Unravelling Kinetic and Thermodynamic Effects on the
Growth of Gold Nanoplates by Liquid Transmission Electron Microscopy
Damien Alloyeau
Walid Dachraoui
Yasir Javed
Hannen Belkahla
Guillaume Wang
Hélène Lecoq
Souad Ammar
Ovidiu Ersen
Andreas Wisnet
Florence Gazeau
Christian Ricolleau
10.1021/acs.nanolett.5b00140.s001
https://acs.figshare.com/articles/journal_contribution/Unravelling_Kinetic_and_Thermodynamic_Effects_on_the_Growth_of_Gold_Nanoplates_by_Liquid_Transmission_Electron_Microscopy/2179054
The
growth of colloidal nanoparticles is simultaneously driven by kinetic
and thermodynamic effects that are difficult to distinguish. We have
exploited in situ scanning transmission electron microscopy in liquid
to study the growth of Au nanoplates by radiolysis and unravel the
mechanisms influencing their formation and shape. The electron dose
provides a straightforward control of the growth rate that allows
quantifying the kinetic effects on the planar nanoparticles formation.
Indeed, we demonstrate that the surface-reaction rate per unit area
has the same dose-rate dependent behavior than the concentration of
reducing agents in the liquid cell. Interestingly, we also determine
a critical supply rate of gold monomers for nanoparticle faceting,
corresponding to three layers per second, above which the formation
of nanoplates is not possible because the growth is then dominated
by kinetic effects. At lower electron dose, the growth is driven by
thermodynamic and the formation and shape of nanoplates are directly
related to the twin-planes formed during the growth.
2015-04-08 00:00:00
nanoparticle
Liquid Transmission Electron MicroscopyThe growth
nanoplate
formation
scanning transmission electron microscopy
electron dose