Structure, temporal fluctuation and vibrational spectrum of the surfactant shell of PbS nanocrystals in solution
We will investigate the organic surfactant shell's adsorption on colloidally stable semiconductor nanocrystals in toluene-d8 solution, the softness of this organic layer and its influence on the vibrational spectrum of the nanocrystals. PbS nanocrystals coated with oleic acid as the surfactant are technologically relevant for quantum dot-based solar cells and subject to long-term investigations by several research groups including our collaboration, utilizing electron microscopy, X-ray scattering, optical/NIR-spectroscopy, Raman spectroscopy, etc. We propose a combined approach using small-angle scattering (SANS), backscattering (NBS) and time-of-flight (TOF) spectroscopy on the same PbS nanocrystal solution to elucidate the dependence of the vibrational spectrum (using TOF) on the volume and dynamics of the oleic acid shell measured by SANS and NBS, respectively. This experiment becomes feasible due to the previous complimentary characterization mentioned above as well as the extremely high flux available at ILL, which is of paramount importance considering the relatively low volume fraction of the surfactant shell (approx. 1 monolayer on PbS with a diameter of 50 (±3) Å).
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SCHEELE Marcus; ANDRE Alexander; MAITI Santanu; Frank Schreiber; SCHWEINS Ralf and SEYDEL Tilo. (2017). Structure, temporal fluctuation and vibrational spectrum of the surfactant shell of PbS nanocrystals in solution. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-498
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