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@ARTICLE{Lokteva:462292,
      author       = {Lokteva, Irina and Dartsch, Michael and Dallari, Francesco
                      and Westermeier, Fabian and Walther, Michael and Grübel,
                      Gerhard and Lehmkühler, Felix},
      title        = {{R}eal-{T}ime {X}-ray {S}cattering {D}iscovers {R}ich
                      {P}hase {B}ehavior in {P}b{S} {N}anocrystal {S}uperlattices
                      during {I}n {S}itu {A}ssembly},
      journal      = {Chemistry of materials},
      volume       = {13},
      number       = {16},
      issn         = {1520-5002},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {PUBDB-2021-03326},
      pages        = {6553 – 6563},
      year         = {2021},
      abstract     = {During the self-organization of colloidal semiconductor
                      nanoparticles by solvent evaporation, nanoparticle
                      interactions are substantially determined by the organic
                      ligands covering the inorganic core. However, the influence
                      of the ligand grafting density on the assembly pathway is
                      often not considered in experiments. Here, we carry out an
                      in situ synchrotron small-angle X-ray scattering and X-ray
                      cross-correlation analysis study of the real-time assembly
                      of oleic acid-capped PbS nanocrystals at a low ligand
                      coverage of 2.7 molecules/nm2. With high temporal and
                      spatial resolution, we monitor the transitions from the
                      colloidal suspension through the solvated superlattice
                      states into the final dried superstructure. In a single in
                      situ experiment, we observe a two-dimensional hexagonal,
                      hexagonal close-packed, body-centered cubic, body-centered
                      tetragonal (with different degrees of tetragonal
                      distortion), and face-centered cubic superlattice phases.
                      Our results are compared to the self-organization of PbS
                      nanocrystals with a higher ligand coverage up to 4.5
                      molecules/nm2, revealing different assembly pathways. This
                      highlights the importance of determining the ligand coverage
                      in assembly experiments to approach a complete understanding
                      of the assembly mechanism as well as to be able to predict
                      and produce the targeted superstructures.},
      cin          = {FS-CXS / FS-PETRA-S / FS-PS},
      ddc          = {540},
      cid          = {I:(DE-H253)FS-CXS-20130727 / I:(DE-H253)FS-PETRA-S-20210408
                      / I:(DE-H253)FS-PS-20131107},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      DFG project 390715994 - EXC 2056: CUI: Advanced Imaging of
                      Matter (390715994) / DFG project 194651731 - EXC 1074:
                      Hamburger Zentrum für ultraschnelle Beobachtung (CUI):
                      Struktur, Dynamik und Kontrolle von Materie auf atomarer
                      Skala (194651731)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(GEPRIS)390715994 / G:(GEPRIS)194651731},
      experiment   = {EXP:(DE-H253)P-P10-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000691302400030},
      doi          = {10.1021/acs.chemmater.1c02159},
      url          = {https://bib-pubdb1.desy.de/record/462292},
}