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Revealing local variations in nanoparticle size distributions in supported catalysts: a generic TEM specimen preparation method
Author(s) -
PINGEL TORBEN,
SKOGLUNDH MAGNUS,
GRÖNBECK HENRIK,
OLSSON EVA
Publication year - 2015
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/jmi.12274
Subject(s) - nanoparticle , transmission electron microscopy , materials science , bimetallic strip , scanning electron microscope , scanning transmission electron microscopy , focused ion beam , catalysis , nanotechnology , chemical engineering , ion , composite material , chemistry , metallurgy , metal , organic chemistry , engineering , biochemistry
Summary The specimen preparation method is crucial for how much information can be gained from transmission electron microscopy (TEM) studies of supported nanoparticle catalysts. The aim of this work is to develop a method that allows for observation of size and location of nanoparticles deposited on a porous oxide support material. A bimetallic Pt‐Pd/Al 2 O 3 catalyst in powder form was embedded in acrylic resin and lift‐out specimens were extracted using combined focused ion beam/scanning electron microscopy (FIB/SEM). These specimens allow for a cross‐section view across individual oxide support particles, including the unaltered near surface region of these particles. A site‐dependent size distribution of Pt‐Pd nanoparticles was revealed along the radial direction of the support particles by scanning transmission electron microscopy (STEM) imaging. The developed specimen preparation method enables obtaining information about the spatial distribution of nanoparticles in complex support structures which commonly is a challenge in heterogeneous catalysis.