Nanosecond electron pulses in the analytical electron microscopy of a fast irreversible chemical reaction.

Abstract:

:We show how the kinetics of a fast and irreversible chemical reaction in a nanocrystalline material at high temperature can be studied using nanosecond electron pulses in an electron microscope. Infrared laser pulses first heat a nanocrystalline oxide layer on a carbon film, then single nanosecond electron pulses allow imaging, electron diffraction and electron energy-loss spectroscopy. This enables us to study the evolution of the morphology, crystallography, and elemental composition of the system with nanosecond resolution. Here, NiO nanocrystals are reduced to elemental nickel within 5 µs after the laser pulse. At high temperatures induced by laser heating, reduction results first in a liquid nickel phase that crystallizes on microsecond timescales. We show that the reaction kinetics in the reduction of nanocrystalline NiO differ from those in bulk materials. The observation of liquid nickel as a transition phase explains why the reaction is first order and occurs at high rates.

journal_name

Nat Commun

journal_title

Nature communications

authors

Sinha SK,Khammari A,Picher M,Roulland F,Viart N,LaGrange T,Banhart F

doi

10.1038/s41467-019-11669-w

subject

Has Abstract

pub_date

2019-08-13 00:00:00

pages

3648

issue

1

issn

2041-1723

pii

10.1038/s41467-019-11669-w

journal_volume

10

pub_type

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