Electron tomography of nanoparticle catalysts on porous supports: A new technique based on Rutherford scattering

被引:102
作者
Weyland, M
Midgley, PA
Thomas, JM
机构
[1] UCL Royal Inst Great Britain, Davy Faraday Res Lab, London W1X 4BS, England
[2] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England
关键词
D O I
10.1021/jp011566s
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report a new variant of three-dimensional (3D) electron microscopy, Z-contrast tomography, in which, by use of a field-emission gun scanning transmission electron microscope equipped with a high-angle annular dark-field detector, images are formed by Rutherford scattered electrons. The intensity of such electrons is approximately proportional to Z(2) (Z being the atomic number of the scattering atom) so that the technique preferentially images high-Z materials distributed over low-Z supports. The 3D structure of nanoparticles catalysts, as well as that of the porous support (and especially the precise location of the former on the latter), is reconstructed from a tilt series of 2D projections by a (real space) tomography procedure using a weighted back projection approach.
引用
收藏
页码:7882 / 7886
页数:5
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