth.This study shows that electron beam irradiation can be used as an effective tool to prepare non-layered two-dimensional materials such as indium oxide,providing experimental and theoretical basis for the controllable synthesis of two-dimensional nanostructures.

关 键 词：非层状二维材料 电子束辐照 硒化铟 氧化铟 原位生长 

分 类 号：TG115.215.3[金属学及工艺—物理冶金] O48[金属学及工艺—金属学] O76[理学—固体物理]