TY - JOUR

T1 - Effect of Particle Morphology on the Ripening of Supported Pt Nanoparticles

A1 - Simonsen,Søren Bredmose

A1 - Chorkendorff,Ib

A1 - Dahl,Søren

A1 - Skoglundh,Magnus

A1 - Meinander,Kristoffer

A1 - Jensen,Thomas N.

A1 - Lauritsen,Jeppe Vang

A1 - Helveg,Stig

AU - Simonsen,Søren Bredmose

AU - Chorkendorff,Ib

AU - Dahl,Søren

AU - Skoglundh,Magnus

AU - Meinander,Kristoffer

AU - Jensen,Thomas N.

AU - Lauritsen,Jeppe Vang

AU - Helveg,Stig

PB - American Chemical Society

PY - 2012

Y1 - 2012

N2 - To improve the understanding of sintering in diesel and lean-burn engine exhaust after-treatment catalysts, we examined oxygen-induced sintering in a model catalyst consisting of Pt nanoparticles supported on a planar, amorphous Al2O3 substrate. After aging at increasing temperatures, a transmission electron microscopy analysis reveals that a highly monodispersed ensemble of nanoparticles transformed into an ensemble with bimodal and subsequently Lifshitz–Slyozov–Wagner particle size distribution. Moreover, scanning transmission electron microscopy and atomic force microscopy analyses suggest that the Pt nanoparticle had size-dependent morphologies after sintering in the oxidizing environment. The evolution of the particle sizes is described by a simple kinetic model for ripening, and the size-dependent particle morphology is proposed as an explanation for the observed bimodal particle size distribution shape.

AB - To improve the understanding of sintering in diesel and lean-burn engine exhaust after-treatment catalysts, we examined oxygen-induced sintering in a model catalyst consisting of Pt nanoparticles supported on a planar, amorphous Al2O3 substrate. After aging at increasing temperatures, a transmission electron microscopy analysis reveals that a highly monodispersed ensemble of nanoparticles transformed into an ensemble with bimodal and subsequently Lifshitz–Slyozov–Wagner particle size distribution. Moreover, scanning transmission electron microscopy and atomic force microscopy analyses suggest that the Pt nanoparticle had size-dependent morphologies after sintering in the oxidizing environment. The evolution of the particle sizes is described by a simple kinetic model for ripening, and the size-dependent particle morphology is proposed as an explanation for the observed bimodal particle size distribution shape.

U2 - 10.1021/jp2098262

DO - 10.1021/jp2098262

JO - The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter

JF - The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter

SN - 1932-7447

IS - 9

VL - 116

SP - 5646

EP - 5653

ER -