Free-film sample environment for containment-free in-situ observation of CdS Qdot formation
The aim of the proposal is to provide a novel, containment-free sample environment for liquid samples for neutron scattering. The setup was previously established for X-ray scattering and will be optimized for sample volumes in neutron scattering as part of an ILL summer student placement project (Ref. SPECT_8). Although the main purpose of this beamtime request is instrumental, the proposal also pursues a timely scientific goal in the field of nanoparticle formation. We wish to investige the formation of CdS nanoparticles with respect to organic ligand shells and crystallization in aqueous solution. The role and size of the organic ligand shell made of ethylenediaminetetraacetate (EDTA) in the 2.5 mM solutions shall be observed for the precursor to particle transition and requires the high flux of D11. At D16 we wish to investigate the open question when and how CdS quantum dots transform from restructured precursors to crystalline particles. To this effect, the first Bragg peak of CdS at 1.9 A-1 needs to be observed. As a future perspective the sample environment can be used for corrosive liquid samples and also in spectrometers.
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Mirijam Zobel; CRISTIGLIO Viviana; KRAUSS Sebastian; MAGERL Andreas; SCHWEINS Ralf; SEYDEL Tilo and THOMAE Sabrina. (2018). Free-film sample environment for containment-free in-situ observation of CdS Qdot formation. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-10-38
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