Topological descriptions of grain boundaries in graphene

Annevelink, Emil

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https://hdl.handle.net/2142/101630 Copy

Description

Title

Topological descriptions of grain boundaries in graphene

Author(s)

Annevelink, Emil

Issue Date

2018-07-20

Director of Research (if dissertation) or Advisor (if thesis)

• Johnson, Harley T.
• Ertekin, Elif

Department of Study

Mechanical Sci & Engineering

Discipline

Mechanical Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• Graphene
• Grain Boundary
• displacement shift complete
• dislocation

Abstract

Since 2004, when monolayer graphene was first experimentally isolated, proof-of-concept graphene devices have added new functionality to engineering devices. As these devices become geared toward commercial applications, the development of high-throughput manufacturing methods that produce consistent properties become necessary. Defect engineering provides a promising method to tune the properties of graphene. Grain boundaries made of 5-7 dislocations are the most prominent defect in graphene and have been shown to be responsible for variability in properties. Therefore, we analyze how to change the structure of graphene through control of grain boundary motion. We analyze grain boundary motion--accomplished by moving individual dislocations--through both topological and energetic considerations. We use each method to show the equivalence of displacement shift complete lattice dislocations and grain boundary kinks. We show that all grain boundary kinks have dislocation character by verifying that graphene grain boundaries can be modeled by the displacement shift complete lattice. This allows us to think of altering the type and structure of graphene grain boundaries using the linear elastic theory of dislocations to nucleate and propagate grain boundary kinks.

Graduation Semester

2018-08

Type of Resource

text

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http://hdl.handle.net/2142/101630

Copyright and License Information

Copyright 2018 Emil Annevelink

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