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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

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Building Structures Atom by Atom via Electron Beam Manipulation.

Ondrej Dyck^1,2, Songkil Kim³, Elisa Jimenez-Izal^4,5

¹The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.

Small (Weinheim an Der Bergstrasse, Germany)

|August 28, 2018

Summary

This summary is machine-generated.

Researchers used a scanning transmission electron microscope to precisely manipulate silicon atoms in graphene. This breakthrough enables atom-by-atom nanofabrication and the study of atomic-scale chemistry in 2D materials.

Keywords:

atomic control electron beam graphene scanning transmission electron microscope silicon dimer

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Area of Science:

Materials Science
Nanotechnology
Surface Science

Background:

Single-atom manipulation is crucial for advanced materials fabrication.
Scanning tunneling microscopy has been the primary tool for atom manipulation.
New methods are needed for controlled assembly of atomic structures.

Purpose of the Study:

To demonstrate controlled manipulation and assembly of few-atom structures using a scanning transmission electron microscope (STEM).
To introduce and control silicon (Si) substitutional defects and defect clusters in graphene at the atomic level.
To investigate beam-induced atomic-scale chemical processes in two-dimensional (2D) materials.

Main Methods:

Utilizing an atomically focused electron beam in a STEM for precise defect engineering in graphene.
Inducing and controlling the motion of individual Si atoms within the graphene lattice.
Manipulating Si substitutional defects to form dimers, trimers, and more complex atomic arrangements.
Capturing the dynamics of beam-induced atomic-scale chemical processes using time-series atomic-resolution imaging.

Main Results:

Demonstrated controlled introduction and spatial positioning of Si substitutional defects and defect clusters in graphene with nanometer precision.
Achieved controlled motion and assembly of individual Si atoms to create specific few-atom structures.
Observed and recorded the real-time dynamics of electron beam-induced atomic-scale chemical reactions.
Successfully formed dimers, trimers, and other complex Si structures within the graphene lattice.

Conclusions:

Control of electron beam-induced local processes in STEM represents a significant advancement in atom-by-atom nanofabrication.
This technique provides a powerful tool for studying atomic-scale chemistry in 2D materials.
Enables the fabrication of precisely defined structures and defects with atomic specificity, paving the way for novel nanomaterials.