Finite element analysis and scale-bridging calculations of graphene crinkle

Wang, Xincheng

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Overview

Year:: 2021
Contributor:: Wang, Xincheng (creator); Kim, Kyung-Suk (Advisor); Brown University. Engineering: Mechanics of Solids (sponsor)
Genre:: theses
Subject:: Multiscale modeling; Finite element method; Graphene crinkle
Extent:: 9, 41 p.

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Description

Abstract:: Over a decade, it is known that nanopore sequencing of DNA or RNA requires substantial reduction of entropic noise in the nanopore reading process. Recently, a properly aligned flexoelectric graphene crinkle near the nanopore is proposed to reduce the noise. To this end, a multi-layer graphene (MLG) with a nanopore at its center is suspended over an hourglass-shaped through-thickness hole in a stretched silicon-nitride thin layer. Then, the stretching is released to buckle the MLG film to create a desirable flexoelectric graphene crinkle. In this study, hybrid analyses of multi-stage finite element simulations and a scale-bridging analysis are made to characterize and control the crinkle configuration. In the multi-stage finite element simulations, a homogeneous thin elastic film instead of an MLG is employed to approximately evaluate the displacements along the edges of the hourglass-shaped hole. Then, the displacement is used to obtain MLG's surface slopes and curvature along the crinkle ridge, utilizing the relationship between the slope and the curvature of a quantum-flexoelectric crinkle. The results show that proper MLG crinkles can be created and controlled by simple bending and unbending of the substrate to smoothly feed the DNA or RNA into the nanopore without breaking the device.
Notes:: Thesis (Sc. M.)--Brown University, 2021

Content

Citation

Wang, Xincheng, "Finite element analysis and scale-bridging calculations of graphene crinkle" (2021). Mechanics of Solids Theses and Dissertations. Brown Digital Repository. Brown University Library. https://repository.library.brown.edu/studio/item/bdr:cdq2uedw/

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Mechanics of Solids Theses and Dissertations

Theses and Dissertations for the Mechanics of Solids department.
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