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Degradation of Methylammonium Lead Iodide Perovskite Structures through Light and Electron Beam Driven Ion Migration.
J Phys Chem Lett
February 2016
Department of Microbial and Molecular Systems, Centre for Surface Chemistry and Catalysis, KU Leuven , B-3001 Leuven, Belgium.
Organometal halide perovskites show promising features for cost-effective application in photovoltaics. The material instability remains a major obstacle to broad application because of the poorly understood degradation pathways. Here, we apply simultaneous luminescence and electron microscopy on perovskites for the first time, allowing us to monitor in situ morphology evolution and optical properties upon perovskite degradation.
View Article and Find Full Text PDFNanoscale Study of Polymer Dynamics.
ACS Nano
January 2016
Institute for Molecules and Materials, Department of Molecular Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
The thermal motion of polymer chains in a crowded environment is anisotropic and highly confined. Whereas theoretical and experimental progress has been made, typically only indirect evidence of polymer dynamics is obtained either from scattering or mechanical response. Toward a complete understanding of the complicated polymer dynamics in crowded media such as biological cells, it is of great importance to unravel the role of heterogeneity and molecular individualism.
View Article and Find Full Text PDFA surface-bound molecule that undergoes optically biased Brownian rotation.
Nat Nanotechnol
February 2014
1] Laboratory for Photochemistry and Spectroscopy, Katholieke Universiteit Leuven, Heverlee 3001 Belgium [2] Nano-Science Center/Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark.
Developing molecular systems with functions analogous to those of macroscopic machine components, such as rotors, gyroscopes and valves, is a long-standing goal of nanotechnology. However, macroscopic analogies go only so far in predicting function in nanoscale environments, where friction dominates over inertia. In some instances, ratchet mechanisms have been used to bias the ever-present random, thermally driven (Brownian) motion and drive molecular diffusion in desired directions.
View Article and Find Full Text PDFFluorescent proteins: shine on, you crazy diamond.
J Am Chem Soc
February 2013
Department of Chemistry, University of Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium.
In this Perspective we discuss recent trends in the development and applications of fluorescent proteins. We start by providing a historical and structural perspective of their spectroscopic and structural aspects and describe how these properties have made fluorescent proteins essential as 'smart labels' for biosensing and advanced fluorescence imaging. We show that the strong link between the spectroscopic properties and protein structure and properties is a necessary element in these developments and that this dependence makes the proteins excellent model systems for a variety of fields.
View Article and Find Full Text PDFThree-dimensional visualization of defects formed during the synthesis of metal-organic frameworks: a fluorescence microscopy study.
Angew Chem Int Ed Engl
January 2013
Center for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven, Belgium.
Imperfections in the spotlight: fluorescence microscopy was used to detect defects in metal-organic frameworks formed during synthesis. In contrast to currently available techniques, confocal fluorescence microscopy offers the advantage of three-dimensional imaging at the single-crystal level combined with the sensitivity required to study the start of defect formation.
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