Journal article
In Situ Ptychography of Heterogeneous Catalysts using Hard X-Rays: High Resolution Imaging at Ambient Pressure and Elevated Temperature
Karlsruhe Institute of Technology1
Center for Electron Nanoscopy, Technical University of Denmark2
Surface Physics and Catalysis, Department of Physics, Technical University of Denmark3
German Electron Synchrotron4
Technische Universität Dresden5
University of Bremen6
European Synchrotron Radiation Facility7
A new closed cell is presented for in situ X-ray ptychography which allows studies under gas flow and at elevated temperature. In order to gain complementary information by transmission and scanning electron microscopy, the cell makes use of a Protochips E-chipTM which contains a small, thin electron transparent window and allows heating.
Two gold-based systems, 50 nm gold particles and nanoporous gold as a relevant catalyst sample, were used for studying the feasibility of the cell. Measurements showing a resolution around 40 nm have been achieved under a flow of synthetic air and during heating up to temperatures of 933 K. An elevated temperature exhibited little influence on image quality and resolution.
With this study, the potential of in situ hard X-ray ptychography for investigating annealing processes of real catalyst samples is demonstrated. Furthermore, the possibility to use the same sample holder for ex situ electron microscopy before and after the in situ study underlines the unique possibilities available with this combination of electron microscopy and X-ray microscopy on the same sample.
Language: | English |
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Year: | 2016 |
Pages: | 178-88 |
ISSN: | 14358115 and 14319276 |
Types: | Journal article |
DOI: | 10.1017/S1431927615015573 |
ORCIDs: | Damsgaard, Christian Danvad and Wagner, Jakob Birkedal |
X-ray microscopy annealing heterogeneous catalysis in situ nanoporous gold ptychography synchrotron radiation
Hot Temperature Hydrostatic Pressure Microscopy X-Ray Diffraction