Journal ArticleDOI
Atom-Resolved Imaging of Dynamic Shape Changes in Supported Copper Nanocrystals
Poul L. Hansen,Jakob Birkedal Wagner,Stig Helveg,Jens R. Rostrup-Nielsen,Bjerne S. Clausen,Henrik Topsøe +5 more
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TLDR
In situ transmission electron microscopy is used to obtain atom-resolved images of copper nanocrystals on different supports, which are catalysts for methanol synthesis and hydrocarbon conversion processes for fuel cells.Abstract:
In situ transmission electron microscopy is used to obtain atom-resolved images of copper nanocrystals on different supports. These are catalysts for methanol synthesis and hydrocarbon conversion processes for fuel cells. The nanocrystals undergo dynamic reversible shape changes in response to changes in the gaseous environment. For zinc oxide-supported samples, the changes are caused both by adsorbate-induced changes in surface energies and by changes in the interfacial energy. For copper nanocrystals supported on silica, the support has negligible influence on the structure. Nanoparticle dynamics must be included in the description of catalytic and other properties of nanomaterials. In situ microscopy offers possibilities for obtaining the relevant atomic-scale insight.read more
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In situ manipulation of the active Au-TiO2 interface with atomic precision during CO oxidation.
Wentao Yuan,Beien Zhu,Ke Fang,Xiaoyan Li,Thomas Willum Hansen,Yang Ou,Hangsheng Yang,Jakob Birkedal Wagner,Yi Gao,Yong Wang,Ze Zhang +10 more
TL;DR: Using aberration-corrected environmental transmission electron microscopy, Wang et al. as discussed by the authors studied the interface between gold (Au) and a titanium dioxide (TiO2) support and found an unexpected dependence of the atomic structure of the Au-TiO 2 interface with the epitaxial rotation of gold nanoparticles on a TiO2 surface during carbon monoxide (CO) oxidation.
Journal ArticleDOI
In situ Transmission Electron Microscopy of catalyst sintering
TL;DR: In this paper, the authors focus on in situ electron microscopy studies of catalysts that shed light on the mechanistic aspects of catalyst sintering and find that the smallest particles are found to disappear in a few seconds as soon as the catalyst reaches the operating temperature.
Journal ArticleDOI
1s2p Resonant Inelastic X-ray Scattering of Iron Oxides
Frank M. F. de Groot,Pieter Glatzel,Uwe Bergmann,Peter A. van Aken,Raúl A. Barrea,Stephan Klemme,Michael Hävecker,Axel Knop-Gericke,Willem M. Heijboer,Bert M. Weckhuysen +9 more
TL;DR: It is concluded that the full power and possibilities of 1s2p RIXS needs an overall resolution of 0.3 eV, which will yield a technique with more detailed information than K-edge and L-edge X-ray absorption combined, obtained in a single experiment.
Journal ArticleDOI
Single molecule methods for the study of catalysis: from enzymes to heterogeneous catalysts
Kris P. F. Janssen,Gert De Cremer,Robert K. Neely,Alexey V. Kubarev,Jordi Van Loon,Johan A. Martens,Dirk De Vos,Maarten B. J. Roeffaers,Johan Hofkens +8 more
TL;DR: This tutorial review provides a broad overview of key concepts and developments in the application of single molecule fluorescence spectroscopy to (bio)catalysis research and topics specific to both bio and heterogeneous catalysis will be reviewed in more detail.
Journal ArticleDOI
Surface oxides on close-packed surfaces of late transition metals
TL;DR: In this paper, a review of surface oxides on late transition metals has been presented, focusing on the structures found, and it is shown that the surfaces oxides share some general properties with the corresponding bulk oxides.
References
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Journal ArticleDOI
Controlled growth of monodisperse silica spheres in the micron size range
TL;DR: In this article, a system of chemical reactions has been developed which permits the controlled growth of spherical silica particles of uniform size by means of hydrolysis of alkyl silicates and subsequent condensation of silicic acid in alcoholic solutions.
Journal ArticleDOI
Semiconductor Clusters, Nanocrystals, and Quantum Dots
TL;DR: In this article, the authors focus on the properties of quantum dots and their ability to join the dots into complex assemblies creates many opportunities for scientific discovery, such as the ability of joining the dots to complex assemblies.
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Journal ArticleDOI
Photoinduced conversion of silver nanospheres to nanoprisms.
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Journal ArticleDOI
Some interesting properties of metals confined in time and nanometer space of different shapes.
TL;DR: Some of the observed new chemical, optical, and thermal properties of metallic nanocrystals when their size is confined to the nanometer length scale and their dynamical processes are observed on the femto- to picosecond time scale are described.