期刊
NANO LETTERS
卷 22, 期 9, 页码 3628-3635出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c00213
关键词
structure determination; small organic molecules; scanning transmission electron microscopy; atomic resolution; graphene support
类别
资金
- Packard foundation fellowship
- NSF CAREER award [DMR-1846206]
- NSF-MRSEC award [DMR-1720633]
Here, we demonstrate atomic-resolution scanning transmission electron microscopy (STEM) imaging of light elements in small organic molecules on graphene. Our approach involves low-dose, room-temperature, aberration-corrected STEM to create high-quality composite images, with sufficient resolution to distinguish individual carbon and nitrogen atoms.
Here, we demonstrate atomic-resolution scanning transmission electronmicroscopy (STEM) imaging of light elements in small organic molecules on graphene.We use low-dose, room-temperature, aberration-corrected STEM to image 2Dmonolayer and bilayer molecular crystals, followed by advanced image processingmethods to create high-quality composite images from similar to 102-104individual molecules.In metalated porphyrin and phthalocyanine derivatives, these images contain anelementally sensitive contrast with up to 1.3 A resolution???sufficient to distinguishindividual carbon and nitrogen atoms. Importantly, our methods can be applied tomolecules with low masses (similar to 0.6 kDa) and nanocrystalline domains containing just a few hundred molecules, making it possible tostudy systems for which large crystals cannot easily be grown. Our approach is enabled by low-background graphene substrates,which we show increase the molecules'critical dose by 2-7x. These results indicate a new route for low-dose, atomic-resolutionelectron microscopy imaging to solve the structures of small organic molecules
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据