Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 15 March 2002:
Vol. 295. no. 5562, pp. 2053 - 2055
DOI: 10.1126/science.1069325
Prev | Table of Contents | Next

Reports

Atom-Resolved Imaging of Dynamic Shape Changes in Supported Copper Nanocrystals

Poul L. Hansen,1* Jakob B. Wagner,12 Stig Helveg,1 Jens R. Rostrup-Nielsen,1 Bjerne S. Clausen,1 Henrik Topsøe1

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.

1 Haldor Topsøe A/S, Nymøllevej 55, DK-2800 Kgs. Lyngby, Denmark.
2 NBIfAFG, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark.
*   To whom correspondence should be addressed. E-mail: plh{at}topsoe.dk

Read the Full Text


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Preferential Growth of Single-Walled Carbon Nanotubes with Metallic Conductivity.
A. R. Harutyunyan, G. Chen, T. M. Paronyan, E. M. Pigos, O. A. Kuznetsov, K. Hewaparakrama, S. M. Kim, D. Zakharov, E. A. Stach, and G. U. Sumanasekera (2009)
Science 326, 116-120
   Abstract »    Full Text »    PDF »
Nanometric chemical clocks.
J.-S. McEwen, P. Gaspard, T. V. de Bocarme, and N. Kruse (2009)
PNAS 106, 3006-3010
   Abstract »    Full Text »    PDF »
Shape Changes of Supported Rh Nanoparticles During Oxidation and Reduction Cycles.
P. Nolte, A. Stierle, N. Y. Jin-Phillipp, N. Kasper, T. U. Schulli, and H. Dosch (2008)
Science 321, 1654-1658
   Abstract »    Full Text »    PDF »
The Roles of Subsurface Carbon and Hydrogen in Palladium-Catalyzed Alkyne Hydrogenation.
D. Teschner, J. Borsodi, A. Wootsch, Z. Revay, M. Havecker, A. Knop-Gericke, S. D. Jackson, and R. Schlogl (2008)
Science 320, 86-89
   Abstract »    Full Text »    PDF »
Cu nanocrystal growth on peptide nanotubes by biomineralization: Size control of Cu nanocrystals by tuning peptide conformation.
I. A. Banerjee, L. Yu, and H. Matsui (2003)
PNAS 100, 14678-14682
   Abstract »    Full Text »    PDF »
Real-Time Monitoring of Growing Nanoparticles.
G. Renaud, R. Lazzari, C. Revenant, A. Barbier, M. Noblet, O. Ulrich, F. Leroy, J. Jupille, Y. Borensztein, C. R. Henry, et al. (2003)
Science 300, 1416-1419
   Abstract »    Full Text »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)