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The effects of encapsulation on damage to molecules by electron radiation

Skowron, Stephen T.; Roberts, Sarah L.; Khlobystov, Andrei N.; Besley, Elena

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Authors

Stephen T. Skowron

Sarah L. Roberts



Abstract

Encapsulation of materials imaged by high resolution transmission electron microscopy presents a promising route to the reduction of sample degradation, both independently and in combination with other traditional solutions to controlling radiation damage. In bulk crystals, the main effect of encapsulation (or coating) is the elimination of diffusion routes of beam-induced radical species, enhancing recombination rates and acting to limit overall damage. Moving from bulk to low dimensional materials has significant effects on the nature of damage under the electron beam. We consider the major changes in mechanisms of damage of low dimensional materials by separating the effects of dimensional reduction from the effects of encapsulation. An effect of confinement is discussed using a model example of coronene molecules encapsulated inside single walled carbon nanotubes as determined from molecular dynamics simulations calculating the threshold energy required for hydrogen atom dissociation. The same model system is used to estimate the rate at which the nanotube can dissipate excess thermal energy above room temperature by acting as a thermal sink.

Journal Article Type Article
Acceptance Date Feb 19, 2019
Online Publication Date Feb 21, 2019
Publication Date May 31, 2019
Deposit Date Mar 19, 2019
Publicly Available Date Feb 22, 2020
Journal Micron
Print ISSN 0968-4328
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 120
Pages 96-103
DOI https://doi.org/10.1016/j.micron.2019.02.007
Keywords Cell Biology; Structural Biology
Public URL https://nottingham-repository.worktribe.com/output/1666181
Publisher URL https://www.sciencedirect.com/science/article/pii/S0968432819300320?via%3Dihub

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