The effects of encapsulation on damage to molecules by electron radiation

Micron : the International Research and Review Journal for Microscopy
Stephen T SkowronElena Besley

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.

Citations

Oct 30, 2020·Physical Chemistry Chemical Physics : PCCP·Ikumi AkitaTetsu Yonezawa
Jun 25, 2021·Chemical Science·Jack W JordanAndrei N Khlobystov
Aug 21, 2020·ACS Nano·Johannes BiskupekAndrei N Khlobystov
Dec 11, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·A TebyaniS J van der Molen

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