title: Emergence of Chemical Oscillations from Nanosized Target Patterns.
abstract: This work investigates experimentally the mechanism by which chemical oscillations emerge in a nanometric system. We monitor the spatiotemporal dynamics of an oscillating reaction on the surface of a nanosized three-dimensional Pt model catalyst. Using high-resolution field emission techniques, we are able to show that the oscillations are generated by nanoscale chemical target patterns of much shorter characteristic time than the period with which the oscillations occur. Our observations are made for a specific reaction system-NO_{2} reduction with hydrogen-and represent the first experimental evidence for the presence of target patterns at the nanoscale. They can be seen as an experimental demonstration of reaction-diffusion mechanisms to hold at the nanoscale as they do at the macroscale. These results shed new light on the emergence of complexity through different time and length scales.
authors.affiliation: Chemical Physics of Materials and Catalysis, Université libre de Bruxelles, CP243, 1050 Brussels, Belgium.|Interdisciplinary Center for Nonlinear Phenomena and Complex Systems (CENOLI), Université libre de Bruxelles, 1050 Brussels, Belgium.|Present address: School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Cédric
authors.initials: C
authors.lastname: Barroo
authors.affiliation: Interdisciplinary Center for Nonlinear Phenomena and Complex Systems (CENOLI), Université libre de Bruxelles, 1050 Brussels, Belgium.|Non Linear Physical Chemistry Unit, Université libre de Bruxelles, CP231, 1050 Brussels, Belgium.
authors.forename: Yannick
authors.initials: Y
authors.lastname: De Decker
authors.affiliation: Chemical Physics of Materials and Catalysis, Université libre de Bruxelles, CP243, 1050 Brussels, Belgium.|Interdisciplinary Center for Nonlinear Phenomena and Complex Systems (CENOLI), Université libre de Bruxelles, 1050 Brussels, Belgium.
authors.forename: Thierry
authors.initials: T
authors.lastname: Visart de Bocarmé
authors.affiliation: Chemical Physics of Materials and Catalysis, Université libre de Bruxelles, CP243, 1050 Brussels, Belgium.|Interdisciplinary Center for Nonlinear Phenomena and Complex Systems (CENOLI), Université libre de Bruxelles, 1050 Brussels, Belgium.|Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington 99164, USA.
authors.forename: Norbert
authors.initials: N
authors.lastname: Kruse