Simultaneous Identification of Spectral Properties and Sizes of Multiple Particles in Solution with Subnanometer Resolution

Engin Karabudak, Emre Brookes, Vladimir Lesnyak, Nikolai Gaponik, Alexander Eychmüller, Johannes Walter, Doris Segets, Wolfgang Peukert, Wendel Wohlleben, Borries Demeler, Helmut Cölfen

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)11770-11774
Number of pages5
JournalAngewandte Chemie - International Edition
Volume55
Issue number39
DOIs
StatePublished - Sep 19 2016

Keywords

  • analytical methods
  • colloids
  • nanoparticles

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Fingerprint Dive into the research topics of 'Simultaneous Identification of Spectral Properties and Sizes of Multiple Particles in Solution with Subnanometer Resolution'. Together they form a unique fingerprint.

Cite this