Transient Bimodal Particle Size Distributions during Pt Sintering on Alumina and Silica
Artikel i vetenskaplig tidskrift, 2015

Sintering of Pt nanoparticles dispersed on alumina and two types of silica supports has been investigated under oxidizing conditions by use of transmission electron microscopy. Particle size distributions have been measured and analyzed as a function of time (up to 24 h) and temperature (500, 550, and 600 °C). The measurements reveal transient bimodal and (sometimes) multimodal size distributions as the particles grow from 3 nm to about 10 nm. The likely role of support surface heterogeneity in the formation of bimodal size distributions has been analyzed theoretically. The experiments and the theoretical analysis stress limitations of conventional sintering models that operate with a mean particle size and a uniform support surface. Furthermore, the results underline the difficulties in deducing the dominant sintering mechanism from particle size distributions.

Författare

Pooya Tabib Zadeh Adibi

Kompetenscentrum katalys (KCK)

Chalmers, Teknisk fysik, Kemisk fysik

Vladimir Zhdanov

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

Christoph Langhammer

Chalmers, Teknisk fysik, Kemisk fysik

Henrik Grönbeck

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

Journal of Physical Chemistry C

1932-7447 (ISSN) 1932-7455 (eISSN)

Vol. 119 989-996

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Fysikalisk kemi

Kemiska processer

Nanoteknik

Infrastruktur

Nanotekniklaboratoriet

DOI

10.1021/jp506586g