Simultaneous identification of spectral properties and sizes of multiple particles in solution with subnanometer resolution
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Date
2016
Authors
Karabudak, Engin
Brookes, Emre
Lesnyak, Vladimir
Gaponik, Nikolai
Eychmuller, Alexander
Walter, Johannes
Segets, Doris
Peukert, Wolfgang
Wohlleben, Wendel
Demeler, Borries
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Abstract
We report an unsurpassed solution characterization technique based on analytical ultracentrifugation, which demonstrates exceptional potential for resolving particle sizes in solution with sub-nm resolution. We achieve this improvement in resolution by simultaneously measuring UV/Vis spectra while hydrodynamically separating individual components in the mixture. By equipping an analytical ultracentrifuge with a novel multi-wavelength detector, we are adding a new spectral discovery dimension to traditional hydrodynamic characterization, and amplify the information obtained by orders of magnitude. We demonstrate the power of this technique by characterizing unpurified CdTe nanoparticle samples, avoiding tedious and often impossible purification and fractionation of nanoparticles into apparently monodisperse fractions. With this approach, we have for the first time identified the pure spectral properties and band-gap positions of discrete species present in the CdTe mixture.
Description
Accepted author manuscript
Keywords
Analytical methods , Ultracentrifuges , Analytical ultracentrifugation
Citation
Karabudak, E., Brookes, E., Lesnyak, V., Gaponik, N., Eychmuller, A., Walter, J., Segets, D., Peukert, W., Wohlleben, W., Demeler, B., & Colfen, H. (2016). Simultaneous identification of spectral properties and sizes of multiple particles in solution with subnanometer resolution. Angewandte Chemie International Edition, 55(39), 11770-11774. https://doi.org/10.1002/anie.201603844